P2302, P2305 & P0300

[sjzdx]

I have a 2003 PT(not turbo). It has 70k miles on it and I recently have been having issues with it. The engine light comes on after the car is warmed up and the car starts running really rough. It feels like it is running on 2 cylinders. The codes I am getting are P0300, P2302 and P2305 from the OBDII. I had a shop look at it initially and they said it was the coil which they replaced. A month later...the same issue occured. I then replaced the coil on my own along with the spark plugs and the wires. This did not correct the issue. I then replaced the camshaft position sensor(about an hour ago) and still no change. It starts running rough only after it warms up to running temp. This seems to indicate its not just a faulty wire. I did trace my wires just incase but saw no issues.

I have searched these forums and read all the replys but never saw any resolution. Can someone please help me! I am at a loss as what to do.

[Chromenut]

Okay, here's what I come up with:
P0300 Random/multiple cylinder(s) - misfire detected Spark plug(s), HT lead(s), injector(s), ignition coil(s), low
compression, wiring

Now on the P2300's, I don't see any specific definition of them, looking at three different DTC books. Closest I see is:
P23XX Ignition System or Misfire

At only 70k miles, I don't think it's a timing belt issue. Have you check your injectors? And as to the coil, they seldom fail on these cars, and the aftermarket coils, per what I'm reading at PTCrew, aren't as robust as the factory coil.

One suggestion, remove one of the battery terminals for 5 minutes, press on the brakes a couple of times to bleed off any remaining charge, then reconnect. It will clear the DTC's for now, and maybe you'll get something fresh afterwords. These type of faults are sometimes the hardest to troulbeshoot over the internet.

[sjzdx]

Thanks for the reply.

P2302-IGNITION COIL #1 SECONDARY CIRCUIT-INSUFFICIENT
IONIZATION
P2305-IGNITION COIL #2 SECONDARY CIRCUIT-INSUFFICIENT
IONIZATION
P0300-RANDOM/MULTIPLE CYLINDER MISFIRE

These are the codes. I just cant seem to figure out the problem though.

[Chromenut]

Give your PCM a good cleaning... remove the negative terminal connection from your battery for about 5 minutes, during that time press on the brake pedal a couple of times to remove any residual charge, then hook it back up and go for a short drive. See if the same codes come back. I hate electrical problems!!

[sjzdx]

Well I disconnected battery for 5 min and pumped brake like you suggested. After 10 min of driving the engine light came back on and it started popping the p2302 and p2305 like before. It also started running horribly and stalling like before.

Back to square one with no ideas with whats wrong...joy.

[slartyblarfast]

Originally Posted by sjzdx

P2302-IGNITION COIL #1 SECONDARY CIRCUIT-INSUFFICIENT
IONIZATION
P2305-IGNITION COIL #2 SECONDARY CIRCUIT-INSUFFICIENT
IONIZATION
P0300-RANDOM/MULTIPLE CYLINDER MISFIRE
.

The codes mean that the PCM is not seeing the spark plug fire long enough. Typically it's because the spark is going to ground instead of firing through the plug. The fact that it's doing it only when the engine is hot makes me wonder....Makes me think it's a PCM problem but not sure....
Have you replaced the plugs and wires yet? It's kind of a stretch. Electricity is lazy and always seeks the easiest path to ground. If that is through the plug wire into the head instead of firing the plug then that's what it will do. At 70k should have already had a tune up and new wires but unless you know the entire service history it can be hard to know. That's the most likely issue especially with the p0300 random or multi cylinder missfire.