Got it. Now let the digesting begin.

 

Preliminary review shows the left O2 sensor readings appear to be more rational. Both sides are now pulling out fuel at idle.... 8.6% on the left bank and 13.3% on the right bank... to keep it from running rich.

The MAF reading looks a bit higher than I am used to. I'd expect 6 - 8 GPS at idle, you are at ~9.5 GPS. A high MAF reading causes the PCM to add more fuel. If the MAF calibration is off, your fuel is off. If the MAF is reading higher than actual air flow, it's going to run rich, and the PCM will have to pull fuel to correct. That's just one possible explanation. High fuel pressure would be another. Or oversize injectors.

I'll spend more time on it later.

 

Injectors are stock and originals. I've relocated the IAT to the K&N CAI ahead of the MAF. Would this have any impact on the readings? I let the programmer know about the relocation but I have no idea if any adjustment was made or if any needs to be made.

Car is definitely running better. I'm in the process of using up a tank of gas that sat for a year while the car was parked and running Seafoam through it.

 

Bad gas can cause A/F ratio problems. Who knows what sea foam does.

Relocated IAT will not cause problems.

I would still check the fuel pressure, and the fuel pressure regulator vacuum line.

 

Is there any fuel additive that you put stock in?

 

Chevron Techron

 

Yeah, I've always respected Techron as a good product.