Random misfire/ Throttle going crazy!!
Senior Member
Joined: 04-07-2014
Posts: 505
From: San Diego
Mine did that when I cleaned the throttle body. The throttle plate moved positions from where it was. It goes away with time. The car starts to relearn where the throttle plate is. You can try the relearn process for the throttle body. The dealer can do the relearn process instantly though.
Administrator
Joined: 10-13-2011
Posts: 40,082
From: Welland,Ont Canada
I’m thinking they are all new! The HHR isn’t the only GM that has this learning problem!
A SCAN II reader programmer is required, maybe they don’t read our forum?
you might try a full battery lobotomy, very simple, just disconnect the negative terminal on the battery, back in the spare tire well.
A full 30 minutes to reset the computers. It’s worth a try!
your troubles arose from those guys not disconnecting the battery when they put in the throttle body, and possibly the mechanic moving the butterfly manually.
A SCAN II reader programmer is required, maybe they don’t read our forum?
you might try a full battery lobotomy, very simple, just disconnect the negative terminal on the battery, back in the spare tire well.
A full 30 minutes to reset the computers. It’s worth a try!
your troubles arose from those guys not disconnecting the battery when they put in the throttle body, and possibly the mechanic moving the butterfly manually.
Senior Member
Joined: 04-07-2014
Posts: 505
From: San Diego
There you go, donbrew for the win!
I don’t have the proper dealer scan tool, but I performed the manual relearn a few times and even though it got better it would still do some odd rpm fluctuations for a while until it learned them out.
P.S. I disconnected the battery when I removed and cleaned the throttle body, mine just seemed to act up afterwards. The relearn process was the only way for me.
I don’t have the proper dealer scan tool, but I performed the manual relearn a few times and even though it got better it would still do some odd rpm fluctuations for a while until it learned them out.
P.S. I disconnected the battery when I removed and cleaned the throttle body, mine just seemed to act up afterwards. The relearn process was the only way for me.
Moderator
Joined: 01-23-2009
Posts: 26,532
From: Fredericksburg,VA
And then, we have the suspicion that this shop is a bunch of guys wearing size 34 shoes (they are clowns), and may have botched the throttle install. When I switched throttle bodies I had no problem at all after the first 1 minute idling.
Thread Starter
New Member
Joined: 11-09-2018
Posts: 12
From: Arkansas
Yeah, I am out $900.00 and the car is still screwed up, thanks chevy dealership. My luck is so bad, I can find the only Chevy dealership, who doesn't know how to work on Chevy's. Not a talent I hope to hold on to. The car is at a small "mom and pop" shop now, so it will probably get fixed right this time.
Moderator
Joined: 01-23-2009
Posts: 26,532
From: Fredericksburg,VA
The technicians go to the same trade schools. They don't teach deductive reasoning, they teach them to read what the scanner says not how to interpret what it says.
I still don't understand paying that much money for no results. I would have asked for guarantees that the parts they threw at it would fix it. They can only charge so much for "diagnostics". Even if it is an electrical problem there are only 4 wires to check. I got no idea how replacing the throttle body was supposed to fix it.
A brand new throttle body from GM is about $300 plus 30 minutes labor. There was no indication the part was bad, just a stupid guess.
You still have not told us how you know there was a "random misfire".
I still don't understand paying that much money for no results. I would have asked for guarantees that the parts they threw at it would fix it. They can only charge so much for "diagnostics". Even if it is an electrical problem there are only 4 wires to check. I got no idea how replacing the throttle body was supposed to fix it.
A brand new throttle body from GM is about $300 plus 30 minutes labor. There was no indication the part was bad, just a stupid guess.
You still have not told us how you know there was a "random misfire".
