302 efi

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Feb 9, 2020 | 03:06 AM

Stewart island

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Joined: Jan 2020

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302 efi

I have been cranking engine while trying to determine why no spark. I havent disconnected fuel relay. Can this sunburnt fuel cause damage to engine bore or starter motor overloading? It will evaporate with time or drain down into oil? Will fowl plugs?

Feb 9, 2020 | 06:23 AM

torq'ta 5 8

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Joined: Jan 2019

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From: N.W. Alabama

model, year of truck, trans, how long has it been sun burning? I would drain out, no matter, and remove that variable
Part 1 -How to Troubleshoot a No Start (Ford 4.9L, 5.0L, 5.8L).

Feb 9, 2020 | 12:09 PM

joey2fords

Fleet Mechanic

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took me a while to figure out that you mean "unburned", not "sunburnt".
if you get enough of it into your cylinders it can definitely bridge the spark plug gap.
disconnect fuel relay, remove spark plugs to ensure they are not fuel soaked and carry on troubleshooting for no spark.

Feb 9, 2020 | 01:47 PM

88n94

Cargo Master

Joined: Jan 2004

Posts: 3,118

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From: South Dakota

Depending on why it is not firing, you may not be getting any fuel into the cylinders. I see you have a 1986. I have had a lot of ignition modules go dead on this vintage of Fords, and even after a fair amount of cranking in some cases the engine will start right up with no sputtering from excess fuel after replacing the ignition module.

If you haven't looked into having a bad ignition module, I would first thing.