erratic idle jimmy 95

[danpaz_uy]

mi idle speed goes upto 2500 rpm, mostly when the engine is hot, i clean the iac valve and works better the first day, and then happend again, then i change the iac valve, for a new one and had the same problem, any idea of what could be the problem?
i had the ses light on, and after check it, the code said high rpms idling for long time, and suggest to change the iac valve, the wich i did.
please help, thank you
my car is a gmc jimmy 95 2 doors, 4.3 vin w, thanks again for your help

[gregg565]

Originally Posted by danpaz_uy

mi idle speed goes upto 2500 rpm, mostly when the engine is hot, i clean the iac valve and works better the first day, and then happend again, then i change the iac valve, for a new one and had the same problem, any idea of what could be the problem?
i had the ses light on, and after check it, the code said high rpms idling for long time, and suggest to change the iac valve, the wich i did.
please help, thank you
my car is a gmc jimmy 95 2 doors, 4.3 vin w, thanks again for your help

sounds like map sensor (located on top of intake manifold)

[BlazerLT]

Originally Posted by danpaz_uy

mi idle speed goes upto 2500 rpm, mostly when the engine is hot, i clean the iac valve and works better the first day, and then happend again, then i change the iac valve, for a new one and had the same problem, any idea of what could be the problem?
i had the ses light on, and after check it, the code said high rpms idling for long time, and suggest to change the iac valve, the wich i did.
please help, thank you
my car is a gmc jimmy 95 2 doors, 4.3 vin w, thanks again for your help

There is no code for that.

Please tell us the EXACT code, not your interpretation of it.

[danpaz_uy]

dear blazer lt, the code is p 0507, hope this help to figure out posible cause of the problem.
the engine has 104.000 milles, and the previous owner told me he never change the cpi or the nut kit, i did change the pcv valve, and i decarbonized the engine like you thaugt us in one of your thread, i tried the sea foam, and after one complete tank of fuel, it s working a little better, but far away form normal,.Thanks in advance for your help.

[BlazerLT]

p 0507 Idle control system, idle higher than expected.

Remove the IAC valve and scrub it and the hole it inserts into with throttlebody or carb cleaner and a old toothbrush.

Then install it again, remove the negative battery terminal for 10 minutes to reset the computer.

Reconnect the negative battery terminal, start the engine and let it idle for 5 minutes so it can relearn its idle in park and then after 5 minutes get in the cab, press and hold the brake and put it into drive and hold it for 3 minutes so it can relearn the gear idle.

Then put in park. Turn the engine off. Then start it back up. Voila, it should be fixed.