Mechanics

RUNS RICH/NO POWER

1989 Ford F-150 • 5.0L V8 4WD Automatic • 193,703 miles

I have a 1989 f150 with the 5.0l efi/multiport injection. Recently it has been very sluggish, having no power at all, and runs so rich you can hardly breath in it. I replaced the o2 sensor in the manifold, and checd the plugs and they seem to be fine with good connecton. It has no power when trying to take off, and once in a while when driving at 55 it will free up and run fine for a couple of minutes and then just loose power again. I drive maybe 30 miles a day and use 1/2 tank of gas, also in town at stop signs it will die if I dont keep giving it throttle. It will not idle on its own whatsoever. I need to know what the next step to take on fixing this ol girl cause she is my only mode of transportation.
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1989f150
March 10, 2014.




Check fuel pressure first autoparts rent gauge

Tiny
Hmac300
Mar 11, 2014.
Tested fine, right on specs

Tiny
1989f150
Mar 11, 2014.
Clean the throttle plate with choke cleaner on both sides an diac hole. I'd think the fuel pressure would be off due to maybe regulator screwing up so check if it's vacuu operated ofr a line off etc. Scan for codes and check intake vacuum if 15" or below suspect clogged exhaust
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Tiny
Hmac300
Mar 12, 2014.

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