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Sunbird misfires

Tiny
T.O.NERO
  • MEMBER
  • 1992 PONTIAC SUNBIRD
  • 90,000 MILES
Its a 1992 sunbird gt 3.1L it has been misfiring for the past few months I have changed the fuel filter replaced most of the fuel line new spark plugs and wires a new EGR with new mufflers ran injector cleaner non of this did anything any ideas?
Sunday, September 16th, 2012 AT 4:01 PM

7 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
When does it miss?How bad does it miss?
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Sunday, September 16th, 2012 AT 4:19 PM
Tiny
T.O.NERO
  • MEMBER
  • 4 POSTS
Its starting to do it at an idle and it does it every turn of the engine if I floor it or just does it randomly it also has a knocking in the engine now
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Sunday, September 16th, 2012 AT 9:57 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
At idle pull off a spark plug wire and put it back on do that with all the wires and see if the rpms drop on each wire you pull off. Becarefull not to shock yourself let me know what you find.
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Sunday, September 16th, 2012 AT 11:30 PM
Tiny
T.O.NERO
  • MEMBER
  • 4 POSTS
Alright I did what you said and I found out that it's one of the 3 in the back of the engine but I can't figure out what one cuz it doesn't misfire all the time
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Monday, September 24th, 2012 AT 6:58 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
So you can't narrow it down to which cylinder?
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Monday, September 24th, 2012 AT 10:53 PM
Tiny
T.O.NERO
  • MEMBER
  • 4 POSTS
Ya I can't I know it's one of the 3 back ones not sure what one tho
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Monday, September 24th, 2012 AT 10:54 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Cant you see or hear the spark shorting to ground anywhere?
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Monday, September 24th, 2012 AT 11:42 PM

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