Hello Everyone,
I have a 2003 Mustang GT that was running strong until about 1 week ago. I replaced the battery (Cell 2 was dead) and an Advanced Auto. While there they went ahead and ran a diagnostic on my car. They said my alternator read "Phase 2 - Open" which I would assume is a bad diode. However, car maintains a solid charge and this issue goes relatively unnoticed with the exception of a radio light blink here and there.
As soon as I pulled out of the parking lot, I accelerated and the car immediately cut out, sped up, cut out, sped up, etc. in all gears until I would reach approximately 3500 rpm. During this 'Misfire?' the car jerks quite bad and the exhaust sounds completely different as if it was muffled - almost a farting noise. A quick Google search revealed basic tune up (Spark plugs, COP's, Rotor/Cap, Fuel Filter).
I replaced all 8 spark plugs, which showed no unusual signs upon examination. I examined the COP's at the same time and they looked brand new. I saw an interesting test on Troubleshootmyvehicle dot com where you unplug the injection wire one valve at a time. If you notice a reduction in rpm or vacuum, then the COP is working properly as the car is dependent on its power. I performed this test on all 8 valves and they all reduced the rpm. When I got back in the car, and took off to run an errand, the misfiring/sputtering/cutout is worse than ever in all gears through all rpm ranges. I verified that the injection wires are secure. Any idea where to go with this? Did I just diagnose that the injection valves are the issue? Sorry for a long and possibly confusing post but am trying to give as much detail as I can. Any help is greatly appreciated.
Jared
I have a 2003 Mustang GT that was running strong until about 1 week ago. I replaced the battery (Cell 2 was dead) and an Advanced Auto. While there they went ahead and ran a diagnostic on my car. They said my alternator read "Phase 2 - Open" which I would assume is a bad diode. However, car maintains a solid charge and this issue goes relatively unnoticed with the exception of a radio light blink here and there.
As soon as I pulled out of the parking lot, I accelerated and the car immediately cut out, sped up, cut out, sped up, etc. in all gears until I would reach approximately 3500 rpm. During this 'Misfire?' the car jerks quite bad and the exhaust sounds completely different as if it was muffled - almost a farting noise. A quick Google search revealed basic tune up (Spark plugs, COP's, Rotor/Cap, Fuel Filter).
I replaced all 8 spark plugs, which showed no unusual signs upon examination. I examined the COP's at the same time and they looked brand new. I saw an interesting test on Troubleshootmyvehicle dot com where you unplug the injection wire one valve at a time. If you notice a reduction in rpm or vacuum, then the COP is working properly as the car is dependent on its power. I performed this test on all 8 valves and they all reduced the rpm. When I got back in the car, and took off to run an errand, the misfiring/sputtering/cutout is worse than ever in all gears through all rpm ranges. I verified that the injection wires are secure. Any idea where to go with this? Did I just diagnose that the injection valves are the issue? Sorry for a long and possibly confusing post but am trying to give as much detail as I can. Any help is greatly appreciated.
Jared