Rough Idle Problem.....
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Freshman User
Joined: Apr 2003
Posts: 43
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From: Pinecrest, Fla
Rough Idle Problem.....
Tricky... Here goes...
94 F150 4x4 302 with dual tanks.
Intermittenly, the truck idles really rough. I can tell when this is going to happen before I start it up as the fuel pump will run continuously. Usually, it runs for about 1.5 seconds before I start the truck. 50% of the time I will turn the key to the on position, prior to a full start, and the fuel pump will start to run, but it will run contiueously. Then I will start the truck, and it will idle really rough. The other 50% of the time, the pump will run for about a second, shut off, I will start the truck and it will idle just fine. It doesnt matter which tank I start from. Anyone have any ideas of where to start chasing my problem down?
94 F150 4x4 302 with dual tanks.
Intermittenly, the truck idles really rough. I can tell when this is going to happen before I start it up as the fuel pump will run continuously. Usually, it runs for about 1.5 seconds before I start the truck. 50% of the time I will turn the key to the on position, prior to a full start, and the fuel pump will start to run, but it will run contiueously. Then I will start the truck, and it will idle really rough. The other 50% of the time, the pump will run for about a second, shut off, I will start the truck and it will idle just fine. It doesnt matter which tank I start from. Anyone have any ideas of where to start chasing my problem down?
Elder User
Joined: Nov 2005
Posts: 834
Likes: 0
The time the fuel pump runs, and the idle are both controled by the ECU. I'm thinking you probably have a bad ground that is ok sometimes, and sometimes not. Before I did anything else, I would clean and retighten all the grounds I could get to, and check the plug on the computer for signs of corrosion.
Good Luck Frank
Good Luck Frank
