Help! CEL P2A00 after HFC installed

gsg740 · 04-19-2013, 01:23 PM

Quote:

Originally Posted by Sh0velMan

Only thing I can guess is that the primary O2 sensor (the one in the collector of the manifold) was damaged during the TP install, causing it to read lean, prompting the ECU to add fuel.

The innovate is mounted in the TP, after the manifold, so even if there was a leak there, it wouldn't change what the ECU sees for fuel management. The post-cat sensors are just to detect catalyst function faults.

Are you able to data-log? Log the MAF voltages for both banks as well as the AFR's for both banks, while in closed loop. See if you see anything funky on the MAF side of things that might explain why it's adding fuel. Only other thing I can think of, since the intakes have to be pulled out for the HFC install, maybe something happened to the MAF sensor on that side.

I used data-logs to compare A/F ratios between Bank1 and Bank2. the data logs show Bank 1 WB A/F is constantly richer than Bank 2 WE A/F. while Bank 1 A/F adj. is around 0.36. So I think ECU must also see Bank 1 is richer.

I think the primary O2 sensor (bank 1 sensor 1) is functioning. because when ECU was reset or WOT, both Bank 1 & 2 WB AFR is nomal. However, after cuple mile bank 1 become richer and richer because ECU adding fuel on Bank 1. Voltage on both sensors are correspending with the AFR and changing rapidly.

uprev only shows one combined MAF and voltage. At least my uprev does not have any bank 1 & bank 2 option for MAF. I checked my intake 3 times already and I also tried to replaced the stock tube by Z1 post MAF tube. but the problem is still there.

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