Starting Hesitation
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Laughing Gas
Joined: Oct 2007
Posts: 773
Likes: 1
Starting Hesitation
I just bought a 1994 F350 7.5L with 50k miles. Does anyone have any idea why it sort of hesitates to start? Watch my video below to see what's going on. It doesn't roar to life like it should; instead it sort of just slowly rumbles up to speed. Sometimes it's worse and will actually die, and other times it will actually start like a normal vehicle, but that's not too often.
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
Fuel pump!
Just went through this with my front tank on my 95 F150 with only 95K miles. It was starting "hard", stumble, etc. Ran it dry, installed new pump and presto it fires up instantly.
The old pump gets weak, won't always put full pressure to the fuel rail, thus it stumbles to run. Mine was random, but getting worse. Better to do it with an empty tank then having to empty it after you just filled it up.
Just went through this with my front tank on my 95 F150 with only 95K miles. It was starting "hard", stumble, etc. Ran it dry, installed new pump and presto it fires up instantly.
The old pump gets weak, won't always put full pressure to the fuel rail, thus it stumbles to run. Mine was random, but getting worse. Better to do it with an empty tank then having to empty it after you just filled it up.
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
Well, you have to ask yourself a question, do I feel lucky?
Do I throw parts at it or do I diagnose it?
You haven’t completed a complete tune-up yet….
You haven’t checked the Codes yet….
I would check the fuel pressure before I purchased any fuel system components.
750 Post; you know all this……
Do I throw parts at it or do I diagnose it?
You haven’t completed a complete tune-up yet….
You haven’t checked the Codes yet….
I would check the fuel pressure before I purchased any fuel system components.
750 Post; you know all this……
Logistics Pro
Joined: Mar 2005
Posts: 4,698
Likes: 47
From: Mexico, Missouri
As was stated before, check for codes. Get a fuel psi reading, with engine off, key on. Then key on, engine running.
Check plugs, inspect cap and rotor.
Start with free, or almost free basics and diagnostics before throwing money and parts at something.
Check plugs, inspect cap and rotor.
Start with free, or almost free basics and diagnostics before throwing money and parts at something.
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Laughing Gas
Joined: Oct 2007
Posts: 773
Likes: 1
Problem solved. Turns out the ignition timing was waaay retarded. It was at like 0 deg BTDC, so I disconnected the SPOUT plug and set it to 12 deg BTDC. It starts with ease and is like a whole new engine now. I think the PO or someone must have tried setting it without disconnecting the SPOUT plug, thereby totally screwing it up...
Thanks for all the advice everyone.
Thanks for all the advice everyone.
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