Very Rich on Little to No Boost

[crvogt]

Hi there,

Looking for any opinions on what might be happening.

Issue:
Getting into any boost (0-5psi) car AFR tanks to high 9s, low 10s. I would do a 3rd gear pull, but not sure what the effects of "super rich" will be. AFR generally seems good under low load.

Checked/Verified:
Fuel pressure rises 1:1 with boost.
MAF settings.
Coolant temp > 160F when recording for PL

I've attached a log file and screenshot, just to show how quick at low throttle AFR dips.

Thanks

 

[EricM]

Your MAF readings look too high.
I know you said you verified the MAF Translator settings, but lets look at it again.
Could also be a bad MAF. Do you have a blow-off valve? Sometimes those can stay open, causing problems.

 

[crvogt]

Your MAF readings look too high.
I know you said you verified the MAF Translator settings, but lets look at it again.
Could also be a bad MAF. Do you have a blow-off valve? Sometimes those can stay open, causing problems.

Thanks for the response! The translator looks correct (I believe).

I don't have a blow-off valve, but do have an adjustable waste gate actuator. I followed the RJC instructions for setting the boost controller and rod length.

Would you suggest trying another MAF? (EDIT: I forgot I have my original MAF, I'll stick that on and see what difference it makes)

 

[EricM]

I would try a new MAF. Can you get the part# on your current MAF to confirm its the LT1 3"?

 

[crvogt]

I would try a new MAF. Can you get the part# on your current MAF to confirm its the LT1 3"?

I threw on the stock MAF, and that did seem to resolve the problem, at least the AFR looks much better under boost. Can you confirm?

I had purchased the MAF from Highway Stars with the translator. The number on the MAF is Delphi AF10055. I looked it up but I'm struggling to confirm with the part number that it is specifically the "3in LT1" MAF.

 

[EricM]

Yes, that looks more normal. The AF10055 is the 3" LT1 sensor.

 

[crvogt]

Yes, that looks more normal. The AF10055 is the 3" LT1 sensor.

I ordered a new MAF (bought from you actually) to the same results. Car runs great on stock MAF, way too rich on the new, new MAF. Could it be a "bad" translator?

 

[EricM]

Anything is possible. If you send it to me, I can check it out.

 

[crvogt]

Anything is possible. If you send it to me, I can check it out.

That would be awesome, thanks! I'll send it to the contact form address with a return label and if you send me a PM I can pay you for your time.