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Intermintent P0300 random misfire

This is a discussion on Intermintent P0300 random misfire within the General Help forums, part of the LSx Technical Help Section category; Misfire like that certainly sounds like a coil, ignition wire or plug issue....

  1. #21
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    pajeff02's Avatar
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    Misfire like that certainly sounds like a coil, ignition wire or plug issue.

  2. #22
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    Quote Originally Posted by pajeff02 View Post
    Misfire like that certainly sounds like a coil, ignition wire or plug issue.
    Wires and plugs are new. Since I can now better duplicate the issue I might be able to narrow it down to which cylinder is missing. Are the any tests I can do on the coils besides swapping them? Like with a voltmeter.

  3. #23
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    Alright got some data of sorts! HELP!!!! Now that the issue is easier to duplicate I got home (it started after about 3/4 of a mile then quit when I goosed it for the rest of the 15 mi ride home) cranked it up and waited a few minutes, it started. I have a temp gun and the whole passenger side headers were at around 215-240F the drivers side was 450ish. Unplugging the gray coil plug for the whole bank that did nothing, as did unplugging a few injectors I could reach (2 and 6). I tested #2 by putting a bolt in the boot where the plug goes and it jumped a 1" to ground (although I shut off the car to rig up the test rig so I'm not sure if it was missing then or not). I'm thinking it's the passenger side 02 sensor telling the bank to go full rich and cooling the headers down? The exhaust kinda smells like gas and my mileage has not been great.

  4. #24
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    Are the plugs on that side totally black?

  5. #25
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    I pulled #2 it looked ok. The old 02 sensor on that bank was loose, both were sooty as is the exhaust. Sensors changed, car running smoother. Fingers crossed.

  6. #26
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    Should be fine now. Get back to us if you need anything else.

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