I did a seafoam treatment early this morning then drove all over town came home car ran great. went to girlfriends house and drove the other car and came home cranked up the disco and at idle it was running around 2500 for solid 10 min. As soon as i put it in gear it drops to normal RPMs. Put it in park right back up. also cleaned the MAF.

Walter

 

What Seafoam treatment did you do?
The induction cleaning or in the gas tank?

 

induction

 

I'm not real bright, so I'll speculate and you guys yell at me.

If the induction cleaning causes the idle to stumble, (the ECU doesn't understand), will the ECU try to compensate for lower rpm by opening the IAC?

Will the feedback loop on the IAC tell the ECU "I'm wide open you idiot"?

Will the ECU say "screw off" (not literally)

I'm just wondering if there's any correlation with induction cleaning, not holding it to 2000rpm during and the IAC not cooperating afterwards.


luck,greg

 

Sounds like you have a vacuum leak, double check the hose you used for the induction cleaning and make sure it is on tight.

 

The only thing that should happen when doing the induction cleaning is the engine will get flooded and will stumble and set off the check engine light.

When you do the induction cleaning you let the truck idle and do it with a warm engine.

 

I did mine several years ago, as I recall, I fed the seafoam, with throttle open, shut it down for 5mins or so, restarted, then drove away from my house as fast as I could.

(yea, it smoked) I drove down the freeway, nobody tailgated.

luck,greg

 

yea i did the same thing. there will be no mosquitoes in my yard!!!

 

EVER!!

luck,greg

 

Check for a vacuum leak as Spike mentioned and also clean your t/body and IAC, both of which will cause high idle issues.