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Miss fire

Tiny
DIVERMEDIC06
  • MEMBER
  • 2002 PONTIAC GRAND AM
  • 2.5L
  • 4 CYL
  • AUTOMATIC
  • 165,000 MILES
670 miles ago I had work on my car and the cat was changed. I changed the spark plugs today went for a drive stopped at the store it was running great till I got back in the car and it starts to miss fire like once before
Wednesday, April 20th, 2016 AT 8:41 PM

5 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Misfires are hard to find check for vacuum leaks, fuel pressure, and compression. then have it scanned auto parts can't read what needs to be so a mechanic will have to do it. you said it misfired prior to replacing plugs. so it's something else.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Thursday, April 21st, 2016 AT 6:17 AM
Tiny
DIVERMEDIC06
  • MEMBER
  • 5 POSTS
Well my neighbor put scan to it and it came back approved no codes
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Thursday, April 21st, 2016 AT 7:21 AM
Tiny
DIVERMEDIC06
  • MEMBER
  • 5 POSTS
When I start the car it will idel hard and if I turn the air con on it will die
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Thursday, April 21st, 2016 AT 7:25 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If there areno codes there is not a misfire if there was it would show it via code. Check for a vacuum leak and fuel pressure.
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Thursday, April 21st, 2016 AT 8:22 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,072 POSTS
Hey Divermedic06

When you changed the plug did you do the plug wires as well?
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Thursday, April 21st, 2016 AT 5:25 PM

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