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What is ISV?and how do ifind the vacum leak? - Cars & Trucks

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Hi Noel:
First thing is to check for air leaks. There is a metal pipe that goes around the back of the engine to the side of the block by the Distributor. This is on top of the valve cover. It is a silver cylinder with two black hoses going to it and a electrical connection. Remove the hoses and electrical connector. Just use some carb cleaner and spray in the valve from each direction where the hoses attached.

Make sure you dont have any split vacuum or crankcase hoses. This will casue a big vacuum leak and bad idle.

Next thing is the idle air screw on the throttle body take it out and count the turns so you can put it back in the same spot. There is an o-ring that breaks and causes an air leak. The Idle Stabilizer Valve (ISV) could be dirity and may need to be cleaned.

Also, keep in mind that the headgasket may have an affect on the idle if it is affecting the compression.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Posted on Feb 24, 2012

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