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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

1988 f250 460 cranks but wont start

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Old Nov 22, 2022 | 06:48 PM
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1988 f250 460 cranks but wont start

Hello all! I have recently purchased a 1988 f250 with a 460 7.5 engine. The truck has dual tanks. Having trouble diagnosing crank but no start issue. I have dropped the front tank and checked fuel pump, it turns on and pumps fuel. I replaced the on rail high pressure fuel pump, still nothing. I disconnected the selector valve and cleaned it and reinstalled it, still nothing. i am getting 35 psi to the fuel rail. I am getting spark to all sparkplugs. It has a new distributor and new plug wires. i made sure that all the wires are going to the right plugs. I made sure that the timing is right. The truck cranks but will not start. Truck tries to start if i spray carb cleaner down the intake but not on its own. I am really at a loss after all of the troubleshooting i have done. Any help would be much appreciated.
 
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Old Nov 22, 2022 | 08:16 PM
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Sounds like the injectors are not working. Test with a noid light.
 
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Old Nov 23, 2022 | 07:07 AM
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What is a noid light?
 
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Old Nov 23, 2022 | 07:42 AM
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A noid light flashes on and off with the pulses from the PCM
 
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Old Nov 23, 2022 | 07:51 AM
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Plug the light into the injector harness to see if the computer is sending the signal to “fire” the injector.
 
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