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Tim's Auto Repair
Tim's Auto Repair, Mechanic
Category: Car
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Experience:  Have owned a repair shop for 25 yrs.
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1996 Pontiac Grand Am: liter..misfire on nol. 4 cylinder..coils

Resolved Question:

I have a 1996 Pontiac Grand Am with a 2..4 liter quad engine. I have a misfire on NOl. 4 cylinder, code P0304. Have had this problem before, changed both coils and it solved the problem. Having same problem again and changed crank sensor, solved the problem for about a month. Problem back again, same code. Changed crank sensor again, did not solve problem. Installed new spark plugs and checked fuel injectors with noid light, checked out good. Switched coils one side to the other, still have misfire. Cylinder compression all within specs.
Please advise,
Thanks, [email protected]
Submitted: 4 years ago.
Category: Car
Expert:  Tim's Auto Repair replied 4 years ago.

tims auto repair :


tims auto repair :

i think i may be able to help you here

tims auto repair :

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Expert:  Tim's Auto Repair replied 4 years ago.

this problem is most of the time caused by a bad coil housing..this is the hard plastic piece that covers the coils and sits down on the plugs..these can be bad even if they look new.....and,it is possible to get a bad new one........

replace the coil housing and install new plug boots..i would think this will fix you


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