P 0300 random misfire - 2000 STS
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Northstar Engines and System Technical Discussion Discussion, P 0300 random misfire - 2000 STS in Cadillac Engine Technical Discussion; I have a random miss fire, i reaplaced plugs a coil packs two months ago. It doesnt seem to be ...
  1. #1
    J2000ssts is offline Cadillac Owners Member
    Automobile(s): 2000 STS, 135,000 miles
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    P 0300 random misfire - 2000 STS

    I have a random miss fire, i reaplaced plugs a coil packs two months ago. It doesnt seem to be a leak on the intake, egr its fine. Could it the problem be in the exhaust system?

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    1BadCadSTS's Avatar
    1BadCadSTS is offline Cadillac Owners Connoisseur
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    Year make model? How many miles? Have you done a tune up?

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    J2000ssts is offline Cadillac Owners Member
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    2000 seville sts 135000 miles ,yes like two months ago

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    1BadCadSTS's Avatar
    1BadCadSTS is offline Cadillac Owners Connoisseur
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    No intake leaks? Coils all good? Change the serp belt.

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    J2000ssts is offline Cadillac Owners Member
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    I got two stripped plugs in cylinders 6 and 8 , now what how can i fix that

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Pcm po300 random misfire

    This thread has nothing to do with "PCM Tuning". Moved to Northstar Performance.

    Stripped plugs in 2 cylinders = new cylinder head OR a very, very lucky expert thread repair job by an awfully good shop. In a perverse way, you're "lucky" the bad plug threads are in the left (front) head.

    ALWAYS place your car model and year in your profile. It sure makes diagnosis easier - due to radical differences in models/engines/years/parts.

  8. #7
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: P 0300 random misfire - 2000 STS

    Might look into Helicoil. They make thread repair kits for spark plug threads. Front side should be easy access.
    http://www.helicoil.in/

  9. #8
    J2000ssts is offline Cadillac Owners Member
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    Thanks, i took the car in to the shop. No striped plugs but the front ignition coil got replaced. They told me that the rear coil needs to be replaced. Well i ran the car for a week than abs and brake ligth and ttc came on .pulled the codes abs c1277 c1298 pcm p1571 p1644 and pcm u1040. I wonder if that rear ignition coil is making this codes pop up. When they come on the steering is hard and it feels like the car looses alot of power. Can some one help?

  10. #9
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: P 0300 random misfire - 2000 STS

    Without their definitions, codes are just numbers.

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