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Anthony Borders Posted on Mar 22, 2015
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1998 pontiac bonneville ssei I changed plugs wires and coils. But it still comes up with a po300 code. What have I missed???

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guy dubeau

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  • Expert 309 Answers
  • Posted on Mar 22, 2015
guy dubeau
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Some codes need more than the reader to reset them like the ones at the repair shop some times after market coils will continue to give a bad reading

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2answers

Starts and runs great. But under load after converter locks po300 code come up

Worked on these for years. Get an ohm meter and check each coil. I would start there. If a resistance is different from the other two then that could be it. If you see rust that is a bad wire and coil too.

If you need further help, reach me via phone at https://www.6ya.com/expert/chris_b82b45c59bcf133d

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1answer

98 bonneville ssei 3.8 supercharged. problem; #4 cylinder misfiring

How long has it been since a tune up? I'd suggest plugs, wires, etc. (don't forget air and fuel filters while you're at it.)
0helpful
1answer

98 pontiac bonneville ssei misfiring at 30-45 mph. or when i try to get it to perform.

just fixed a car with a similar problem. check your crankshaft positioning sensor, then replace the plate that the coils sit on, it has went bad. the coils should be fine but that plate tells it when to fire.
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2answers

2000 bonneville

P0300 is a random misfire code, if you are not mechanically inclined the first thing i would do if you havent done so in the past year or more, is change the plugs and wires, a random misfire code can be caused by worn plugs and/or wires not firing properly. let me know if that fixes it.
0helpful
2answers

NY 1996 Pontiac Bonneville SSEi diagnostic trouble codes P0301 and P1441

Since it is a 1996, you probably have high miles on it.
Most cars after 100,000 miles or so are automatically set to have the check engine light come on.

Check these sites click here and here

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