Need Help
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Logistics Pro
Joined: Feb 2004
Posts: 4,460
Likes: 14
From: The Land Of Time
Need Help
Hey Guys,
I am working on a friends truck and it has a stumble and a pop under load. Doesnt happen all the time. I have already replaced the plugs and wires with new motor craft parts. Anything out there that may be of help I would appriciate it. Its a 2001 F-150 4.2 v-6. It also has a new fuel filter as well. Automatic 4x2. I didnt know if there was a bulletin or updated calibration to fix this or maybe the coil is shorting out. The plugs on the 1&3 cylinders were carbon tracked last time they were replaced. Also the CEL does not come on and the scan tool that I have doesnt allow me to view misfire data.
Thanks,
Sarge
I am working on a friends truck and it has a stumble and a pop under load. Doesnt happen all the time. I have already replaced the plugs and wires with new motor craft parts. Anything out there that may be of help I would appriciate it. Its a 2001 F-150 4.2 v-6. It also has a new fuel filter as well. Automatic 4x2. I didnt know if there was a bulletin or updated calibration to fix this or maybe the coil is shorting out. The plugs on the 1&3 cylinders were carbon tracked last time they were replaced. Also the CEL does not come on and the scan tool that I have doesnt allow me to view misfire data.
Thanks,
Sarge
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
Pop as in fuel igniting in the exhaust? That would tell me either the cylinder isn't firing or has too much fuel in it. A rich/not igniting cylinder's exhaust port should be colder than the rest. If you have a IR thermometer you can read the temps, or you can spray water on the manifold and the cooler ones shouldn't steam as quickly.
