Reasons for high idle

[lost240soul]

so i just bought a 90 s13 ans it idles realli hi ...first idles normal than 1500 and now 2000 rpm ..any 1 have any idea

[Neejay]

check for vacuum leaks.

What ideas have come up in your research of the problem?

[lost240soul]

ok...i didnt really notice until now i have only had the car for like 3 days... the only think i can think of maybe something to do with the MAF sensor

[4bangers]

check your IACV to see if it clog up. another thing is you could adjust your idle rpm by turning the screw on the IACV. that's what I did with my s13. But also make sure you didn't have a head gasket leak. good luck

[lost240soul]

how would i check the iacv

[Neejay]

how would i check the iacv
Use the Search function and search for a FSM (you can type "s13 FSM" as the search string.)

Also use the Search to find out "how to check IACV". There's a lot of threads with the correct info.

[lost240soul]

ahh thank u much... i figured it out... the guy that had my car before used a home depot screw were the idle screw went and it just kept moving down...