97' E350 V10 LONG CRANK
Lead Driver
Joined: Aug 2009
Posts: 7,563
Likes: 249
From: Laquey, MO
I wouldn't sweat the plugs right now.
If you try the coolant temp sensor with no improvement, I'd run a compression test when the engine is cold. This will rule out any mechanical issues. Remember - it needs 4 things to start: fuel, air, spark, and compression to run. A compression test will rule out 2 of the 4 (air & compression).
Keep us informed...
If you try the coolant temp sensor with no improvement, I'd run a compression test when the engine is cold. This will rule out any mechanical issues. Remember - it needs 4 things to start: fuel, air, spark, and compression to run. A compression test will rule out 2 of the 4 (air & compression).
Keep us informed...
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Fleet Mechanic
Joined: Jul 2010
Posts: 1,753
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From: Los Angeles, Ca.
My first suspicion would be fuel pressure. I know you did a pressure test, but try cycling the key on-off before trying to fire it. That'll give the pump more time to build up pressure before cranking. You could also try firing it and turning it off right away, then restart. If it starts quickly the second time or after 'priming' the pump it's likely fuel pressure. Could be a leak, regulator, or probably the pump starting to go.
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Fleet Mechanic
Joined: Jul 2010
Posts: 1,753
Likes: 34
From: Los Angeles, Ca.
Have you tried my start and restart test? It may point to a direction. I'd also check that the fuel press. regulator isn't leaking fuel to the vacuum line, would flood the motor when parked.
Lead Driver
Joined: Aug 2009
Posts: 7,563
Likes: 249
From: Laquey, MO
Have you read this thread? Sounds like its very similar to what you are experiencing.
https://www.ford-trucks.com/forums/9...-starting.html
https://www.ford-trucks.com/forums/9...-starting.html