Forum Replies Created
- Replies
Update to this issue.
We happened to have an ignition module and coil pack taken from another car that was compatible with the 03 Malibu. We swapped it out and turned on the car to observe behavior.
Behavior: When the car is cold it runs fine. Once it warms and the idle settles down then the misfires begin to happen. We hooked a timing light up to various wires and all of the cylinders are actually misfiring it’s just happening more on 3 and 5. But watching the timing light it sparks fine for awhile then misses and sparks fine and misses.
Any ideas? As mentioned before the crankshaft sensor was replaced. Could be cam sensor or computer related?
We went back and looked at everything last night and didn’t see anything. So to rule out the injectors we put a timing light on it. That revealed that spark was dropping for 3 and 5 but the rest were ok. Since 3 and 5 aren’t on the same coil would ruling out coil pack be ok? Since we know spark is dropping where should our efforts be targeted toward now?
We did replace the crankshaft sensor and nothing was touched regarding the harmonic balancer.
Perhaps the ignition control module is the issue? If I were to take it out would a test at Autozone be able to tell me if it’s indeed bad?
This particular guy seems to have the same issue and it was the ICM. http://www.gmforum.com/general-gm-chat-88/3-1l-p0300-dtc-random-multiple-cylinder-misfire-305588/
We went back and looked at everything last night and didn’t see anything. So to rule out the injectors we put a timing light on it. That revealed that spark was dropping for 3 and 5 but the rest were ok. Since 3 and 5 aren’t on the same coil would ruling out coil pack be ok? Since we know spark is dropping where should our efforts be targeted toward now?
We did replace the crankshaft sensor and nothing was touched regarding the harmonic balancer.
Perhaps the ignition control module is the issue? If I were to take it out would a test at Autozone be able to tell me if it’s indeed bad?
This particular guy seems to have the same issue and it was the ICM. http://www.gmforum.com/general-gm-chat-88/3-1l-p0300-dtc-random-multiple-cylinder-misfire-305588/
I removed the starter relay, replaced the fuse and turned the key. The fuse did not blow. I put the relay back in and the fuse blew.
I removed the starter relay, replaced the fuse and turned the key. The fuse did not blow. I put the relay back in and the fuse blew.
No vacuum leaks found. I had a friend run an in-depth scan to get more info about the 0300 code and found that cylinders 3 and 5 had thousands of misfires whereas the others hadn’t any. Could my coil packs be bad? Unfortunately 3 & 5 aren’t on one coil pack.
No vacuum leaks found. I had a friend run an in-depth scan to get more info about the 0300 code and found that cylinders 3 and 5 had thousands of misfires whereas the others hadn’t any. Could my coil packs be bad? Unfortunately 3 & 5 aren’t on one coil pack.
Yeah the code certainly doesn’t help matters. Not sure if this could mean anything but when I start the car with the air conditioning on and drive for awhile and idle it doesn’t idle very rough. When I turn it off that’s when it become very noticeable.