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Idle Speed Controller

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Twinturbo120

10+ Year Contributor
475
24
Aug 14, 2010
Miami, Florida
Well I've searched and google searched but my question is still unanswered. My car's idle is pretty bad. When I turn on the A/C it goes to like 700 RPMs and back to 1000. Even with the A/C off it still idles pretty bad. I know this is the ISC but I also have white/grey smoke. This smoke only appears after the car has warmed up a bit. I'd say ~5mins or less.

When I go WOT my friend said there was no smoke. But when I idle there is smoke. Can this be caused by the ISC as well? Or can this be a bad turbo seal,valve cover,valve stem seal,headgasket? :banghead: I have yet to do a compression and leak down test. The guy that I bought it from calms that it's the ISC. What do you guys think?
 
Well I've searched and google searched but my question is still unanswered. My car's idle is pretty bad. When I turn on the A/C it goes to like 700 RPMs and back to 1000. Even with the A/C off it still idles pretty bad. I know this is the ISC but I also have white/grey smoke. This smoke only appears after the car has warmed up a bit. I'd say ~5mins or less.

When I go WOT my friend said there was no smoke. But when I idle there is smoke. Can this be caused by the ISC as well? Or can this be a bad turbo seal,valve cover,valve stem seal,headgasket? :banghead: I have yet to do a compression and leak down test. The guy that I bought it from calms that it's the ISC. What do you guys think?

Could be a number of things. Can you elaborate on idle is bad? Like is it inconsistent like jumping up and down, or idling high or low?
 
Could be a number of things. Can you elaborate on idle is bad? Like is it inconsistent like jumping up and down, or idling high or low?

Yeah It's inconsistent, like it goes from 800 to 1000 then back down. Sometimes it goes as low as 600 back to 900. Very inconsistent.
 
Have you tested the coils on your ICS?

DmTaLoN's Idle Speed Control Test/Fix Page!
Idle Surge FAQ

The smoke you are seeing at idle, white indicates coolant, blue is oil and black/gray is fuel.

Any CELs or boost leak tests done? Curious to see if the EGR is leaking.

No CEL, haven't done the boost leak test yet. So I have coolant and fuel leaking somewhere?

*UPDATE* Just to mess around, I turned on the car today to smell the exhaust. It smells bad. Coolant is suppose to smell sweet not bad.
It smells more like a burnt oil sorta thing. Like a weedeater smells like.

*UPDATE 2* Disconnected the intake piping to the turbo. Hehe....There's oil in there. That's not good is it?
 
Last edited:
oil in the intake piping could be either bad or normal. do ytou have a catch can on your valve cover going to the intake ### my car had Major oil from that usually a catch can or a $3*without tax* fram fuel filter can fix the issue it did for me but I still have smoke I'm a little color blind and can't tell the difference between the white, light blue, and black/grey smoke
 
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