MISFIRES

1992 Pontiac Sunbird

Tiny

t.o.nero

September, 16, 2012 AT 4:01 PM

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?

FOUND 5709 RELATED QUESTIONS

Engine Miss

52 ANSWERS
12 IMAGES

7 Answers

Tiny

saturntech9

September, 16, 2012 AT 4:19 PM

When does it miss?How bad does it miss?

Tiny

t.o.nero

September, 16, 2012 AT 9:57 PM

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

Tiny

saturntech9

September, 16, 2012 AT 11:30 PM

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.

Tiny

t.o.nero

September, 24, 2012 AT 6:58 PM

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

Tiny

saturntech9

September, 24, 2012 AT 10:53 PM

So you can't narrow it down to which cylinder?

Tiny

t.o.nero

September, 24, 2012 AT 10:54 PM

Ya I can't I know it's one of the 3 back ones not sure what one tho

Tiny

saturntech9

September, 24, 2012 AT 11:42 PM

Cant you see or hear the spark shorting to ground anywhere?

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