No Spark
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Senior User
Joined: Jul 2001
Posts: 119
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No Spark
Well here is the problem, on my 91 F150 302 4x4, four cylinders are not firing. I get a very weak spark if any on cylinders. The firing order is 15426378, cylinders 2637 are the ones that are not firing.
I know they are getting fuel, wet plugs, gas in oil (had to change oil yesterday). I measured voltage in the TFI harness and it is getting voltage, and if the TFI isn't working it wouldn't be getting fuel. I am thinking that it is the PIP sensor.
Any ideas or suggestions on what to check?
Thanks
I know they are getting fuel, wet plugs, gas in oil (had to change oil yesterday). I measured voltage in the TFI harness and it is getting voltage, and if the TFI isn't working it wouldn't be getting fuel. I am thinking that it is the PIP sensor.
Any ideas or suggestions on what to check?
Thanks
Elder User
Joined: Jul 2001
Posts: 937
Likes: 0
No Spark
Personally I think it could be TFI. I'm not aware of anything that will restrict fuel if there's no spark. There may be somthing to stop the fuel pump until a tach reading is seen, but it wouldnt' cause your symptoms.
But let us know what you find.
But let us know what you find.
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