Help with 1990 Ford F-150 please.


Old 04-27-04, 07:38 PM
Thread Starter
Join Date: Nov 2002
Location: MI
Posts: 127
Help with 1990 Ford F-150 please.

Vehicle: 1990 Ford F-150, 4 wheel drive, 351 W, 4speed auto AOD trans. It has about 25,000 miles on a new Ford motor. About 130,000 on the vehicle itself.

Problems: It has a slight misfire or surging feeling at highway speeds. Seems to idle fine, when you rev it up in park it seems to be smooth, just when it's cruising along at highway speeds it seems as though it wants to surge backwards, or misfire. About 5000 miles ago one of the spark plug wires shorted out against the exhaust manifold, which of course made it run very bad. When I got home and found out what happened I replaced the wire. Could the shorted wire have damaged something in the distributer to make it miss like this? Does the distributer have a pick up coil that could easily be replaced?

The truck also has very worn ring and pinion gears. Is changing them a simple swap job or is it something better brought to a garage? It's been a few years since I have done that type of job and I'm not sure what's involved in it.

The gas mileage on this truck sucks too. I'm getting about 10-11 mpg. Could it get better than this? The truck has 3.55 gear ratio.
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Old 04-30-04, 04:23 PM
Join Date: Apr 2002
Location: Pittsburgh,Pa
Posts: 2,417
If the rear differential needs replaced swap the whole rear axle assembly not just the gears and carrier.The misfire have you rechecked the ignition wires?You may also have a lockup torque converter problem making the (surge)feeling.Yes the pickup in the dist is fairly easy to change if needed.

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