Question about 1988 Ford F 150

1 Answer

Engine misses 4.9l

Have now replaced - the engine control module, and ingnition control module, plugs, wires and distributor cap and fuel filter.
It does run better than it did, but I still find that when at speed - say 40mph and in 4th gear ~2000rpm, after a minute or two down the boulevard, it will miss/**** a few times and smooth out - be OK for a while and do it again.
I have fuel gauge issues (Dual Tanks) where the needle sometimes is bouncing around - I know that the pump and tank guage are one unit - can it be a fuel pump? It doesn't matter which tank I am on either. Seems odd that both pumps would go but????? Am I right that there are 3 pumps a low pressure in each tank then a high pressure on the frame rail so supply the EFI?

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  • d_nesting May 15, 2009

    fuel filter is new - same time as ECM and ICM

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Here is the next step, you buy a fuel pressure test gauge from a parts store and hook it up at the test port at rear of the engine on top, it looks like a tire valve but metal, will have a plastic cap on it ( or should), test the fuel pressure should be around 50 PSI at idle. How is the fuel filter, ever been changed? it is due every 30,000 miles

Posted on May 13, 2009

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