Crank no start?

EL_DERICK

MEMBER
1994 FORD F-150
5.8L
V8
2WD
AUTOMATIC
256,689 MILES

The engine cranks but won’t start before anything happen my flex’s plate had broken in half so I took my transmission off and installed a new flex plate after I put everything back together I go and try to turn it on but all it do is crank but won’t start ( If it starts only last 5 seconds) turns off.

I’ve had change the following:
1. Fuel pump
2. Fuel injectors
3. Fuel filter
4. Spark plug
5. Spark plug wires
Still no start

Sunday, May 11th, 2025 AT 11:08 AM

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
54,144 POSTS

I would look at the engine wiring harness grounds that could have been removed when doing the transmission work. Also, is the security light flashing? If so, this will be the problem as well. I would try a hard system reboot which can be done by following this guide:

https://www.2carpros.com/articles/step-by-step-guide-performing-a-hard-system-reboot-for-your-vehicles-electronics-systems

If this does not work let's run the codes to see if any are stored, this guide can help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Also, I would go over this video to see if it can give us a clue on why it won't start. If you turned the engine backwards it can cause the timing chains to jump FYI.

https://www.youtube.com/watch?v=lXLJbuAZ4CE&t

Please go over these guides and get back to us. Please upload pictures or videos in your response.

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Monday, May 12th, 2025 AT 11:25 AM

EL_DERICK

MEMBER
8 POSTS

I have check the wiring everything looks good I have reset it, and it still does the same thing I scan it and there’s no code popping up it says it’s clear I just need to check the timing chain but I uploaded a video hope that helps. Thank you

Video (Click to make bigger)

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Wednesday, May 14th, 2025 AT 7:34 PM

KEN L

MASTER CERTIFIED MECHANIC
54,144 POSTS

Thanks for the video, I can tell you the engine is in good shape and has good compression. I would make sure the ground wires at the bell housing are connected, also, check for spark like in the video and then use starting fluid to see if anything changes, also I would reset the inertia switch. Here is the location, push down on the button on top. Check out the images (below). Let us know how it goes.

Image (Click to make bigger)