Jnip87
Junior Member
- Joined
- Jun 14, 2014
- Posts
- 13
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So I have been fighting with a bad hesitation / misfire in my car for well over two months now and at my wits end, I have an 05 gt 4.6 3v, with a kenne bell 2.6 running 39lb injectors, tuned by run with the devil tuning in 07 and the tune has been on it since then with no issues. So far I have check and verified that I have injector pulse and ignition pulse at the coils and the injectors, I replaced the spark plugs which seemed to help a very small amount but didn't resolve the issue, I ran chevron techron fuel system cleaner through the tank with only 10 gal since that is what ford recommends, I replaced the fuel filter, reflashed the tune onto the ecu, swapped the alternator with a friends due to my voltage being sporadic ranging anywhere from 10.7 to 15.2 while driving buts holds steady at 14.2 at idle, it did the same thing with the donor alt as well, I am fairly certain that there is a problem there because my headlights seem to dim at a stop and brighten when I accelerate again. My fuel pressure also fluctuates when the car does its hesitation, which is not always present, it mostly happens once the car is warmed up and when maintaining a speed, if I am leaving a stop light and just causally going through the gears there is no problems, but once up to speed it will begin bucking and falling on its face, come to a stop and start over and its gone again. While it is hesitating the fuel pressure seems to drop then spike over and over, but my scan gauge that reads the pressure on the rail holds fairly steady around 38-42lbs, while the gauge in the pod will drop to under 20 and up to 60? im not getting any other codes to lead me to a sensor, like a cam phasor or crank sensor which would be really helpful btw. only those coil codes. also I swapped around the coils but to no avail, the idle never seemed to change and the codes are for all 8 cyl so no help there narrowing it down to a specific cyl either. Please help this car is my daily that I go to work in and take my kid to daycare with, I have been having to tear into it after work and put it back together so I can drive it the next day. Any help would be appreciated.