94 F150 4.9 sudden terrible idle
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Junior Member
Joined: Aug 2017
Posts: 2
94 F150 4.9 sudden terrible idle
Ford friends, I started my 94 F150 Tuesday, and I thought the motor was going to shake right out of the truck. The Idle was, well unbelievable, and I have never heard my K&N filter drawing that much air. So, I looked at the major 3.Replaced MAP sensor, IAC valve, and just now TPS. A little better but still hammered ****. Son bringing home fuel filter. Any Ideas????
TY
Rick
TY
Rick
Senior Member
Joined: Jun 2010
Posts: 16,567
Sometimes my lite comes on upstairs, most of the time its pretty dark up there !
You didn't say how it runs at higher RPM.
If it smooths out at a higher RPM , I would suspect a vacuum leak.
If it stumbles much the same , water in the fuel?
If it was in a very damp wet location , check under the dist cap for moisture.
There is always the possibility it has jumped a tooth with timing.
You didn't say how it runs at higher RPM.
If it smooths out at a higher RPM , I would suspect a vacuum leak.
If it stumbles much the same , water in the fuel?
If it was in a very damp wet location , check under the dist cap for moisture.
There is always the possibility it has jumped a tooth with timing.
Last edited by hanky; Aug 18, 2017 at 03:38 PM.
Thread Starter
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Junior Member
Joined: Aug 2017
Posts: 2
Hanky,
Sometimes my lite comes on upstairs, most of the time its pretty dark up there !
You didn't say how it runs at higher RPM.
If it smooths out at a higher RPM , I would suspect a vacuum leak.
If it stumbles much the same , water in the fuel?
If it was in a very damp wet location , check under the dist cap for moisture.
There is always the possibility it has jumped a tooth with timing.
You didn't say how it runs at higher RPM.
If it smooths out at a higher RPM , I would suspect a vacuum leak.
If it stumbles much the same , water in the fuel?
If it was in a very damp wet location , check under the dist cap for moisture.
There is always the possibility it has jumped a tooth with timing.
Hanky, TY for response. High RPM motor smoothes out. Changing fuel filter aftet verk. Will check vac system.
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