1986 Ford F-150



October, 11, 2008 AT 12:24 PM

Engine Mechanical problem
1986 Ford F150 V8 Two Wheel Drive Automatic

My Dad has a 1986 F-150 5.0 (FI) and he is having problems with the engine. When he drives to the nearest store 3 miles away after turning off the engine it will not start back up till the engine cools down. He has noticed that if he drives 1 mile the engine will trn back on after 5 minutes but the longer the drive the harder it gets to turn on (until it cools down). He has taken it to a mechanic and they cannot find the problem.

Can someone please give us some ideas


Rick C.


1 Answer



October, 11, 2008 AT 12:47 PM

When it will not start do below to determine if its fuel or spark

Get a carb cleaner and spray into the carb or the throttle body on an EFI. Did it start and die? If not disconnect a sparkplug wire or 2 and ground it to the engine -have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel problem, check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, distributor pick-up coil, ignition control module, cam and crank sensors- Note: If it doesn't apply disregard it

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