idle air control valve

[jeepguy]

i replaced my idle air control valve and it said to adjust it to 1inch and 1/8th so i did and it seems like its doing the oppsite of what its supposed to do when i first start it it will go straight to about 700-800 RPM but once it warms up it will only idle at 1400-1600 does it just take time to wear in? or something

Topic

[jeepguy]

yes i used a spark tester and i also used a fuel pressure gage and it was in spec but the IACV when i first got it i put it straight in and didnt touch it and dove a couple days and had absolutly so changes but then i adjusted it and it got a little better but it really seems as though its working in reverse if thats even possible

[Matt]

I agree that it’s not working properly. Do you have a CEL on? You may want to try cleaning your throttle body if it’s crusted with gunk. I would definitely recheck for vacuum leaks as well.

[jeepguy]

no i dont have a check engine light on i sprayed every vacuum line and all around the intake with carb cleaner to check for leaks RPM never changed and took the throttle body off and sprayed it with throttle body cleaner and its spotless

[college man]

try using a spray bottle filled with water to search for vacuum leaks. soak all the joints.C8-)

[EricTheCarGuy]

I’m not convinced that the IAC was the problem in the first place and I think your ‘adjusting’ is actually covering up the real problem which I believe is either a vacuum leak or a fuel delivery issue. I have yet to install an IAC that I had to adjust to get it to work correctly. The other option is that you have a faulty part or perhaps a wiring issue.

[jeepguy]

i know everyone is saying vacuum leak but trust me ive dont evey test in the book to check for leaks and there are no leaks i just ruled out the cat tonight and i ordered a computer since its the only thing left to replace but what stumps me is it only has this issue during a certain time frame like if you get it hot and shut it off and wait a minute it will fire right up and if you wait like an hour it will fire right up but once you try after about 15 mins is when it has the problem but this has me stumped ive literally replaced every sensor and also what has me confused is since ive replaced all this stuff it runs better and stronger then it ever has!! it just does that wierd thing where it stalls after 15 mins

[EricTheCarGuy]

Good luck but I’m not convinced that replacing the computer is going to do anything other than lighten your wallet. So far you’ve tried replacing parts and it hasn’t solved the problem, I would suggest you take some time, learn the system, and properly diagnose it rather than continue to throw parts at it and praying that it gets fixed.

[Author]

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