Engine idels to fast after replacing head gasket.


Asked by Oct 22, 2007 at 06:45 PM about the 1992 Ford F-150 S LB

Question type: Maintenance & Repair

After replacing the head gasket in my 1992 F150 3.9L 6 cylinder, the first time I started it the engine raced like it was at full throttle and the temperature gage does not show temperature. I can't time it or determine what happened to the temperature gage. Any help would be appreciated.

3 Answers

did you get all the vacume hoses back on and in correct order,as for temp did you plug wire back in for temp guage.


Yes, sounds like a vacuum problem, and the temp gauge may just be a disconnected wire.


The computer depends on the temp sensor to control fuel and idle . There are 2 sensors on the vehicle for sure , one for the dash gauge and one for the computer.....make sure they are plugged in and connections are not corroded/ rusty/ green !! Vacume leaks , and or improper vac hose connections will cause the engine to race . Low coolant level will affect idle speeds too , make sure you get in as much coolant as possable and bleed out all air locks in system. Make sure you don't have the throttle stuck open , or the cables binding as they will hold open the throttle plate and cause the engine to race too !!

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