20 Most Recent 1990 Ford F350 Questions & Answers

Check to make sure the power line going into the switch is hot. If you have power going into the switch and no lights then you need to replace the headlight switch a very simple thing to do.

1990 Ford F350 | Answered on Dec 11, 2020

Check 4 bad earth

1990 Ford F350 | Answered on Dec 22, 2017

as the engines are the same , it should fit straight in
items to consider is the drive shaft slip joint size and spline numbers

1990 Ford F350 | Answered on Dec 18, 2017

Long shot, how about the air cleaner?

1990 Ford F350 | Answered on Sep 26, 2017

Yes, cracked manifold can let oxygen in, which tells the pcm to enrich the mixture. You are probably running rich. Really bad for gas mileage too. Replace the manifold.

1990 Ford F350 | Answered on Jul 23, 2017

It sound like a bearing issue. I would recommend checking oil pressure. This should be done both cold and hot. Allow engine to cool over night, you can get an inexpensive oil pressure tester at most parts stores. Remove the oil pressure sender near the oil filter. Attach the oil pressure tester to this port. Start and run engine. Cold oil pressure should ideally be around 40psi, with hot oil pressure around 20. If the pressure drops significantly or never really is satisfactory this may indicate a larger issue. It could have a bad or restricted oil filter. It could also have excessive clearance on the bearings, indicating wear and the need for new bearings.

1990 Ford F350 | Answered on Mar 07, 2017

Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem.
Best Manuals

1990 Ford F350 | Answered on Dec 12, 2016

The multi function switch is a string possibility.

1990 Ford F350 | Answered on Oct 01, 2016


1990 Ford F350 | Answered on Aug 19, 2016

Diesels do not have carburetors

1990 Ford F350 | Answered on Apr 19, 2016


How to replace a ring gear on older ford truck

remove fly wheel get a torch heat up the ring gear and smack with a hammer tell it comes off, to re-install heat new ring gear and hammer on that's it.

on Mar 27, 2015 | 1990 Ford F350

governor pressure to high,
possible causes
governor is sticking
high vacuum at modulator
bad modulator
engine rpm to high
miss aligned lincage

1990 Ford F350 | Answered on Mar 25, 2015

They run on regular. Sometimes I put in midgrade every 3rd time I add gas.

1990 Ford F350 | Answered on Jan 03, 2015

Check auto choke fast idle,free up choke butterfly.

1990 Ford F350 | Answered on Jul 28, 2014

Most likely the IGN Module in the Distributer.. it is the thing that the wires are attached to under the distributer, usually gray in color.. could be the coil, could be not getting a 12v single from the ign switch to the coil.

1990 Ford F350 | Answered on Jun 30, 2014

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