Need some help
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Senior User
Joined: Sep 2002
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From: New Orleans, LA
Need some help
Alright..new problem. Maybe someone has some suggestions for me. I just recently had my truck in for service at the dealership and had them change the fuel filter and also do an oil change (switched back to the Motorcraft oil from Mobil 1) Right after I got it back, I started experiencing a rough idle on start after it sits for an hour or two, or over night. The only time that it does not do it is if it just ran within the past 20min. It is sort of a hesitation. If I put it in gear and drive off, the truck shakes for maybe 500 feet, then it runs fine. Any suggestions? Im stumpped!
FLYINFORD
FLYINFORD
Thread Starter
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Senior User
Joined: Sep 2002
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From: New Orleans, LA
Alight, I checked the fuel filter. It is installed correctly. Does anyone think that the switch from synthetic to the stock Motorcraft oil could be the cause of this? If not, does anyone have any more suggestions that could cause that miss on start?
FLYINFORD
FLYINFORD
Post Fiend
Joined: Jan 2002
Posts: 5,859
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From: USA
They didn't over fill the oil did they? No the oil change from mobil 1 back to mc oil shouldn't cause it
maybe filter had crap in it Maybe crap floating in fuel lines to the injectors now
Were you having other problems prior to the filter change or have they gotten worse because of it. Fuel pump ,fuel pressure regulator.
Rich
maybe filter had crap in it Maybe crap floating in fuel lines to the injectors now
Were you having other problems prior to the filter change or have they gotten worse because of it. Fuel pump ,fuel pressure regulator.
Rich
Last edited by FortyFords; Jan 20, 2006 at 12:44 PM.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
Nah, the oil didn't do it... unless it's way overfilled or something.
I'd check if they spilled oil on the motor and washed it off with water. And got water in the spark plug holes.
Like Rich asked, did you have ANY problems before the oil/fuel-filter change?
I'd check if they spilled oil on the motor and washed it off with water. And got water in the spark plug holes.
Like Rich asked, did you have ANY problems before the oil/fuel-filter change?
More Turbo
Joined: Mar 2005
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Something else to check would be were they put the oil in, make sure the cap is tight or it lets unmetered air in the crankcase and gets sucked into the intake, in short, a vacuum leak. Also check the other tubes on the engine to ensure they are all the way on as well as the PCV vavle is in. I had one come out on a mustang and it drove fine but idled like crap sometimes. Creates a very dangerous lean condition when this happens.
Thread Starter
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Senior User
Joined: Sep 2002
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From: New Orleans, LA
Thanks for all of the replies! I had no problems what so ever prior to the oil and fuel filter change. Truck ran great. The truck still runs like a raped ape, just not for the first 30sec of the day. After just a few seconds of running, she is purring like a kitten. Throttle position has no effect on the roughness, if anything, it might make it slightly worse.
FLYINFORD
FLYINFORD
