No Spark
Senior User
Joined: Jul 2001
Posts: 119
Likes: 0
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
Posting Guru
Joined: Jan 2001
Posts: 1,124
Likes: 1
From: Rural Florida Panhandle
No Spark
It sounds like you have at least one defective injector, and it is flooding those cylinders. You may also have an ignition problem, but if you have a cracked or stuck-open injector, you will ruin your engine if that is not corrected.
I am assuming you have already checked the distributor cap and plug wires for problems.
Winford
I am assuming you have already checked the distributor cap and plug wires for problems.
Winford
Senior User
Joined: Jul 2001
Posts: 119
Likes: 0
No Spark
I have installed new wires, plugs, cap and rotor.
How do I go about testing the injectors. I am going to get a new set of injectors from a friend next week so I might just switch them out.
I'll pull all the injectors off the motor tonight and inspect them. Thanks for your help
How do I go about testing the injectors. I am going to get a new set of injectors from a friend next week so I might just switch them out.
I'll pull all the injectors off the motor tonight and inspect them. Thanks for your help
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