Question about 1992 Ford F150 SuperCab
1) Have a look at the starter relay. Pull it out and ease the cover off and then check out the state of the solder joints. If any are dry and or there are signs of annular cracking around any of the power pins simply reheat with soldering iron to make good. 2) Check out your idle air control valve. Clean the throttle body interior and passageways to and from the IAC. Check that the valve is free to open and that it opens when at idle. 3) Check out your fuel pressure regulator (FPR). It sits on the end of your fuel rail. When the car is idling pull the vacuum line from it. The engine revs should pick up for a few seconds before running roughly. If you do not get this response apply vacuum to the FPR and this should cause the engine revs to drop. If by applying suction you pull fuel throught he vacuum port then the FPR needs changing 4) Lastly check all vacuum lines. Spray suspect areas with WD40 and if there is a leak there the engine will jump slightly in revs.
Posted on Oct 13, 2010
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Posted on Jan 02, 2017
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