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1999 Pontiac Sunfire PO200 & PO300 codes

Tiny
FREMONT
  • MEMBER
  • 1999 PONTIAC SUNFIRE
  • 160,000 MILES
Looked at almost everything that relates to these codes and I can't find anything wrong but I got a bad miss. What is the chance I got a bad PCM? GOOD wires, plugs, coils, ICM, New crank sensor, Cam Senor? Did unplug and did get code, so I believe it is good? Injectors are good, I did a noid check on all 4 and that looked good. High speed runs good, low speeds and idle a real bad miss?
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Saturday, July 13th, 2013 AT 8:36 PM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
Are you able to narrow it down to which cylinder is missing?
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Saturday, July 13th, 2013 AT 9:01 PM
Tiny
FREMONT
  • MEMBER
  • 8 POSTS
No I am not able to, it is so random. The spark plugs #3 & #4 were blackened(rich) #3 was more then #4. #1 & #2 looked good.I also hooked up my test light to see witch cylinder is missing and they all are. The car starts up with no problem. I tried a leak down by pulling sprk plug wires and it so hard to see a difference? I thought a about a compression test? The car has been running fine, so something went out just like that?
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Sunday, July 14th, 2013 AT 12:01 PM
Tiny
FREMONT
  • MEMBER
  • 8 POSTS
One other thing. I need to make up a fitting so I can check the fuel preasure. Do know if they sell that fitting/tool to hook up my fuel gauge tester? I will look on line for one. This is one thing I havent checked. I can hear it run when I turn the key I just don't know the PSI?
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Sunday, July 14th, 2013 AT 12:06 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
I'm not sure what type you have, but you should be able to find an adapter.
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Sunday, July 14th, 2013 AT 8:16 PM
Tiny
FREMONT
  • MEMBER
  • 8 POSTS
Fuel PSI/regulator is good. So what do you think?
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Monday, July 15th, 2013 AT 10:21 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
The ignition has new parts, the fuel pressure is correct and we have a misfire. Have you checked engine compression?
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Monday, July 15th, 2013 AT 8:39 PM

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