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Tech Area => General Buick Tech => Topic started by: Robjob on February 02 2018, 08:29:15 PM

Title: Help with powerlogger readings
Post by: Robjob on February 02 2018, 08:29:15 PM
Does someone see something I don't trying to figure out why Im getting knock. The only thing see is maybe the tps. I don't know let me know what you think
Title: Re: Help with powerlogger readings
Post by: Steve Wood on February 02 2018, 09:21:27 PM
I don't see any data on that file for some reason...
Title: Re: Help with powerlogger readings
Post by: Robjob on February 02 2018, 10:05:34 PM
I tried to add it it said the file was to large I’ll try again
Title: Re: Help with powerlogger readings
Post by: Steve Wood on February 02 2018, 10:39:47 PM
you may have to make a smaller file...seems like bob added an option to cut a piece out of the file to make a smaller one, but, i may be wrong
Title: Re: Help with powerlogger readings
Post by: Robjob on February 02 2018, 11:01:57 PM
It finally posted on the first post
Title: Re: Help with powerlogger readings
Post by: Scoobum on February 03 2018, 07:21:13 AM
I don't see any data on that file for some reason...

Yeah...there's no data there Steve.
Title: Re: Help with powerlogger readings
Post by: Robjob on February 03 2018, 09:43:53 AM
I hope this is it
Title: Re: Help with powerlogger readings
Post by: Robjob on February 03 2018, 10:08:49 AM
i don't know what is going on but  i'm going to have to end this thread until I figure it out I will start another one soon.
Title: Re: Help with powerlogger readings
Post by: TexasT on February 03 2018, 10:53:00 AM
Are you able to see the data on your saved files? You know, after you save and reopen them. Are you renaming the files?
Title: Re: Help with powerlogger readings
Post by: Robjob on February 03 2018, 12:13:10 PM
I am able to see the data on my pl. No I’m not reanaming them.
Title: Re: Help with powerlogger readings
Post by: Scoobum on February 03 2018, 02:32:29 PM
Still no data showing.
Title: Re: Help with powerlogger readings
Post by: Steve Wood on February 03 2018, 04:59:38 PM
What are your o2s reading where you see the knock. Does the knock continue until you lift off the gas, or does it abruptly start and then go away if your foot is still in it?
Title: Re: Help with powerlogger readings
Post by: nocooler on February 03 2018, 06:40:39 PM
Put the file in Dropbox and share the link.
Title: Re: Help with powerlogger readings
Post by: Robjob on February 03 2018, 08:44:54 PM
The o2’s were .768. At the time the knock count was 6 and knock retard was 4.8. The maf read 178.3 at 7.9 boost. My tps was at 2.74 and the mph was 50. The knock starts and won’t go away until I lift.
Title: Re: Help with powerlogger readings
Post by: Scoobum on February 04 2018, 12:58:26 AM
50 mph at part throttle with the 02's at 768 I'd say the fuel pump is fukd. PL file would sure help tho.
Title: Re: Help with powerlogger readings
Post by: Steve Wood on February 04 2018, 08:44:41 AM
That is my first thought as well. Did you check the fuel pressure?
Title: Re: Help with powerlogger readings
Post by: Scoobum on February 04 2018, 08:57:04 AM
That is my first thought as well. Did you check the fuel pressure?

It's gotten to the point I'm telling guys to install an in car fuel pressure gauge.
Title: Re: Help with powerlogger readings
Post by: Robjob on February 04 2018, 11:42:08 AM
The fuel pump, I will hook up the fuel gauge and take it for a run and find out. I just put 80lb injectors in. The boost is at 8lbs. So. I should be around 51lbs at wide open throttle right? Is there anything else I should look out for. In the frame with the knock at wot the tps was at 2.74 should I be worried about that.
Title: Re: Help with powerlogger readings
Post by: TexasT on February 04 2018, 11:56:46 AM
Have you checked the tps at no throttle and wot with eoff/keyon? 2.74 isn't where id want the wot tps reading.
Title: Re: Help with powerlogger readings
Post by: reality on February 04 2018, 12:08:07 PM
http://www.vortexbuicks-etc.com/


Title: Re: Help with powerlogger readings
Post by: Scoobum on February 04 2018, 01:13:40 PM
BLM's at idle with the engine warmed up. Steve and I are guessing at the fuel pump...that's why Steve's asking for fuel pressure. Fuel pressure should be no less than 1 for 1 with boost.
Title: Re: Help with powerlogger readings
Post by: Robjob on February 04 2018, 01:29:02 PM
Ok I’m going to check in about an hour or so and post the results
Title: Re: Help with powerlogger readings
Post by: TexasT on February 04 2018, 01:44:07 PM
Static(with vac hose off) +boost = needed fp if the pump is keeping up. Another thing that threw me was the maf gr/sec reading. At wot a stocker should go to 255.and i think an upgrade maf w/translator should go to 255 unless you have some thing more fancy.
Title: Re: Help with powerlogger readings
Post by: Scoobum on February 04 2018, 02:58:44 PM
You should be worried about knock...period .
Title: Re: Help with powerlogger readings
Post by: Steve Wood on February 04 2018, 03:42:53 PM
The maf will not go to 255 at 7 psi. It takes around 17 psi on a stock set up to reach 255 g/s

The ECM ignores tps IF the ecm has commanded PE which is determined by LV8 which is set by the chip maker.  I would go thru the process of setting it to whatever your chip maker specifies so it will be able to be programmed.
Title: Re: Help with powerlogger readings
Post by: TexasT on February 04 2018, 03:46:05 PM
I'm pretty sure I'm getting 255 and I'm thinking I'm only around 14psi. Tt chip and 42lb injectors. Maybe that makes it different.
Title: Re: Help with powerlogger readings
Post by: Steve Wood on February 04 2018, 03:50:13 PM
TT has an automatic lock on at a certain point, that may have something to do with it.
Title: Re: Help with powerlogger readings
Post by: Steve Wood on February 04 2018, 04:04:00 PM
If he had 7.8 psi at 178, then 14 psi would appear to be 240 gps...which sounds about right to me and that should lock into wot on Eric's chip...IF, I am doing the math right...that's a really big IF lol

If the PL file is showing PE ticked on the data page, it should be fueling correctly-again I think


Title: Re: Help with powerlogger readings
Post by: motorhead on February 04 2018, 06:21:19 PM
Oh good... you found your way here.  Follow the direction you are given given to the letter - and I am certain it will work out.
Title: Re: Help with powerlogger readings
Post by: good2win22 on February 04 2018, 09:55:14 PM
Rob, where are you located?  May have someone close to you that may be willing to meet up to help get the base numbers dialed in
Title: Re: Help with powerlogger readings
Post by: Robjob on February 04 2018, 11:20:56 PM
I’m in California I did a run earlier and the fuel pressure was down a little bit. I turned it up, but it’s still doin the same thing. I’m still working on trying to get the logs posted, I have a cousin who is very computer literate and will be working on this issue tomorrow.
Title: Re: Help with powerlogger readings
Post by: Steve Wood on February 05 2018, 09:28:45 AM
right now, it seems we are having difficulty loading pictures so I suspect the same problem applies to files.  Hopefully, it will be fixed shortly
Title: Re: Help with powerlogger readings
Post by: Robjob on February 05 2018, 06:42:55 PM
I also tried to load a pic of the pl screen and it wouldn’t let me yesterday. I will try to upload again in a couple of hours and if it doesn’t work I will try again tomorrow.
Title: Re: Help with powerlogger readings
Post by: Robjob on February 06 2018, 08:49:48 PM
For some reason Im able to post the log on Eric's site. If you guys want to see it its up there now at turbotweak. Its under all topics, titled knock at 8-10 lbs
Title: Re: Help with powerlogger readings
Post by: TexasT on February 15 2018, 10:43:22 AM
http://www.turbotweak.com/forum/index.php?threads/knock-at-8-10lbs-trying-to-diagnose-thru-powerlogger.2796/ (http://www.turbotweak.com/forum/index.php?threads/knock-at-8-10lbs-trying-to-diagnose-thru-powerlogger.2796/)

I looked at the logs .008 and .013. What are you using for a MAF? I still don't like the tps numbers.
Eric states "Throttle position voltage. Keep it around .42-.44 throttle closed, and 4.4-4.6 wide open throttle (WOT)." and you are in the .38v range at no throttle and I am seeing much less than the 4.4-4.6 unless you aren't going wot with those logged runs.

DO you have a fuel pressure gauge to attach to the fuel rail and tape the gauge to the windshield to make sure you are getting the fp to rise with the boost? Are you using an upgraded fuel pump and hot wire kit of some sort to supply that pump with the electricity it needs to perform?
Title: Re: Help with powerlogger readings
Post by: Robjob on February 15 2018, 12:11:30 PM
Hi and thanks for looking at the log and bringing it over. Yes I do have a fuel pressure gauge. When I looked at the fuel it was about 2lbs low so I adjusted it up. After doing this it still showed knock at around 8 lbs. The fuel reading gets up to about 52 lbs under wot. However it won’t go past this and that’s when the knocking starts. I have a walbero pump and yes it’s hot wired. In the log when the knocking was the worst I should have been in wot. The maf is a stock ACDelco unit brand new as of a few weeks ago.
Title: Re: Help with powerlogger readings
Post by: daveismissing on February 15 2018, 12:56:48 PM
I diodn't  think there were new MAFS only remans and many of those don't work.
Title: Re: Help with powerlogger readings
Post by: Steve Wood on February 15 2018, 02:05:34 PM
Your idle tps is within the specified factory window show it should be fine.

Your wot tps is low.  It is high enuf to allow Power Enrichment, however, so it should be allowing the ecm to give the proper fueling, but, it is not high enuf to allow the chip to be programmed if you want to change anything.  Now you say that it seems okay?  So let's get it sorted out.  Be sure that the floor mat is not stopping it from going down all the way.  Be sure the throttle valve cable is adjusted properly.  If it is set too tight, then the throttle blade will not open all the way.  Also be sure the accelerator pedal is not stretched so much that the  throttle blade is not going to full wide open..or within a few degrees of that.

With the key on and the engine off, what does it show at wide open throttle?

Go thru this section   for the tps setting  http://www.vortexbuicks-etc.com/basics.htm#Throttle (http://www.vortexbuicks-etc.com/basics.htm#Throttle) Position Sensor Adjustment

Now, do you have a 2 bar map sensor, or a three bar map sensor?

You are using a mechanical fuel pressure gauge or is it a digital sensor?

Is this the original factory maf replacement or is it is a translator set up with a modern maf?
Title: Re: Help with powerlogger readings
Post by: Scoobum on February 15 2018, 04:26:38 PM
Your idle tps is within the specified factory window show it should be fine.

Your wot tps is low.  It is high enuf to allow Power Enrichment, however, so it should be allowing the ecm to give the proper fueling, but, it is not high enuf to allow the chip to be programmed if you want to change anything.  Now you say that it seems okay?  So let's get it sorted out.  Be sure that the floor mat is not stopping it from going down all the way.  Be sure the throttle valve cable is adjusted properly.  If it is set too tight, then the throttle blade will not open all the way.  Also be sure the accelerator pedal is not stretched so much that the  throttle blade is not going to full wide open..or within a few degrees of that.

With the key on and the engine off, what does it show at wide open throttle?

Go thru this section   for the tps setting  http://www.vortexbuicks-etc.com/basics.htm#Throttle (http://www.vortexbuicks-etc.com/basics.htm#Throttle) Position Sensor Adjustment

Now, do you have a 2 bar map sensor, or a three bar map sensor?

You are using a mechanical fuel pressure gauge or is it a digital sensor?

Is this the original factory maf replacement or is it is a translator set up with a modern maf?

Steve...he's got a new stock AC Delco MAF.
Title: Re: Help with powerlogger readings
Post by: Steve Wood on February 15 2018, 05:42:02 PM
Right now, I don't see a maf be problem be if his  boost is 8 psi
Title: Re: Help with powerlogger readings
Post by: Steve Wood on February 15 2018, 05:44:48 PM
I'm not sure that's detonation either for that matter :D
Title: Re: Help with powerlogger readings
Post by: Steve Wood on February 15 2018, 05:52:25 PM
the one thing that looks funny to me is the O2 seems too low at any point
Title: Re: Help with powerlogger readings
Post by: Robjob on February 15 2018, 07:39:16 PM
Figured I shave a few pounds and still keep the factory look so first thing I did was take the floor mats out. I have a 2bar map sensor right now. The fuel gauge is mechanical and the maf is new as of a few weeks ago. With the car on engine off pedal to the ground tps reads 4.2 ish 4.3 range the last time I checked. I never really checked the throttle cable or the accelerator pedal. I will do this as there is still a little day light out here and go back and check the tps again as well.
Title: Re: Help with powerlogger readings
Post by: Steve Wood on February 15 2018, 08:33:07 PM
You don't appear to be pushing the pedal all the way down during your testing :)

If all checks out, try increasing your fuel pressure to about 49 psi at idle with the hose disconnected from the regulator. The reconnect it, and make a run.
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