low and erratic idle after warmup... 1jz

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thesupragod

Supramania Contributor
Apr 10, 2005
183
0
16
42
Mount Vernon, Ohio
The title pretty much says it all... After the engine warms up to operating temp when i come to stops and stuff, im getting a 300-400 rpm idle, and its not smooth. Im wondering if a sensor has gone bad, or if the idle control valve has gone bad. Just wondering if anyone else has had this problem and if so what was your solution?

Note: If put into neutral or depress the clutch pedal while driving the car sometimes stalls. Its running great otherwise w/ stock everything with the exception of exhaust and intake.


Any input would be greatly appreciated!

Jon
 
angrydrone

angrydrone

I'm a real Canadian
Mar 11, 2006
156
0
0
Ft. Worth/College Station
thesupragod;1156285 said:
The title pretty much says it all... After the engine warms up to operating temp when i come to stops and stuff, im getting a 300-400 rpm idle, and its not smooth. Im wondering if a sensor has gone bad, or if the idle control valve has gone bad. Just wondering if anyone else has had this problem and if so what was your solution?

Note: If put into neutral or depress the clutch pedal while driving the car sometimes stalls. Its running great otherwise w/ stock everything with the exception of exhaust and intake.


Any input would be greatly appreciated!

Jon
Click to expand...

That exact thing is happening to me. It runs great when cold, but once it goes to the warm mode, the idle drops. Sometimes it will idle at 700, or 500, or 400, but sometimes it will stall. I have been wondering the same thing. It is very annoying. I tried changing the idle speed control but it didn't change anything. Definitely not ruling that out yet, though. I am not sure the one I switched it with was working.

Sorry that didn't help, but just to let you know you are not alone.

Chris
 
1jzSpecial

1jzSpecial

Banned
Oct 9, 2008
25
0
0
South Florida
Sounds like the IAC valve which controls idle, it has a coolant running thru it. take it out and check the inside, if its wet with coolant where the valve opens the IAC VALVE is bad
 
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