HHR SS missing hesitate when using tune
Thread Starter
Member
Joined: 03-04-2013
Posts: 50
From: WPB FL
HHR SS missing hesitate when using tune
This just started a week ago, when i select the tune button it chugs pops then takes off as normal. Another issue is 50% of the time you step on it the boost stays low, then if you feather it up and down with the throttle it finally jumps up to 20lbs. Few times i got blow off valve error but most of the time no errors. With the tune off no problems.
Senior Member
Joined: 06-07-2011
Posts: 2,180
From: SE Mich
Mine did stuff like this after my HG repair. It was the intake plumbing on the charged side. Look it over. I had both water ingestion and leak issues. Either can create this symptom. The engine is expecting more boost than it receives...
Thread Starter
Member
Joined: 03-04-2013
Posts: 50
From: WPB FL
HHR SS misfire
I have an issue only when the Trifecta-Tune is engaged. when i floor it with the tune on it starts popping missing badly, not always, but most of the time now. If i move the accelerator back and forth i can sometimes get it to stop missing and go. Cant figure it out maybe the computer? i get an error on occasion when this happens of cylinder 4 misfires. I use to get error for the Turbo blowoff but i replaced it with a high quality one now the error is number 4 cylinder misfire. Keep in mind none of this happens with the tune off, even if i floor it. I re-programmed the ECU with the tune again to make sure it was not a data corruption issue.
Thread Starter
Member
Joined: 03-04-2013
Posts: 50
From: WPB FL
HHR SS Misfire
Ok i changed coils packs, injectors, checked for turbo leaks and i still have bad misfire above half throttle. Below half throttle runs fine. I have a fuel pressure gauge on the low side in the car that reads normal during acceleration> Im at a loss , ECU ? Ignition box ? Sometime error on cylinder 4 misfire. Valves look caked. But i really do not want to remove the exhaust manifold, turbo etc to do the walnut thing
