Help with powerlogger readings

[Robjob]

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.

[Steve Wood]

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

[Robjob]

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.

[Robjob]

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

[TexasT]

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?

[Robjob]

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.

[daveismissing]

I diodn't  think there were new MAFS only remans and many of those don't work.

[Steve Wood]

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 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?

[Scoobum]

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 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.

[Steve Wood]

Right now, I don't see a maf be problem be if his  boost is 8 psi

[Steve Wood]

I'm not sure that's detonation either for that matter

[Steve Wood]

the one thing that looks funny to me is the O2 seems too low at any point

[Robjob]

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.

[Steve Wood]

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.