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Tech Area => General Buick Tech => Topic started by: Big Dawg on September 18 2020, 11:22:49 AM

Title: 1985 Grand National will not start.
Post by: Big Dawg on September 18 2020, 11:22:49 AM
Hi everyone,

Okay here goes. I picked up my 85 Grand National after sitting for over 16 years.

I knew the gas tank and fuel lines needed to either get replaced or cleaned out. So i went ahead and replaced the Gas tank and fuel sender/pump with the Spectra replacements. I cleaned out the fuel line and return lines as well and replaced the fuel filter. I primed and it and got all the air out of the system and had fresh clean fuel at the rails and shrader valve.

After doing all this the car still did not fire up, just cranked and turned over.

So I decided to do a spark plug and spark plug wire replacement along with an oil filter and oil change. I even took the coil pack off and did the ohm meter test and all the ohms were between 11.2 - 11.6. I watched a YouTube video that a member on the site did where he tested the coil pack with the ohm meter and thats what I did. I just don't know if it would be different ohm numbers between a 85 and 87 GN.

After this the car still did not fire up....so i went ahead and changed out the O2 sensor  and air filter and cleaned out the MAF sensor with CRC Sensorcleen. And also changed out the Crank position sensor last night.

The car still hasn't fired up. I am a bit stumped on what to check or look for next.

I have ordered a 86-87 coil pack and ignition module along with the 86-87 hotwire adaptor from Caspers and will be upgrading the i85 gnition system next.

Also I have checked all the fuses and they all are in working order, I also hooked up a OBD1 reader and did not see any error codes at all.

I notice the oil/choke light is almost always lit up on the dash along with the check engine light when I am trying to fire it up.

Anyone know what else I am missing? Or take a look at to narrow this issue down?

Thanks a bunch guys.
Title: Re: 1985 Grand National will not start.
Post by: nocooler on September 18 2020, 11:29:27 AM
Are the injectors spraying fuel? 
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on September 18 2020, 12:07:34 PM
Are the injectors spraying fuel?

Totally slipped my mind to even check the injectors.  What is the easiest way to check? Take themnoff the manifold whole still plugged into the harness? Or unplug them and get them tested at a shop?

Thanks
Title: Re: 1985 Grand National will not start.
Post by: Steve Wood on September 18 2020, 12:19:24 PM
Okay, I have never worked on a hot air car, but, in reality, all cars work the same.

From my site, here is a link to Jimmy Testa's troubleshootin g procedure.

http://www.vortexbuicks-etc.com/jim_testa.htm

now, to determine if you have spark, you can use a spark tester inserted between the plug wire and the plug and crank it over to see if there is spark showing.  Or, cheap guys like me, pull a plug wire off, connect it to a spark plug and lay the plug on the valve cover so it grounds it, and crank it over while watching the electrode on the plug to see if a spark is jumping the gap.

At that point, if you have spark, you can pull the hose off the throttlebody and spray some carb cleaner into the intake thru the throttlebody, and see if it fires and tries to run.

If you did not have spark, you have to fix that problem first.

If you did have spark and it does try to run when you spray carb cleaner or starting fluid into it.  You need to check and see if you have injector pulse by using a NOID light-they are cheap to buy.

One of the common problems on cars that have been sitting for a long time is that the injectors stick closed.  If that happens, they will not spray fuel and the car will not start.
Some times you can hold something like an extension to the base of each injector and tap it lightly with a hammer a few times.  Do all of them.  It may run after doing that.  On the other hand, the injectors need to be cleaned or better, replaced.

If the noid light is not showing a blink...then you gotta figure that out.

Here is a link that I have on my site for trouble shooting hot airs.

http://www.vortexbuicks-etc.com/8485_trouble_shooting.htm
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on September 18 2020, 12:28:19 PM
Thank you very much for this Steve!
Title: Re: 1985 Grand National will not start.
Post by: Steve Wood on September 18 2020, 12:31:57 PM
My pleasure.  We will help you try to sort it out. :)
Title: Re: 1985 Grand National will not start.
Post by: nocooler on September 18 2020, 01:41:53 PM
Hot-air cars make the passenger side injectors a pita to get to. Start with the ones you can see!

Title: Re: 1985 Grand National will not start.
Post by: Forzfed on September 18 2020, 02:22:41 PM
Listen to Steve!  But I am willing to bet those injectors are plugged solid or seized!

Hot-air cars make the passenger side injectors a pita to get to. Start with the ones you can see!

I've changed the injectors a couple times on my 85.  I think I pulled the turbo, so long ago I can remember for sure. :hmm
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on September 18 2020, 03:21:37 PM
Hey guys,

Some good news........i lightly tapped the injectors on the Drivers side with an extension and hammer and tried starting the car up and right away it sounded like it was trying to fire up, I cranked it over about a dozen times and than tapped the injectors and than 2 on the passenger side under the turbo and it actually started up for a few seconds. Wish you could have seen the smile on my face.....espec ially on my kids faces.....my son is 11 and is a total car fanatic.  He already told his sister that he is going to drive the car to grad, and that she can drive my 442.

I am thinking I am going to take the turbo off and have it looked over and possibly rebuilt, and try to find a local shop here to see if i am able to get the injectors cleaned. I may just order a set of replacements.

Can anyone tell me if I should keep the stock injectors or get some higher lb/hr injectors??? Also does anyone have the specs of the stock injectors for an 85?

Thanks alot guys.
Title: Re: 1985 Grand National will not start.
Post by: Forzfed on September 18 2020, 05:04:19 PM
Upgrade the injectors for sure!  If you are going to rebuild the turbo think about upgrading it to a TA-33, basically a little bit bigger compressor wheel that will work really good with a stock combo.
Title: Re: 1985 Grand National will not start.
Post by: Steve Wood on September 18 2020, 06:44:06 PM
Amazing what one can do with a hammer, huh!? :D

I would agree on the injectors.  You will need a new chip to match them.  Check with Eric Marshall of TurboTweak for both injectors and the chip.
Title: Re: 1985 Grand National will not start.
Post by: nocooler on September 18 2020, 06:50:41 PM
Before we go down the rabbit hole. Know that the hot air cars are the bastard child in the buick world - they don't get much love.
Now is the time to decide what you want to do with the car and build it appropriately that way you aren't spending money twice. I'm not up to date on chips but they are pretty limited for the hot-air ecm, but you can upgrade to the 86/87 computer to open up some options.
Title: Re: 1985 Grand National will not start.
Post by: Scoobum on September 18 2020, 09:34:17 PM
Here's the injector chart...number s will be on the injector.

http://users.erols.com/srweiss/tableifc.htm (http://users.erols.com/srweiss/tableifc.htm)
Title: Re: 1985 Grand National will not start.
Post by: Scoobum on September 18 2020, 10:25:14 PM
Reading from Erics forum, you can swap in an 86-87 ECM and use Powerlogger. He also recommends swapping out to an LT1 MAF and Translator. And I'd grab his street chip, if the car doesn't have one. Stock injectors are 28 lb.
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on September 19 2020, 11:55:09 PM
Reading from Erics forum, you can swap in an 86-87 ECM and use Powerlogger. He also recommends swapping out to an LT1 MAF and Translator. And I'd grab his street chip, if the car doesn't have one. Stock injectors are 28 lb.

Okay Thank you fir the info,

I was actually thinking of ordering the 37lb injectors from racetronix, but am still unsure. The 86-87 ECM idea is a great idea as well.....man i,m a bit confused. Are there 86-87 ECM's being sold on the site often?
Title: Re: 1985 Grand National will not start.
Post by: Scoobum on September 20 2020, 07:23:03 PM
Stock ECM's are a dime a dozen. Go to my Youtube channel. I show how to mod it for PL.
Title: Re: 1985 Grand National will not start.
Post by: daveismissing on September 20 2020, 07:23:53 PM
The 60lb Seimens Deka are big -yet well characterized injectors. I would buy once
Title: Re: 1985 Grand National will not start.
Post by: Forzfed on September 20 2020, 08:44:36 PM
Reading from Erics forum, you can swap in an 86-87 ECM and use Powerlogger. He also recommends swapping out to an LT1 MAF and Translator. And I'd grab his street chip, if the car doesn't have one. Stock injectors are 28 lb.

Okay Thank you fir the info,

I was actually thinking of ordering the 37lb injectors from racetronix, but am still unsure. The 86-87 ECM idea is a great idea as well.....man i,m a bit confused. Are there 86-87 ECM's being sold on the site often?

Unless things have changed the biggest injector would be the 32 lbs for a stock 85 ECM.  If you convert to the 86/87 you can have your choice.  All depends on how much money you want to spend.  I would suggest an alky kit.
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on September 20 2020, 10:55:17 PM
Stock ECM's are a dime a dozen. Go to my Youtube channel. I show how to mod it for PL.

What's your youtube channel, thanks
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on September 21 2020, 03:54:01 AM
Stock ECM's are a dime a dozen. Go to my Youtube channel. I show how to mod it for PL.

You are right, they are all over Ebay.....are the ECM #1227148 from the 86/87 Century, or Oldsmobile,  98, all an option for the GN ECM swap?? Or does the ECM have to be from GN/Regal?

Thanks
Title: Re: 1985 Grand National will not start.
Post by: Steve Wood on September 21 2020, 08:40:35 AM
Any with that part number
Title: Re: 1985 Grand National will not start.
Post by: ULYCYC on September 21 2020, 11:10:25 AM
Correct any #1227148 will work. Only problem, I doubt they will come with the correct Calpac chip you will need. You will have to find  GM pn#16036503 or 16036504 as both are discontinued.  I haven't messed with ecms in a long time so Im not sure if they bypassed the calpac when they modify the ecm for injectors or powerloggers.  Good question for Eric or Steve Wood
Title: Re: 1985 Grand National will not start.
Post by: Steve Wood on September 21 2020, 11:20:22 AM
I thought they ran okay without the calpac but Eric is the guy for the absolute answer.

I think the problem with the calpac was that when larger injectors were used, the engine would be flooded badly with fuel.  Calpac required tps and ignition pulses from the module to let the engine barely run.  If the cal pac was not in the computer, the car would not start.  I think Eric removed the requirement of having one installed but, like I said, ask Eric to get the straight info.  He's a very nice guy.
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on September 22 2020, 03:25:50 AM
I thought they ran okay without the calpac but Eric is the guy for the absolute answer.

I think the problem with the calpac was that when larger injectors were used, the engine would be flooded badly with fuel.  Calpac required tps and ignition pulses from the module to let the engine barely run.  If the cal pac was not in the computer, the car would not start.  I think Eric removed the requirement of having one installed but, like I said, ask Eric to get the straight info.  He's a very nice guy.

Okay, I will send him a message on his site.

Thank you
Title: Re: 1985 Grand National will not start.
Post by: nocooler on September 22 2020, 02:51:07 PM
The last hotair I converted to an 86/87 ecm drove really nice. I did 3 in total. Every one ran noticeably better. These days skip the oem maf and go with the translator setup. If you don't know the status of the fuel pump, now is the time to replace it and make sure it's hot-wired. Also, pay close attention to the ground and positive battery cables if they are questionable replace them. I don't know if you can still get an adapter but changing to the later style ignition module and coil pack is nice as there are more replacement parts.  
Title: Re: 1985 Grand National will not start.
Post by: daveismissing on September 22 2020, 10:15:01 PM
Has anyone actually had the ECM go into limp mode? I think you can run without one, you just an error code.
Title: Re: 1985 Grand National will not start.
Post by: Steve Wood on September 22 2020, 10:41:19 PM
I have back in 86.  I don't believe the car will start without one in the factory config.  But, I think Eric removed that feature somewhere down the line so the car will run with, or without, one.
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on October 05 2020, 12:37:11 PM
Hey guys,

Here is an update,

I did a full brake job on the car and replaced the v-belts. Also did the ignition module upgrade to the 86-87 setup, man what a difference!!

I have the car running now, pretty smooth idle, took it for a drive with my son and it has some "get up and go".

I bought an ECM for $75, from ebay out of an 86 olds , 1227148.

Now I went on to the the TurboTweak site and it states on there that Eric will not be shipping international as some packaged recently have gone missing. So i guess I will wait to get a chip burnt for my setup.

My question is if I get a street chip and 60lb injectors, can the chip be tuned to run the injectors at a lower rate until I get the cars turbo upgraded, hopefully to a TA33C (very hard to locate).

Also i would need the lt1 or ls1 MAF and a Maf rranslator correct?

Thanks for all your help so far guys!!!

Am
Title: Re: 1985 Grand National will not start.
Post by: Steve Wood on October 05 2020, 02:47:31 PM
did you ask Eric if he considers Canada as international?
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on October 07 2020, 12:56:14 AM
did you ask Eric if he considers Canada as international?

Hi Steve,

I have emailed Eric, just waiting for a reply.

Thanks
Title: Re: 1985 Grand National will not start.
Post by: Scoobum on October 07 2020, 09:17:13 AM
I should have been more specific when I said stock ECM's are a dime a dozen. I meant ECM's for 86-87 TR's. E-mail Eric again and ask him about the ECM you purchased and the part number. That ECM may not work correctly for our cars. You can run any size injector you want...think Eric goes up to 160's. Ask him if you can run a Translator with the hot air car engines...if it's a go...then an LT1 will be fine.
Title: Re: 1985 Grand National will not start.
Post by: Steve Wood on October 07 2020, 09:21:54 AM
Quote from: Big Dawg
Quote from: Steve Wood on October 05 2020, 01:47:31 PM (http://www.ihadav8.com/forum/index.php?topic=6529.msg93447#msg93447)did you ask Eric if he considers Canada as international?
Hi Steve,

I have emailed Eric, just waiting for a reply.

Thanks
If he does not, I will be happy to remail it to you if there is not one closer :)
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on October 07 2020, 01:43:26 PM
Quote from: Big Dawg
Quote from: Steve Wood on October 05 2020, 01:47:31 PM (http://www.ihadav8.com/forum/index.php?topic=6529.msg93447#msg93447)did you ask Eric if he considers Canada as international?
Hi Steve,

I have emailed Eric, just waiting for a reply.

Thanks
If he does not, I will be happy to remail it to you if there is not one closer :)
[

Thank you!



quote author=Scoobum link=topic=6529.msg93464#msg93464 date=1602076633]
I should have been more specific when I said stock ECM's are a dime a dozen. I meant ECM's for 86-87 TR's. E-mail Eric again and ask him about the ECM you purchased and the part number. That ECM may not work correctly for our cars. You can run any size injector you want...think Eric goes up to 160's. Ask him if you can run a Translator with the hot air car engines...if it's a go...then an LT1 will be fine.
[/quote]

Okay Thanks!
Title: Re: 1985 Grand National will not start.
Post by: daveismissing on October 07 2020, 06:40:11 PM
1227148 should be the correct ECM for 86-87s.
Title: Re: 1985 Grand National will not start.
Post by: Scoobum on October 07 2020, 08:09:02 PM
Upon further review Eric goes to 120's.
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on October 16 2020, 01:07:08 AM
Hi guys,

Finally got a response from Eric @TT. He is shipping to Canada now through UPS.

I met a guy through Kijiji selling a tonne of 87 Grand National Parts, and have got my hands on (2)87 GN ECM's with stock chips and a few performance Chips, a complete power antenna setup and powemaster Brake setup with accumulator, a complete Coil pack and Ignition module (which will be a backup) and a OEM 87 MAF, and a complete uncut 87 GN Harness( hopefully one day I can get my hands on 86-87 Intercooled motor setup).

Once I get the 87 ECM, MAF and IAT/MAT setup, I will be getting a street Chip burnt by Eric, he said it would be a good idea to put 60lb injectors innit as well, but he will tune it for my Hot Air setup.

Anyone know who is a reputable Turbo source that still has TA33C turbos for sale?

My main goal is to have my car Insured with Collector Plates  In BC and than hopefully start making it go fast.

Thanks for all your help guys.
Title: Re: 1985 Grand National will not start.
Post by: Scoobum on October 16 2020, 08:02:58 AM
Tell him to ship it USPS...not UPS. You'll get raped at the door by UPS for all their extra charges. They'll be more than the cost of the chip.

And forget about going fast.
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on October 20 2020, 03:48:11 PM
Hi guys,

I got all my parts from a guy out in Charlottetown, I got (2) 87 ECM #1227148 with 3 chips, one of them looks to be the stock chip ATH7584,  but I got these 2 other chips, one is a turbo tweak chip and one looks to be a ADS Superchip. Just wonderingnif anyone could tell me a little bit more about these chips. I attached a couple of pictures as well.

I got a stock 87 MAF as well, I picked up a stock IAT/MAT SENSOR  as well,  i have a question now in regards to the placement of this sensor. Should it be between the MAF and Filter or between the MAF and the throttle body?

Once the ECM swap is done, I can hook up a scan master and powerlogger correct?

Thanks guys
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on October 20 2020, 03:51:41 PM
Here are a couple of pics of the car,

Title: Re: 1985 Grand National will not start.
Post by: Steve Wood on October 20 2020, 06:08:39 PM
The TT chip goes with stock 28 # injectors.  The chip has to match the injector size.  The other two chips are obsolete by today's standards and could be dangerous as they may have too much timing.

The IAT sensor normally goes between the filter and the maf.  Some times when spraying alky, we put it between the intercooler and the throttlebody with TT alky chips.  Some times, we don't :)

Don't count on the maf being any good if it is a factory one.  Most of them have long since died.  Your scantool will tell you.

Yes, SM, PL should work with the 86/87 ecms along with the rest of the conversion.
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on October 20 2020, 06:14:48 PM
The TT chip goes with stock 28 # injectors.  The chip has to match the injector size.  The other two chips are obsolete by today's standards and could be dangerous as they may have too much timing.

The IAT sensor normally goes between the filter and the maf.  Some times when spraying alky, we put it between the intercooler and the throttlebody with TT alky chips.  Some times, we don't :)

Don't count on the maf being any good if it is a factory one.  Most of them have long since died.  Your scantool will tell you.

Yes, SM, PL should work with the 86/87 ecms along with the rest of the conversion.

Thank.you so much!

My stock injectors are 28lbs, so the TT chip should work?

Even the ath7584 is obsolete? Is that not a stock chip?
Title: Re: 1985 Grand National will not start.
Post by: nocooler on October 20 2020, 06:44:18 PM
Stock injectors are 28# - it should start with that chip - ask Eric if it'll work for your combo. 
By obsolete - Steve means don't use them with today's gasoline. 
Title: Re: 1985 Grand National will not start.
Post by: Scoobum on October 20 2020, 06:49:06 PM
Contact Eric...he'll have a file of that chip and can tell you exactly what it was burned for. The number he needs is 8460...send him that pic of it as well. Chip is for 28 pound injectors and 91 octane. You'll need to know from Eric what size turbo it was burned for...as that's how he sets his fueling. If you have 28 pound injectors...yo u can plug that chip in and it'll work. No WOT shit tho...till you hear back from Eric. Throw the others in the garbage.

PL and SM will work with the 86-87 ECM...but double check with Eric.
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on October 20 2020, 10:03:34 PM
Hey guys,

I had emailed Eric and got a reply back......

"The 8460 chip is for an all stock 86/87 car.  It may work ok on your 85 car, but the boost may be too high, unless you adjust it manually.  Also, that chip would need the IAT sensor, or it will throw a code.   The chips I make for the 85 car with the 86/87 ECM have the IAT disabled."

What is the difference in boost between the stock hot air 85 GN and the intercooled 86 87 GN??

Also how would you manually adjust boost on the hot air cars?

Thanks
Title: Re: 1985 Grand National will not start.
Post by: Scoobum on October 21 2020, 07:58:05 AM
From a personal standpoint, I'd have Eric burn a chip for exactly what you have. Changing head gaskets...suck s. Having a chip for exactly what you have and your goals eliminates fueling issues...as long as your fuel system is up to the task. Fueling is the number one thing guys don't pay attention too.
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on July 23 2021, 07:30:04 PM
Hey everyone, longtime. Hope everyone is staying safe out there. I got the GN rolling and have submitted my paperwork to see if I can get some Collector Plates for Insurance here in Beautiful British Columbia.

I have done a few more things to the car, original 87 wheels, and Black Grill. I have collected all the parts needed to do the injector and ECM swap as well as TT chip from Eric.

I have a small issue with the car now, I took off my turbo and replaced it with rebuilt stock 85 turbo I got my hands on from Calgary. Changed out the PCV and grommet ( after dropping into the intake, and fishing it out with scope). I changed out all the vaccum.lines and o-rings as well.

Now when I go to start it, its revving at like 2200-2500 rpm, and only falls to 900 - 1000 rpm when nine reverse and drive. The second its in neutral or park it jumps up again. Can I adjust the small screw on the throttle body that faces up? Also my turbo boost gauge lights up 5 orange lines and nothing more on dash. Which vaccum line controls the boost meter on the dash?

Thanks for or all your help guys. :powersix:
Title: Re: 1985 Grand National will not start.
Post by: Steve Wood on July 23 2021, 09:05:15 PM
Have you searched for a large vacuum leak?  PCV not connected?  I don't know anything about the hot airs but it sounds like something is open and allowing a lot of air to come in
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on July 24 2021, 01:33:33 AM
I will double check in the morning, I replaced the PCV and grommet and used clamps on both ends of the vaccum line.  Thanks...will let you know what I find.
Title: Re: 1985 Grand National will not start.
Post by: Steve Wood on July 24 2021, 09:34:17 AM
Just seems like something like a large leak would cause.  Does a hot air have an IAC and is plugged in?
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on July 24 2021, 08:10:04 PM
Just seems like something like a large leak would cause.  Does a hot air have an IAC and is plugged in?

Hi Steve, yes it has a IAC And a TPS sensor. I removed them from the old setup and swapped them over to the rebuilt setup.  So I put Corbin clamps and a couple heavy duty clamps where needed on all the vaccum hoses. I also decided to measure how far the idle screw measured vs the one that came with the rebuilt turbo and it was about 1.5 mm off of the screw on the one I pulled off the car, I adjusted it Counter clock wise about 2 turns until it was almost the same as the original and it fired up at about 900 rpms and no codes of any type were thrown. I took it for another drive and the boost gauge works as it should now. I just have to play with adjustable arm to get the boost just right.

After removing the turbo and reinstalling it with next to no issues, I'm thinking I'm going to upgrade the ECM, TT chip, injectors and get the scanmaster and Maf all installed pretty quick here. With my rebuilt turbo I was also given a 3 inch elbow housing and 3 inch downpipe as well. One day I will get it setup with the 3 inch exhaust.


I must say being the GN is my first Turbo car, its been very educational.

Thanks for all your help.
Title: Re: 1985 Grand National will not start.
Post by: nocooler on July 24 2021, 08:27:31 PM
If you moved over the IAC/TPS did you set them correctly?
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on July 24 2021, 08:37:40 PM
If you moved over the IAC/TPS did you set them correctly?

I am presuming i did as I never played with TPS calibration, the IAC sensor was just plug and play. From what I read on all the forums in regards to the adjustment of the idle screw is if you adjust the idle screw than you must recalibrate the TPS. The measurements from the bottom of the housing of the idle screw to the top of the actual screw was 27.4mm, the measurement on the rebuilt setup was 26.6mm, I adjust the screw identical to what the screw on the old throttle Jbody housing was set to, the screw adjusts the throttle body blade.

I am going to take it for a drive when it cools down outside and see how everything goes. I hope to get the scanmaster setup soon, than I will be able to pull the numbers off of that.

Thanks Am
Title: Re: 1985 Grand National will not start.
Post by: nocooler on July 24 2021, 08:53:46 PM
You can use a voltmeter and paper clips to check the tps voltage. The IAC needs to be within certain parameters as well. All the 86/87 info applies here. If you took off the turbo and throttle body did you reset the TV cable for the transmission? 
Title: Re: 1985 Grand National will not start.
Post by: Steve Wood on July 24 2021, 08:55:48 PM
take your volt meter and see what the tps is reading with the engine off and the Ignition ON.  I think it should be close to 0.45 v similar to the later cars.
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on July 24 2021, 09:18:58 PM
You can use a voltmeter and paper clips to check the tps voltage. The IAC needs to be within certain parameters as well. All the 86/87 info applies here. If you took off the turbo and throttle body did you reset the TV cable for the transmission?

I have never done this before, is there a thread or video that shows how to do this? I have voltmeter handy.

I just unclipped the TV cable along with the other 2 that were on the bracket. The lengths and placements did not change between the 2 setups.
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on July 24 2021, 09:21:38 PM
take your volt meter and see what the tps is reading with the engine off and the Ignition ON.  I think it should be close to 0.45 v similar to the later cars.

I will do this as soon as I figure out how to do this.
Title: Re: 1985 Grand National will not start.
Post by: Steve Wood on July 24 2021, 09:24:35 PM
meter on volts, ground probe on a ground, probe each of the three terminals.  One will be a ground and you will get 0, one will be about 5v, and one should be about 0.45 if I am right.  They are in a different order than an IC car so you will just have to probe
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on July 24 2021, 09:53:23 PM
meter on volts, ground probe on a ground, probe each of the three terminals.  One will be a ground and you will get 0, one will be about 5v, and one should be about 0.45 if I am right.  They are in a different order than an IC car so you will just have to probe

Steve, When you say probe each of the three terminals, you mean  the pigtail end or leave it plugged into the sensor, and probe from the top of each wire with a paper clip? With the ignition on , but not started correct?
Title: Re: 1985 Grand National will not start.
Post by: Big Dawg on July 24 2021, 10:31:48 PM
Okay, I figured out what you meant.

It was 0 on ground, 5V, and .42. I turned the screw and now am at .45....with the RPMs at about 950- 1000 now.

Does this look correct?

 

Title: Re: 1985 Grand National will not start.
Post by: Steve Wood on July 25 2021, 12:04:45 AM
yeah,, it really should not have made any difference as the window is pretty wide.  Have you tried disconnecting the orange battery wire assuming it has one? Disconnect it for 15 seconds or so to reset the ecm
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