Hard to start when cold, starts fine when warmed up

wierdfoot · 2020-02-21T11:04:07+00:00

Engine very hard to start when cold. Cranks over but very hard to start. Have replaced fuel pump, throttle body and fuel pressure relay. Little if any improvement. When engine first starts when cold it has a slight lope then smooths out. Engine will have a slight intermittent surging up and down by about 100 rpm's. After about 45 seconds engine runs fine and no problem in restarting when shut off. Problem only occurs if engine is cold. Any ideas?

2010 FORD F-150

126,000 MILES • 5.4L • V8 • 4WD • AUTOMATIC

JACOBANDNICKOLAS

✓ASE Certified Mechanic
110,194 POSTS

No problem whatsoever. I feel bad I didn't help. And yes, I agree the box that was removed was likely that cause. I have no idea why it would have been removed. Ugh!!! I was always taught that if it isn't broken, don't fix it. LOL And that includes removing parts and not telling a customer.

The really funny thing about this is I had a conversation with a 17 year old telling him the best way the vehicle will ever run is the way the engineers designed it to run. Yes, things can be done to make the faster, but that is usually at the cost of dependability. He just got an older Ford Ranger and was telling me how he was going to change everything. LOL Well, at least I warned him. LOL

Regardless, please feel free to come back anytime in the future if you have questions or need something. You are always welcome here.

Take good care of yourself. And I know your replies will help others.

Joe

May 3, 2021 at 6:20 PM

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