1990 FORD F-150 PICKUP, 4.9L INLINE 6
TRUCK WAS TOWED IN WITH NO POWER AS SYMPTOM. TRUCK WOULD NOT RUN AT IDLE. OWNER STATED THAT TRUCK HAS SAT IN PASTURE FOR QUITE A WHILE. WE STARTED WITH THE FACT THAT THE FUEL WAS VARNISH. WE CLEANED THE TANK, REPLACED FUEL FILTERS, FLUSHED THE LINE AND CLEANED THE INJECTORS.FUEL PRESSURE IS AT SPEC. PLUGS WERE FOULED AND WERE REPLACED. IGNITION CONTROL MODULE WAS FOUND CRACKED AND WAS REPLACED. DISTRIBUTOR CAP AND ROTOR WERE REPLACED. REPLACED IAC. ALL VACCUM LINES WERE CHECKED AND REPLACED. CYLINDERS SHOW NO IMBALANCE.
TRUCK WILL START UP NOW AND RUN AT IDLE. WHEN IDLE IS INCREASED, THE ENGINE BOGS DOWN AND HAS NO POWER. IF A VACUUM LEAK IS INDUCED, ENGINE WILL RUN BETTER BUT STILL SLUGGISH. WHEN PUT IN GEAR, ENGINE DIES.
ANY SUGGESTIONS?
LEO RAMP
RAMP AUTOMOTIVE
LAMPASAS, TX
1990 Ford F150 - 4.9L No Power
- steven kiser
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Re: 1990 Ford F150 - 4.9L No Power
critters. check for restrictions in the exhaust and nibbled hoses and wires. i had one that the plenum was plugged with debris from nests. a quickie would be pulling the 02's and seeing what happens.
never argue with a fool, they'll drag you down to their level and beat you with experience
- brianp87
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Re: 1990 Ford F150 - 4.9L No Power
Yes checking exhuast for restrictions should be one of the first things
- steven kiser
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Re: 1990 Ford F150 - 4.9L No Power
i just had a flash, check the wire that has the timing shunt in it. if that's broken the truck will barely run. oh ya, no wise a** remarks about "steve having a flash". i've also run into fords that have sat for a while having all the injectors stick. sounds like a few that i've had.................good luck. if it needs injectors check pricing with "jeggs". i've had great sucess with them for pricing and performance.
never argue with a fool, they'll drag you down to their level and beat you with experience
- fortknoxx
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Re: 1990 Ford F150 - 4.9L No Power
flaming fur balls are a sight to see.
T-N-T (Tina Nuse-Tolar)
Gone but not forgotten...Camper Bob's
609-760-7079 Cell
Gone but not forgotten...Camper Bob's
609-760-7079 Cell
- steven kiser
- 5K Holy Smokes Contributor
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- Joined: Fri Jul 06, 2007 4:58 am
- Location: eastern ma.
Re: 1990 Ford F150 - 4.9L No Power
amen to that.
never argue with a fool, they'll drag you down to their level and beat you with experience