I bought an 04 impala ss back in October. It was not running. Blown head gasket and the owner had everything torn apart. So I pulled the engine. Sent the head to the machine shop. They came back good according to them. I put it all back together and installed it into the car.
It started right up. But idled rough, once it warmed up the rpms got worse and would shut off. On restart the rpm jumped from around 1200 to 400 until it shut off again.
When I installed the engine I put New spark plugs, new wires, new air filter, new fuel filter. After I got the p0300 code I put a new fuel pump swapped ICM and coils off of a known working car. I also swapped the cat, MAF, IAC and fuel injectors with rail. There is no vacuum leaks. I just installed a pcm from zzp no luck. O2 seems to be working its fluctuating like normal.
I hooked up hp tuner to it and could see all cylinders are misfiring. The o2 is fluctuating like it is supposed too. The only code I get is p0300.
Misfire history
#1 1346
#2 59
#3 4504
#4 108
#5 58
#6 335
This was the highest misfire count I read. Other attempts where in the 300 to 500 hundred range.
It started right up. But idled rough, once it warmed up the rpms got worse and would shut off. On restart the rpm jumped from around 1200 to 400 until it shut off again.
When I installed the engine I put New spark plugs, new wires, new air filter, new fuel filter. After I got the p0300 code I put a new fuel pump swapped ICM and coils off of a known working car. I also swapped the cat, MAF, IAC and fuel injectors with rail. There is no vacuum leaks. I just installed a pcm from zzp no luck. O2 seems to be working its fluctuating like normal.
I hooked up hp tuner to it and could see all cylinders are misfiring. The o2 is fluctuating like it is supposed too. The only code I get is p0300.
Misfire history
#1 1346
#2 59
#3 4504
#4 108
#5 58
#6 335
This was the highest misfire count I read. Other attempts where in the 300 to 500 hundred range.