Code 36 Returns-IAC and Vacuum

[BBslider001]

Hey all, I have had this pesky code return after replacing the Idle Air Control valve an fixing broken vacuum lines. I did not use and AC Delco part on the valve, but am wondering if anyone else has dealt with this? The trouble code description says "IAC, wiring, or vacuum leak". I have addressed all of those, or so I thought. I wonder if I need to get the OEM sensor and not the Standard Motor Products? The truck runs really good. I just hate that it isn't right and my CEL is back on after I got it to go off for a few days. I thought I had it licked....dangit.

 

[PlayingWithTBI]

Put a scanner on it and see if the IAC is commanded to close all the way instead of ~10+ steps. If it is, you probably still have a vacuum leak.

 

[BBslider001]

Put a scanner on it and see if the IAC is commanded to close all the way instead of ~10+ steps. If it is, you probably still have a vacuum leak.

Thanks for the input. Looks like I need to get a scanner then. I used the paper clip trick to get the code.

 

[BBslider001]

I have been looking. Anyone recommend a scanner for our trucks?

 

[1997]

Have a look at the actron cp9690 a few of us on here have them.

it does OBD 1 and 2, note it doesn’t do graphing with OBD 1

 

[BBslider001]

Have a look at the actron cp9690 a few of us on here have them.

it does OBD 1 and 2, note it doesn’t do graphing with OBD 1

Thank you much. I'll take a look.

 

[BBslider001]

I have struggled with this code to no avail. I replaced my IAC with a GM part, replaced all vacuum lines, checked for any other leaks and find none. I am about to the point of pulling the SES light LOL. It runs ok, doesn't miss or anything, and my idle speed is 800 in Drive and 1000 in Park. I figured that is high. Anyone have any ideas? This is a maddening issue and not easily fixed it seems. Funny thing is, code calls for AUXILARY IAC, which we do not have SMFH

Any input would be greatly appreciated.

 

[baxterday]

Bad TBI gasket?

 

[baxterday]

Just looking at the Actron 9690, very impressive specifications. I may just take the plunge, as we have BMW's as well as Chevrolet's. Might even work on my 93 SAAB 900s.

 

[BBslider001]

Bad TBI gasket?

Man I JUST read this today on another Internet search. I may just don't as part of my rune up list. I can't believe there aren't more threads or info on this. It doesn't seem to be all that common. If I could afford an Actron right now, I would.

Thanks for the reply!