After doing tons of searching and finding no one with a problem like mine, i am forced to post this.

I'm having issues with my car idleing with the A/C on. It idles fine with no E/L and idles fine with E/L. But if i turn the A/C on it drops to 500 rpms and wants to die when i stop. The A/C idle adjustment in the power fc has no affect on the idle. I can drop it to the lowest RPM and it does not change, i can take it to the highest and it does not change. I talked to Rotary Performance and they say that there is other ways to adjust the idle in the power FC.

I can adjust the idle with no E/L using the commander. And i can adjust the idle with E/L using the commander.
But when i try to adjust the idle A/C with the A/C on , it has no affect.


Now, i'm thinking that i'm getting too rich at idle with a load on it like the A/C. Has any one seen this problem? I'm thinking that my Idle control valve is workin just fine because i can adjust the other settings fine. When the ECU tells the car to idle at a certain RPM and you turn the A/C on , does it use the same signal to idle the car up? or does it have a seperate signal that it sends to the idle control valve? Thank you, Russell

 

the ac will kill/bog a car with low compression. assuming yours is ok disconnect the white spade connector power lead to the compressor and let the car idle. now turn on the ac and see if the idle changes. it should go up quite a bit. if not maybe the iac is not working correctly, doubtful as you can adjust it other times, or the pfc is not seeing the ac as switched on.

 

Hrm I'm having this problem with the stock ecu. I thought it was bad compression but I did a compression test and compression is fine. (90's all around, on each rotor face and on both rotors) Did you check your plugs? My plugs seem to get fouled within 3 days and but when the plug are new I have no idle problems at all. However the vacuum with the A/C on is less than 5 in gear. I'm thinking it could be the A/C compressor is bad or going bad or perhaps my ignition coils are not providing enough spark because they are going bad... who knows. Anyone have any ideas or suggestions?

 

People have had this problem and replaced the clutch pressure switch. Everything was fine after that. Ask scratchjunkie. He had that problem. He even has the part number. I think it was something like 10 bucks.

 

I will try that, thanks.

 

for me it was 2 things:

1. the TPS that was slightly out of range on voltage - check the advanced tech section on a thread by damian about how to adjust. you can view the range on the commander under the etc menu.

2. the PowerFC needed to go through the full idle relearn procedure. do a search on a thread by TomsR1 where clayne posted the how to on that.

I'd try that before spending the money on parts.

 

I tried that and the idle did change a very little bit. I was also able to adjust the A/C idle with the powerFc with the connector off. I've noticed that what i have the idle set at by the power FC, is atleast 100 rpms higher than what the car idles at. I also hooked you the stock ECU to see is it would still do it , and it seemed to idle about 600 rpms. I'm thinking it is not ECU related now.

 

I will check on that tonight when its not so hot outside. Thank you...Russell