Hey guys im a new member an have a question! I just biught another mustang an its an 02 gt! Im new to these, im a Foxboro kinda guy! Lol! Anyways its having misfire codes an my number 7 cylinder isn't getting fuel!? So I checked my compression an its perfect! So I unplugged my injector while car qas idling an nothing changed! But unplugging any of the other injectors it made the car idle differently? So im thinking my number 7 injector is bad! Any thoughts or answers would be greatly appreciated! Thanks guys!
2002 gt misfire issue's!
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Welcome to the site!! I moved you to the 4.6 Tech section.
When you pulled the spark plug,was there fuel on it?
When you pulled the spark plug,was there fuel on it?
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9 times out of 10 a mis-fire with these cars is due to the coil going bad, but it is possible that the injector is bad (although I highly doubt it is).
A simple test to do first, move the #7 coil to another cylinder and see if the code follows that coil. If it does, then it's the coil. If it doesn't, then you can concentrate on the injector...
A simple test to do first, move the #7 coil to another cylinder and see if the code follows that coil. If it does, then it's the coil. If it doesn't, then you can concentrate on the injector...
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Suggestion. Get yourself a mechanic's stethoscope and "listen" to the mechanical click of the injector. Compare to the other injectors.
If no mechanical click heard, then then next attempt to isolate the reason to mechanical or electrical.
To determine if the injector is getting the electrical firing pulse, use a noid style test light across the fuel injector. The test light should blink. If no blink then the focus should be on the electrical connector, wiring, or PCM.
If a fuel injector problem is suspected, consider an injector cleaning/flow test service such as InjectorRX.com. Once cleaned and tested they are as good as new. Cheaper than new.
Another option is to buy some number of used units (stevew01) and have the replacements tested and cleaned. Then a known good unit will be installed.
Me personally whenever I have had fuel injector issues in the past have pulled all (8) and sent them out for cleaning/testing. To me it's about as much work to pull one as it is 8. IMO better to get it done right the first time and be done with it.
Swapping the COP is also a great way to isolate a possible bad part. The COP's are stupid easy to swap and the results are easy to see. Note, be sure to clean out the spark plug wells (moisture and/or dirt).
If no mechanical click heard, then then next attempt to isolate the reason to mechanical or electrical.
To determine if the injector is getting the electrical firing pulse, use a noid style test light across the fuel injector. The test light should blink. If no blink then the focus should be on the electrical connector, wiring, or PCM.
If a fuel injector problem is suspected, consider an injector cleaning/flow test service such as InjectorRX.com. Once cleaned and tested they are as good as new. Cheaper than new.
Another option is to buy some number of used units (stevew01) and have the replacements tested and cleaned. Then a known good unit will be installed.
Me personally whenever I have had fuel injector issues in the past have pulled all (8) and sent them out for cleaning/testing. To me it's about as much work to pull one as it is 8. IMO better to get it done right the first time and be done with it.
Swapping the COP is also a great way to isolate a possible bad part. The COP's are stupid easy to swap and the results are easy to see. Note, be sure to clean out the spark plug wells (moisture and/or dirt).
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