High idle

Hi Mando76,

Have you done anything with the idle air control valve? I attached the diagnostic procedure for you to review.

Also, it normally fails the test for high emissions not just high idle. However, if it is above 1,000 RPM it may not even start the test. So in essence it "fails" the test. I just want to make sure we are clear why it is not passing.

The only reason we need to be clear is because the IAC is not going to fix any high emissions issues.

Thanks

Okay. That is good information. It still could be the IAC however, it is more likely something that is causing your hydrocarbons to be high at idle.

Take a look at the attachment. This will walk you through the most likely causes.

However, my experience on these older vehicles is you have a vacuum leak somewhere and it is causing it to be a little rich at idle.

Here is a guide that will walk you through vacuum leak issues:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

If you don't find any vacuum leaks then walk through the possible causes on the attachment. If you need information on how to test some of these, let me know.

If you have a read out from the test, just post it to the site and I can take a look at it.

Thanks

You are welcome. I will wait to hear back. Thanks