long story short, I had my car running, went and opened the passengers door to put something in and when I closed it the idle raised from about 750 to about 1000-1100 for a few seconds, then went back down. I did this 6 times with different waiting intervals between doing it to make sure it was actually from the door. It definitely was, without a doubt. I thought it was very strange and didn't have time to check it out right then, but when I got back in the drivers seat I noticed my check engine light disappeared, while the car was running. I went up the street and the car ran much better, it was running right. I had posted a thread recently about a remaned maf, I have not been able to switch them yet but while all this happened it had that same remand maf on it, so IM thinking it may be ok after all

The codes I got were 32 and 41.

I am guessing it is a short somewhere, guessing near the computer (computer is above the passengers feet on the left, above courtesy light correct?) But IM just looking for any other ideas.

Where is the computers ground located?

Thanks in advance

 

damn funny!! but seriously, don't put your faith in a re-man MAF. let me guess, you got it from auto zone. don't worry too much about the code 32. but the code 41 should be looked at.

 

I got it from advance auto, but same difference really haha. It was definitely surprising to find this though, I laughed about it but at the same time this means I'll be chasing wires later... Do you know where the ground for the comp is?

 

Bolted to the back of the cylinder head(s). They are known to come loose and cause issues.

Code 41 is a cylinder select error, most likely the ECM is bad. Pull it down, start the engine, and rap on the ECM with your knuckles. If how the engine is running changes, or the SES turns on, bad ECM.

RBob.

 

Thanks rbob, great info. I tried this and tried a few other things and when I tapped the top left of the back of the ecm and it raised the idle once, I tried all over it and even in the same area and didn't get anythingagain. However I pulled the access plate off to get to the prom aha I noticed if I pushed down on the prom the ses light would go off, the idle would raise up temporarily, then the ses light would come back on and idle go back down. I also noticed the ecm had been switched before, our has written on it in market that it was off an 88 s10 with the 2.5.

It is fairly intermittent, but the ses light is on, and when I am able to affect it the light goes off and out runs better

is it safe to say it is the prom? Ecu?

 

It is most likely the ECM that is bad. Also, if there is a cork cube on the top of the MEMCAL, remove it. BE sure to keep the MEMCAL for the replacement ECM if you need to turn in the current one as a core.

As far as it being a bad MEMCAL, it could be. But it is rare that there is a connectivity issue with them. Pop it out of the socket and re-insert it, then test again.

For additional testing you can take the full cover off and see which areas of the board are sensitive to pressure. If there is a section far from the MEMCAL, then more likely it is the ECM.

RBob.