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Check Engine light IAC ?


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7 replies to this topic

#1 kmpdx

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Posted 25 April 2018 - 06:40 PM

Hey guys,

My car was surging when warming up and last time I fixed this by changing the IAC. I realized that when I took off the old IAC that it was dirty. It passed the tests so I think that probably that was the problem. So to clean the current valve I soaked it in some isopropyl. I left it in the sun a while to dry and then I put everything back together. The car would not start at first and then after cranking and giving a little gas it started. The CEL came on and stayed on regardless of reset battery. Engine is runnig a little rough and not sure what it does cold because it hasn't cooled down enough to see what the cold idle is.

 

Do you think alcohol was still in the controller part of the IAC and burned it out? Or maybe it just needs more time to evaporate? 

 

Can't really think of what else it could be.

 

Thanks,

 

kmpdx



#2 DaveT

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Posted 25 April 2018 - 06:54 PM

I don't think alcohol would bother it. It has to deal with fuel etc.

The CTS can fail and cause all kinds of idle and starting problems.

Read the blinks on the led on the ECU under the steering column. You have to remove the plastic panel to see it.

#3 kmpdx

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Posted 25 April 2018 - 07:30 PM

There is no power on the IAC harness...
Going to try to figure that out first.

#4 kmpdx

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Posted 25 April 2018 - 07:36 PM

Harness wire is broken!

#5 kmpdx

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Posted 25 April 2018 - 07:36 PM

Harness wire is broken!

#6 DaveT

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Posted 25 April 2018 - 08:25 PM

That will do it.  No idle when that wire is open.  I had one do that.



#7 kmpdx

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Posted 25 April 2018 - 09:23 PM

Thanks DaveT. I should have done basic troubleshooting before posting. All fixed now and better than before.

#8 DaveT

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Posted 25 April 2018 - 09:33 PM

Not a problem, there are lots of things that can go wrong - it helps to hear about what are common failures to save time.






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