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I’m having a no spark condition on my 91 f250


I’m having a no spark condition on my 91 f250 Mechanic's Assistant: What year is your Spark? 1991 Mechanic's Assistant: Are you fixing your Spark yourself? What have you tried so far? I’ve taken codes, replaced i...

I’m having a no spark condition on my 91 f250 Mechanic's Assistant: What year is your Spark? 1991 Mechanic's Assistant: Are you fixing your Spark yourself? What have you tried so far? I’ve taken codes, replaced ignition parts, set timing etc Mechanic's Assistant: How many miles are on the Chevrolet? Have you noticed any change in your gas mileage lately? 100,000 no

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Responses

Automotive Expert
Good Afternoon , What [engine](/topics-engine-chevy/) do you have ? All that can casue no spark on these is the ignition module and the pickup coil in the distributor and [ignition coil](/topics-ignition-coil-chevy/) . what have you already replaced ?

Hey I've got a 1991 7.5L 460
Automotive Expert
OK and what have you replaced already ?

I've replaced the entire distributor, used MSD plug wires, replaced the eec, fuel and [horn](/topics-horn-chevy/) relay under the hood. Ignition control module (tfi) the bolt thing o can think of now is the pip sensorThe only thing\*I'm getting zero spark still I pulled codes and none of them relate to ignition
Automotive Expert
are you getting power to the coil ?

6-7 volts in run yes
Automotive Expert
that's not enough you should be getting 10.5 to 12 volts

I'll check again but I was told 6-7 with KOEO was fine so long as I have greater than 10 while cranking
Automotive Expert
here is all the information about checking this ignition system

The distributor I had prior to this went through one pip sensor as well. I'm thinking defective wiring?
Automotive Expert
Here is the wiring diagram . I would go through all the steps and check it out so you know exactly what the problem is .

Alright thanks I appreciate it
Automotive Expert
my pleasure

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