IHADAV8.com - Turbo Buick Tech, and Nonsense
Tech Area => General Buick Tech => Topic started by: Robjob on February 02 2018, 08:29:15 PM
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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
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I don't see any data on that file for some reason...
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I tried to add it it said the file was to large I’ll try again
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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
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It finally posted on the first post
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I don't see any data on that file for some reason...
Yeah...there's no data there Steve.
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I hope this is it
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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.
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Are you able to see the data on your saved files? You know, after you save and reopen them. Are you renaming the files?
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I am able to see the data on my pl. No I’m not reanaming them.
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Still no data showing.
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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?
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Put the file in Dropbox and share the link.
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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.
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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.
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That is my first thought as well. Did you check the fuel pressure?
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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.
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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.
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Have you checked the tps at no throttle and wot with eoff/keyon? 2.74 isn't where id want the wot tps reading.
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http://www.vortexbuicks-etc.com/
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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.
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Ok I’m going to check in about an hour or so and post the results
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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.
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You should be worried about knock...period .
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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.
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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.
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TT has an automatic lock on at a certain point, that may have something to do with it.
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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
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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.
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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
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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.
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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
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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.
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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
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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?
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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.
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I diodn't think there were new MAFS only remans and many of those don't work.
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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?
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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.
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Right now, I don't see a maf be problem be if his boost is 8 psi
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I'm not sure that's detonation either for that matter :D
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the one thing that looks funny to me is the O2 seems too low at any point
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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.
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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.