1993 Chevy S-10 actron codes

STARBL4107

MEMBER
1993 CHEVROLET S-10
6 CYL
2WD
AUTOMATIC
148,000 MILES

I am getting the check engine light comming on intermitently. I bought an actron cp9001 and got code 35, the IAC. I replaced it and reset the computer but still get the light comming on.

Are there other definitions for code 35 using that scanner? And what would be some other possible fixes?

little info about this, it doesn't do this right away. I have to get it up to runnning temp., Then if I goto a drive up atm or get a long red light the light comes on but goes off withing seconds of getting going. Also I have seen if I drop it to neutral when the light comes on and pump the gas afor a bit the light goes out.
so I am unsure if it is overheating or if it is with air intake

3 Replies

JNOVACK

MECHANIC
723 POSTS

One tip on the Idle Air system on GM's - some need to have a special reset on that part to clear the code. On the 1980-1990's GM's the procedure was to drive the car at a speed exceeding 50 mph for a minimum of five minutes, continuous. You will need to make sure the car stays above 50 for the full five minutes. Make sure to find a nice stretch of open highway where the legal speed will let you do this. This will cause the computer to push the idle air system wide open, then fully closed, to check it over the whole range. After this you can clear the codes and the code should not come back.

If it does, cleaning of the intake may help, since dirt in the passages can affect this system also.