Thread: what about this?? AFR prob...

My car is a B13 with a SR20VE in it, Tuned ECU with a bin downloaded from here for SR20VE, DE MAF, VE INJ and SR16 CAMS. Ok my situation is my idle afrs are from 14.3 to 16.2 up and down, but whenever i turn the A/C ON or the FANS turn on because of the temp the AFR's go directly to 10.7 and even 10.0!! what could be causing this??

- what first comes to my mind is a faulty coolant sensor? am i right??
- or something not right with the bin... i have to check the V readings also from the MAF at idle which i can check on the VAFC but i dont think is the MAF.

- Also when i installed the SR16 cams a few days ago, the friend who installed them used the consult to check what changes in the map when i turn the a/c on and nothing changed.

any info or recommendation is welcome!


Thanks in advance!

................

....helpfull responses... thats what i'll do! thanks!

iac not opening to compensate for air when the ecu is telling it to?

.....would check that too never think about that! thanks! but i'll change the coolant sensor tomorrow anyway... THANKS!

Like Forced Compression said, it sounds like the IACV / FICD is not opening.

Check this thread out:

http://www.sr20-forum.com/howtos/50162-ins-outs-stock-idle-control-system.html

im almost 100% is not that because the problem is always when i turn the a/c on or when the fans go on with the temp other than that the afrs are fine... thats why i dont think is that but i will clean and check it tommorrow

Mechanism #3) IACV/FICD (Idle Air Control Valve/Fast Idle Control Device). This is the third part of the general idle control assembly. This valve is an on/off valve used by the ECU to raise the idle when the A/C is on and/or when the power steering pressure is high (during full lock).

The fans put a pretty decent load on the alternator, i wouldn't be suprised to find that this is used to raise idle when the fans run as well.

ok i unsderstand that but the idle raise when i turn the a/c on, but a few seconds after the afrs start to go rich obviously affecting the idle, but the first thing that happens when i turn the a/c on is raise the idle so i dont think is that but anyways will check that... Thanks!

You haven't mentioned that until now.