Got DIC code: PCM 0300, misfire
Thread Starter
Racer
Joined: Apr 2002
Posts: 484
Likes: 0
From: Waldorf MD
Got DIC code: PCM 0300, misfire
Hello All,
I have a 2000 C5 FRC with a Vararam intake and Borla exhaust. No other engine mods, bolt on or otherwise. Here's my dilemma. Last week Wednesday I was driving to work and got stuck in traffic behind an accident. It was stop and go for about half an hour. After the traffic broke open I tried to accelerate and the car immediately sounded rough and was hesitant until heavy throttle. I checked the codes and got PCM 0300. I later checked the plug wires and they were all seated properly but is still running rough. Also, the exhaust smells a little strong as if it is running rich. The only thing I've done lately is change the AC belt a few days prior to that.
I need a place to start so I can fix this. I really want to drive my baby.
I have a 2000 C5 FRC with a Vararam intake and Borla exhaust. No other engine mods, bolt on or otherwise. Here's my dilemma. Last week Wednesday I was driving to work and got stuck in traffic behind an accident. It was stop and go for about half an hour. After the traffic broke open I tried to accelerate and the car immediately sounded rough and was hesitant until heavy throttle. I checked the codes and got PCM 0300. I later checked the plug wires and they were all seated properly but is still running rough. Also, the exhaust smells a little strong as if it is running rich. The only thing I've done lately is change the AC belt a few days prior to that.
I need a place to start so I can fix this. I really want to drive my baby.
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
There are two things to look for right off the top with the P0300. First and easiest is the ground wire(s) at the rear of the driver's side head. Make sure that bolt holding them on is tight. If it is tight, the next thing to do is to pull the valve covers and look at the valve springs for a possible broken spring.
Tech Contributor
Joined: Jan 2007
Posts: 19,342
Likes: 1,123
From: Dyer, IN
There are two things to look for right off the top with the P0300. First and easiest is the ground wire(s) at the rear of the driver's side head. Make sure that bolt holding them on is tight. If it is tight, the next thing to do is to pull the valve covers and look at the valve springs for a possible broken spring.
Thread Starter
Racer
Joined: Apr 2002
Posts: 484
Likes: 0
From: Waldorf MD
Eureka!! It was so simple. A plug wire had come loose from the coil pack side. As soon as I removed the driver side cover I saw it. Pushed it back on and started it up. No more misfire. Only wish I'd taken time to check it earlier but I thought I was going to run into some big issues and didn't want to tackle it until the weekend.
Tech Contributor
Joined: Jan 2007
Posts: 19,342
Likes: 1,123
From: Dyer, IN
Eureka!! It was so simple. A plug wire had come loose from the coil pack side. As soon as I removed the driver side cover I saw it. Pushed it back on and started it up. No more misfire. Only wish I'd taken time to check it earlier but I thought I was going to run into some big issues and didn't want to tackle it until the weekend.
