misfire

[firebird19_99]

my car started misfiring today and when i went to autozone to have it checked they told me it had multiple misfires ..they told me it was either the plugs, injectors or coils...is there a way to test each of these before having to replace one or the other and that not being the problem. i changed the plugs and wires last year so i dont think its that.

[TheGr8Schlotzky]

Re: misfire

Visually inspect all wires for burns or fraying, check the seating of the plug boots. You may want to check all the plugs visually as well to see if any are damaged or worn. Run a can of seafoam in your tank, or other injector cleaner. Might want to do the whole treatment just because. Then buy a single coil pack for like 20 bucks and rotate it through the three to see if the problem is fixed. Keep it clean in case it doesn't fix the problem so you can return it.

[firebird19_99]

Re: misfire

thanks and will do...the misfire gets worse at higher rpms if i keep them low the car seems fine until i step on the gas then its starts stuttering. thanks bro

[TheGr8Schlotzky]

Re: misfire

It would be worth changing the fuel filter as well if you haven't recently, though the symptoms of a bad fuel filter are usually minor stuttering at higher rpms, and it sounds like yours are more serious.

[pathology knight]

Re: misfire

sounds like exactly what my car was doing a little while ago. I just put new plugs in before x-mas too. turns out one of the plugs were bad. replaced it and it works fine.

[firebird19_99]

Re: misfire

damn theres a snowstorm over here so checking this is going to be a problem unless theres a quick easy way??

[firebird19_99]

Re: misfire

i seafoamed it but it still has the misfires also it stalled out while i was warming it up and letting it run.

[TheGr8Schlotzky]

Re: misfire

During the seafoam treatment? That's not too unusual. Only be concerned if it happens again. I personally and leaning toward a spark plug issue, so the best thing to do would be to visually inspect and regap the plugs.

[pace2006]

Re: misfire

Autozone should be able to test the resistance of each coilpack. Pull them and have them check each one out.

[firebird19_99]

Re: misfire

ok thanks and it was during i seafoamed it, just during a normal warmup that it stalled...also my oil pressure fluctuates at times and my steering gets stiff when driving but comes back to normal if im pressing the gas pedal while turning

[Bird_Of_Prey]

Re: misfire

ok thanks and it was during i seafoamed it, just during a normal warmup that it stalled...also my oil pressure fluctuates at times and my steering gets stiff when driving but comes back to normal if im pressing the gas pedal while turning

Did autozone tell you which cylinders are missing? If they are run by the same coil, it's the coil. Otherwise, double check the plug wires.

[Leonard 3.8L]

Re: misfire

I have had some coils with rust on them. Sometimes the water gets to them and completely rusts them out. You could take them off and inspect them. I know the weather isn't too great anywhere - lol.

[firebird19_99]

Re: misfire

idk if this works or is smart but i disconnected each wire from the coil pack one by one while running to see if i could find which one was bad but what i saw is that when i disconnected the wires from the two front coil packs the coil pack would try to make contact and you could see the electricity sparking blue but for the last coil pack you couldnt see anything like in the first two but you could feel it a little (it doesnt hurt that much lol) so would you guys think the last coil pack could be going bad? ill go back to autozone and see if they can tell me which cylinders are bad

[pace2006]

Re: misfire

idk if this works or is smart but i disconnected each wire from the coil pack one by one while running to see if i could find which one was bad but what i saw is that when i disconnected the wires from the two front coil packs the coil pack would try to make contact and you could see the electricity sparking blue but for the last coil pack you couldnt see anything like in the first two but you could feel it a little (it doesnt hurt that much lol) so would you guys think the last coil pack could be going bad? ill go back to autozone and see if they can tell me which cylinders are bad

Have them check the code again. If it just says random multiple misfire and doesn't say which cylinder's off, try pulling that last coilpack and have them test it. Also check for any corrosion at the connection between the ICM and coilpack.

[firebird19_99]

Re: misfire

they did tell me it had "multiple cylinder misfires"