1986 F-150, 302cid, EFI, won't start - Engine Troubleshooting


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1986 F-150, 302cid, EFI, won't start

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ruhkick
New User

May 6, 2007, 6:04 PM

Post #1 of 4 (2828 views)

1986 F-150, 302cid, EFI, won't start	Sign In

I just replaced the intake manifold gaskets because of a coolant leak, which required disconnecting the supply and return fuel fittings at the rail. I have verified spark and initial timing. I also verified fuel in the rail, but it still won't fire. If I hold the pedal to the floor it will backfire out the intake. I suspect an air lock in the fuel rail but don't know how to correct this. It is also quite possible that it is something else. Computer codes did not indicate anything wrong. Any suggestions would be greatly appreciated!
Thanks,
Rick

Tom Greenleaf
Ultimate Carjunky / Moderator
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May 6, 2007, 10:58 PM

Post #2 of 4 (2824 views)

Re: 1986 F-150, 302cid, EFI, won't start	Sign In

You said there was fuel in the rail but is there any pressure?

T

ruhkick
New User

May 7, 2007, 10:34 AM

Post #3 of 4 (2817 views)

Re: 1986 F-150, 302cid, EFI, won't start	Sign In

Tom,
I haven't measured the pressure, but it will spray fuel from the port on the rail and was running just fine before the gasket replacement. Also the fuel pump runs only for a short time when you turn the ignition on indicating it senses pressure.

Thanks

(This post was edited by ruhkick on May 7, 2007, 10:35 AM)

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

May 7, 2007, 10:42 AM

Post #4 of 4 (2814 views)

Re: 1986 F-150, 302cid, EFI, won't start	Sign In

If you prime the air horn/intake with starter fluid will it fire up and just die out? Maybe injectors aren't getting a pulse to operate and it can still just backfire on minimal leakdown??

T

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