Hard start when cold/low power
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Trailering
Joined: Jul 2025
Posts: 19
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Hard start when cold/low power
89 F250 4WD 5.8 liter EFI, 300K
Truck is slow to start in cool/cold weather (starts and stutters after 3-4 cycles of the ignition). Starts fine in warm weather even when engine is cold. Starts fine after it has been warmed up. No check engine light and only code is 11 and 33. Also, the engine isn’t putting out normal power. It will just maintain speed in 5th gear on flat ground if no head wind…gutless wonder. The motor does not use oil or smoke. I replaced both fuel tanks with new pumps and fuel pressure is within range. I have replaced some vacuum lines. Where do I begin to diagnose the starting issue? Thanks a bunch!
Truck is slow to start in cool/cold weather (starts and stutters after 3-4 cycles of the ignition). Starts fine in warm weather even when engine is cold. Starts fine after it has been warmed up. No check engine light and only code is 11 and 33. Also, the engine isn’t putting out normal power. It will just maintain speed in 5th gear on flat ground if no head wind…gutless wonder. The motor does not use oil or smoke. I replaced both fuel tanks with new pumps and fuel pressure is within range. I have replaced some vacuum lines. Where do I begin to diagnose the starting issue? Thanks a bunch!
Thread Starter
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Trailering
Joined: Jul 2025
Posts: 19
Likes: 1
Hard cold start
Update. I have checked every vacuum line and tested with brake cleaner and can’t find a leak. Both fuel tank pumps, high pressure pump, filter are all new and fuel pressure is good at start and load. Truck starts fine when warm but slow to start when cold. No codes. Where do I look next ? Thanks
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captaincook
6.0L Power Stroke Diesel
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Jun 3, 2007 03:54 PM
