i put up a post awhile ago about how bad my idle is...its fine when you first start it (obviously just a lil high at like 1.2k rpms til it gets warmed up) ...but once it gets like half-way warmed up its VERY,VERY lumpy....well now its hott out and today i noticed that my idle was perfect...like 800 rpms, wasnt movin at all...so im like wtf?, and i noticed i had my AC on...so i turned it off, went bad to complete shit again...i did this like prob 4-5 times just to make sure it wasnt a coincidence...its been 2 the mechanics and he said he coudlnt find any vac. or exhaust leaks, and all the sensors seemed to be working fine...lol but hes also a mechanic and we all know how they are, and he also said he thinks it would be internal and its 165$ just to take it apart and look....so thats a lil sketchy, so im tryin 2 figure this out on here or my own (which prob wont happen lol)....whats every1 think?

Check the IAC. When the AC turns on the ECU will kick open the valve letting a little more air past the throttle plate to compensate for the energy the AC compressor sinks from the crankshaft.

2016 WRX STi Limited (current)
2001 A4 1.8tqms (donated)
1991 GVR4 #1933 (sold)
old.dsmregistry.com/detail.php?carid=218 (dismantled)

well that would explain why the rpms go up and stay at a constant level...but it doesnt explain why the rpms are lumpy and jump up and down (lower than 800) to begin with....thanks tho i didnt know that


Mods: Doesnt really matter b/c unless i go turbo, i can RUN faster than my car

well i replaced the IAC, same problem...would it have anything to do with the air intake temperature?....i dunno what to even look for...so far i replaced the IAC, checked the TPS, and fixed the only vacuum leak i could find...any more ideas?

Mods: Doesnt really matter b/c unless i go turbo, i can RUN faster than my car

Try replacing the CTS (coolant temp sensor) its only a $7 dollar sensor and it seems to be related to many quirky problems.

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alright ill try that once i get some money..down to 3 bucks in my wallet b/c of this car lol..and didnt even fix nething

Mods: Doesnt really matter b/c unless i go turbo, i can RUN faster than my car

hey, i have the same prob. but my idle is too high. ac brings it down to a 1000... i have a jeep tb on it tho... gosh. this car has so many problems.

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well thats kind of the opposite of mine then if the idle is high lol..mine was high a few days ago when i got a leak where the TB meets the intake mani, but i fixed that...i just cant figure out why the AC makes the car idle good..it stays relatively in the same rpms, just like 10x smoother...can some1 explain 2 me exactly what happens when the AC turns on?

Mods: Doesnt really matter b/c unless i go turbo, i can RUN faster than my car