1986 Ford F-150

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.
October 11, 2008.

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

Oct 11, 2008.