Engine in my vxCommodore is Misfiring - Cars & Trucks

Take a look under the hood in the dark .You will see if it shorting out by the blue flashes I think oil leaking is the problem Also the oil breathing dystem may be blocked.

code p 0141 refers to heated oxygen sensor (HO2S) 2 bank 1--heater control--circuit malfunction===causes --wiring---HO2S--- ECM
code p 0144 refers to heated oxygen sensor(HO2S) 3 bank 1--high voltage ===causes wiring short to positive ---HO2S---ECM
also refers to oxygen sensor(O2S) 3 bank 1--high voltage ===causes wiring short to positive---O2S-- ECM
HO2S sensors are the units in the exhaust manifolds or before the cat converters
O2 sensors are after the cat converter
two completely different operations
use the special tool for sensors as the wires are easily damaged from the wrong tool use
as for misfiring you will get a P0300 (0300,0301,0302,0303 etc) depending on which cylinders are misfiring
when checking for misfiring the injectors , (blocked or not firing) are as important as plugs and wires
If the misfiring continues after sensor replacement , replace the ECM with a known good one as it is common to all fault codes and misfiring

the dash has a CEL lamp does it glow when misfiring?
that means scan it.
scan it for P03xx DTC errors, that tells you which coil is bad,
or wire, or cylinder is bad.
SCAN IT. that means do so when it misfires, not 2 hours later when not misfiring, as they self clear.

sounds like it could be a injector or the conection to the injector thats asuming the cylinder is ok has compresion.

I know what the problem is. It's going to cost u about $25,000 to fix the problem. Just buy a new car and dump that crappy piece of metal in a river. Mercedes Benz will never be on my wish list ever again. Even the mechanics can't figure out the problem with my check engine light after I pay $2,000 for a check engine light service. They F***** it up even more. My car now is in line to get a heart transplant because it's dying.

IF THE ENGINE IS MISFIRING YOUR ENGINE LAMP SHOULD BE ON IF NOT FLASHING DEPENDING ON HOW BAD THE MISFIRE IS. THE BEST THING TO DO IS GET THE CAR SCANNED FIRST TO SEE WHAT CYLINDER IS MISFIRING. YOUR LOCAL AUTOZONE WILL SCAN THE CAR FOR FREE. THEN AFTER I CAN HELP U MORE

Had the same thing. The didtributor was going bad. Lived with it for a few months finally it died. 1 year after replacing the distributor the problem started again. Glad I got a warranty on the distributor. Running great now on the second distributor.

They are still looking for a cause because it isnt misfiring right now or because they cant find the cause of the stored misfire codes ?
If it is misfiring right now and they cant figure it out then perhaps you should find new mechanics !
I have seen a lot of bad coils on the PT.
Misfire is usually caused by spark plug wires first, spark plugs 2nd, and coil third.
If it isnt misfiring now, spray down the wires with water. If it misfires after that replace the spark plug wires and spark plugs and try again.
If it still misfires then the problem will likely be the coil.

The engine is probably misfiring. You can verify if the engine is misfiring unplugging one spark plug cable at the time. If you have not done this before, better going to a mechanic and have the engine checked.

Code 1682 indicates low battery voltage. This could be a problematic alternator, which would likely cause misfiring. Autozone should be able to check this for you for free.

Code 1391 indicates the computer can not see the crank or cam sensor signal. This would likely be a result of the misfires.

Code 0320 indicates the crankshaft position sensor reference signal could not be found while the engine is cranking.

All of these issues point to either a cam/crank sensor malfunction or a charging system problem, either or both of which could cause the misfiring.