Alright guys...I've got my wide band in and I'm running 10.1 A/F at idle (that's as low as my wideband goes!)! 12.5 - 13.0 at WOT (or mostly WOT). If I add an AFPR to adjust the fuel pressure at idle will this fix my problem?
I'm not too up to date on what an AFPR can do but I understand the basics of it. Guess my question is if I adjust the AFPR for idle...will that affect my A/Fs at WOT or at other times?
I have a CEL ever 5 cycles for a misfire and it's got to be the high A/Fs at idle as I won't get the misfire untill I'm sitting at a light or stopped in traffic...all at idle speed. Under throttle or normal driving everything works fine. The car puddles fuel I think at idle and it idles rough as well.
The part # I have for AEI-13107 for the ecotec. Can any one confirm this as well (it's an Aeromitive AFPR).
Thanks.
Eh...old man with a Corvette now...it was bound to happen sooner rather than later right?
Hey , have u asked mr aaron about this , and im pretty sure it would be a good idea to get one , i know he had to use his a couple times to tune it in just right ..
I dont know maybe its just me but ...everyone with ur style SC kit . wit hthe reflash makes it runs like @!#$.
Good luck with it tho, let me know if u get an answer , i would also like to know .
Hrmmm 10:1 at idle?!
something is off bud
Deron, I was just about to email you. @!#$, I gotta do my AFPR but its too cold out. Ill try and get it done in the morning and let you know what happens. I find it extremely strange that we both have 10:1 at idle. We both have 12-13 at boost. And we both have lag! I have a feeling we got the same issue and hopefully the AFPR fixes it.
Ill let you know asap
Sam...thanks!
Aaron...yeah something is off but I'm not sure what?
More to come I hope and we'll see what happens....
Eh...old man with a Corvette now...it was bound to happen sooner rather than later right?
What are the coolant temperatures at when you are at idle and what are the ambient air temps as well? Reason I ask this is because (A) you definently should not be that rich at idle (B) You shouldnt be that lean under WOT with the reflash assuming you have the stock pulley.
Do you know if your vehicle is in closed loop or not?
Do not try to lower your fuel pressure any less than what you are or you will be WAY too lean at WOT. That is if you are using a regular AFPR. If you are using a boost activated rising rate then nevermind. Seeing that you are talking of the Aeromotive that many of us use i again assume you will not have a pressure activated rising rate AFPR. To answer your question though YES if you lower your pressure at idle to lean out to 14.7 you will severly effect your WOT A/Fs also to a LEAN condition. With the reflash you should have nearly perfect 14.7:1 at idle though regardless of what fuel pressures you set it at because the PCM will compensate PW to make up for low pressures and your adjusting will show up only under load and WOT. The only other time you would see A/Fs such that you describe would be under cold startups. System will go into Open loop and dump fuel to warm up your coolant and cat which brings me to the first two questions I had for you. If the coolant does not warm up sufficiently it will stay in open loop causing a rich condition. If the cat isnt heating up to become active then the downstream O2 will show it not working and again the PCM will try to heat it with the introduction of more fuel.
Would also help to know what your STFT and LTFT readings are to better figure out what is happening. There are many other things that can cause your guys problems but we need to make a basis to start with.
ASE Master Certified Automotive Technician
CaliforniaDomestics wrote:What are the coolant temperatures at when you are at idle and what are the ambient air temps as well? Reason I ask this is because (A) you definently should not be that rich at idle (B) You shouldnt be that lean under WOT with the reflash assuming you have the stock pulley.
Do you know if your vehicle is in closed loop or not?
Would also help to know what your STFT and LTFT readings are to better figure out what is happening. There are many other things that can cause your guys problems but we need to make a basis to start with.
Thanks for the indepth post!!
I'll have to run the car on the data logger to get the information this weekend to get the ambient air temps. The intake temps hav ebeen as high as 230 before I added the CAI and the new exhaust system (header, cat and full exhaust)...so I'll have to run it again to see where it is now. Also...I use to get a CEL every two cycles now it's every 5 cycles. Same thing though...random misfire. I'm running NGK7s gapped at .34.
The coolant temps at idle are anywhere form 195 - 210. I have flushed the coolant system and that has helped as the car doesn't run hot like it use too...it was always above 210 from the time it warmed up!! The fan ran constantly before the flush and fill but now it runs after I turn the car off...every time!
I have Autoenginuity for a data logger and I can't remember seeing if the car is in open or closed loop...don't think it tells me?
Give me some insight to STFT and LTFT please. I do not know these?
Again, thanks for the insightful post!
Edited 2 time(s). Last edited Thursday, April 12, 2007 1:18 PM
Eh...old man with a Corvette now...it was bound to happen sooner rather than later right?
