Technically it's the ECU. When turned on, the A/C signal wire 'tells' the ECU to let more air through the IACV...
.Ok, Is there a direct wire that comes from theA/C going directly to the ECU?
Its because when i turn on the A/C, my idle goes down and sometimes kills the engine when idling. It means something does not compensate for idling when i turn on the A/C. If my IACV is ok and is new, maybe the wire from A/C to ECU is cut. Is this possible? Thanks very much Cautela.
On my suspected-bad FIT valve, I was able to tighten the springloaded valve 2or3 full turns. I then tested the plunger with a lighter and watched it sloooooooowly expand. It didn't move very much though. Mine never closed as much as the picture indicated. Is that enough to assume that the FIT valve is indeed failing?
Anyone can help me... I can't seem to locate the plunger (FITV) valve. I have a P73 Type R Manifold and it only has a IACV. And the IACV hole is located behind the throttle body flap in the plenum. I checked the IACV and the filter seems clean. There is a hose that goes to this part under the throttle body put it does not have the plate as mentioned by cautela dude?
Sorry I haven't been replying to this lately, here we go...
Quote:
Originally Posted by jcast
.Ok, Is there a direct wire that comes from theA/C going directly to the ECU?
Its because when i turn on the A/C, my idle goes down and sometimes kills the engine when idling. It means something does not compensate for idling when i turn on the A/C. If my IACV is ok and is new, maybe the wire from A/C to ECU is cut. Is this possible? Thanks very much Cautela.
Yes there is a wire coming from the A/C controls, namely the "A/C signal" (A/C input) wire, look it up in my 'ECU pinouts' write up (check my sig) or better yet look up a diagram that's specific for your car to locate it. Your wire is not cut because if it was, nothing would happen when you turn on the A/C system. The only other thing I can think of is that something is wrong with the ECU... check your voltages/resistances on the A/C, fuel, and ignition systems with a multimeter when you do this to see if something is wrong, also check to make sure the alternator has the proper power output.
EDIT: something just occured to me, the A/C compressor has a clutch which is also ECU controlled... if there is something wrong with THAT it may be possible that the clutch stays engaged continuously, enough that it may stall the engine... just a possibility, someone correct me if I'm wrong.
On my suspected-bad FIT valve, I was able to tighten the springloaded valve 2or3 full turns. I then tested the plunger with a lighter and watched it sloooooooowly expand. It didn't move very much though. Mine never closed as much as the picture indicated. Is that enough to assume that the FIT valve is indeed failing?
Anyone can help me... I can't seem to locate the plunger (FITV) valve. I have a P73 Type R Manifold and it only has a IACV. And the IACV hole is located behind the throttle body flap in the plenum. I checked the IACV and the filter seems clean. There is a hose that goes to this part under the throttle body put it does not have the plate as mentioned by cautela dude?
This may be due to your ECU needing retuning. Check on that first.
okay, sometimes i have high idle but sometimes I dont , Also a few time i have surging idle(when it was cooler out one night) Seems like the hotter it is the better it idles ? any comments/suggestions , I want my car to run perfect Any help is appreiated !
Also I have F22A
Every morning and after work (regardless of ambient temperature), I have surging idle until the engine comes up to operating temp (fan starts).
According to the shop manual, my FITV is failing (there is always suction from the port inside the throttle body). When my mechanic heard the surging this is also what he suggested replacing (for $377).
I already ordered a new FITV for $90 from Honda, but I'm going to try to clean the old one first.
Do you guys think this FITV is really causing the surging idle, or is this unrelated?
Is there anything else I should do while I have the FITV off (or that can be done in a short amount of time as long as I'm under the hood)?
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