Question about 1990 Ford F150
1990 F150 5spd man. EFI 4.9l six cylinder. Truck starts fine but when trying to accelerate has no power like its starving for fuel. Could this be the throttle position sensor not working? I've already changed the fuel filter and put new plugs in.
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Posted on Jan 02, 2017
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)
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.
I- Ignition module
Posted on Apr 24, 2009
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