I have put on a new fuel pump new coil new cap pugs pug wires new ecm new distributor and the truck runs very ruff and is missing bad the motor is new all the way through i am at a loss.
Hey i recently bought a 1990 ford 5.0L 5 speed. Clutch safety switch was not working proper, bypassed the safety switch, truck was running rough but when you take the wire off of the small top post of the solenoid and apply it to the positive terminal of the solinoid it runs well. After tracing the wire i found that by applying that wire to the positive termina i get power to what i believe is the "run" wire in the TFI plug which is plugged into the distributor. it is the third wire from the right side of the plug when your looking at it with it unplugged facing yourself. Still trying to track down where this wire runs to but if i find out ill let you know sounds like we may have the same problem
SOURCE: 1988 ford f150 running rough
Might want to change o2 sensor's, If they are not sending the right single its tell the computer to dump fuel. 1988 was using a fuel density system.
(1989 came out with Mass air flow system)
Check this
I think it might have a TFI module that's not working right. Located under distributor. Its gray and about 4" long and if equip, you need a 4 or 5.5 mm tool to unbolt it. This was a common thing back in the 80's. Its been so long I can't remember if the 4.9 straight 6 had it or not.
T- Thick
F- Film
I- Ignition module
SOURCE: 1990 Ford F150 - V8 no spark
Just check the Haynes book for that model and they tell you the firing order and how can you start putting yours spark plugs wires on the cap. You can check the book at the library or buy it at autozone or can go to autozone.com and look for electric diagramas.
SOURCE: 1990 F150 Fuel pump just replaced but wont turn on
Replace the fuel pump relay. And if your truck has dual tanks there's three fuel pumps, one in each tank and another secondary fuel pump.
SOURCE: 1990 Ford Bronco, 302 v8 (5.0), AOD Auto
is your computer inside the engine compartment? if so i am geussing it got coolant on it also and is keeping the injectors open and running the pump when it should be off.
SOURCE: Ford F150 engine backfiring, running/idling rough
I Have a 1999 ford f150 4.6 that back fires and is just running really ruff when idling alot of nack fire a sord of like a pulse going on what is my problem?
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