20 Most Recent 1991 Ford F350 Questions & Answers

You’re missing one part of your problem. Be sure to check your grounds.

1991 Ford F350 | Answered on Jan 14, 2018

Have you ever had the catalytic converter changed? sounds like its melted and restricting the exhaust from getting out of the engine.

1991 Ford F350 | Answered on May 29, 2017

diesels are hard to start if
the crank speed is too slow--- fully charge the batteries
the injector /s /tips need replacing---squirting not atomizing
there is air in the fuel system

1991 Ford F350 | Answered on Oct 02, 2016

Sounds like a lean misfire condition. Have you run a fuel pressure test? Should be 55-60 lbs. If pressure is ok during idle and reving, Ttry disconnecting MAF and see if any difference on accel.

1991 Ford F350 | Answered on Nov 26, 2015

Really no way to do this. A micrometer is usually part of every store that sells rotors. Even if they do not turn rotors, they still need to know if yours are safe.

1991 Ford F350 | Answered on Jan 03, 2015

Do your dash lights work if not you have a blown fuse the fuse controls both dash and running lights if this was helpful please leave good feed back

1991 Ford F350 | Answered on Dec 27, 2014

There is a check valve in the fuel pressure regulator that maintains fuel rail pressure when the engine is not running. Check it first before going after a leaky injector.

1991 Ford F350 | Answered on Oct 20, 2014

hey Tim, I have a 90 F-250 w/ plow. Did u have overheating issues before, or did u just purchase the truck? As u know u really need a heavy duty cooling system to plow. A truck purchased for plowing should have the 'plow package' option, which includes heavy duty cooling (engine, which is usually a bigger radiator) heavy duty battery and alternator, trans. cooler, heavy duty front end (for extra plow weight). So, my question is, is this a new problem, or not? My truck is set up for the plow, but I still have to watch the temp. gauge. I only have temp issues when driving down the road, plow up, not doing the actual plowing (sounds like your problem too). The plow up position blocks all incoming air to the radiator, so try driving with the plow as low as possible, and angle it all the way to one side, this will let the air flow, and works well w/ my truck. Let me know if this works for u or not. Curt

1991 Ford F350 | Answered on Jul 22, 2014


1991 Ford F350 | Answered on Nov 24, 2013

your not mentioning if this is gas or diesel allthough im hoping it's a diesel being a f350 (gas is not so practical at this size truck)
anyway if it's a diesel and you have a hot hard to start problem it's most surely your injectors getting stuck open and draining off your fuel pressure it only takes one stuck open to drain off all pressure but a 91 should have em all replaced at same time any good diesel mechanic would know how to confirm this with a few simple tests

1991 Ford F350 | Answered on Oct 30, 2013


1991 Ford F350 | Answered on Oct 22, 2013

Most likely it's a stuck / faulty thermostat.

The two brass fittings are for the automatic transmission fluid cooler.

Some models simply don't use a drain valve.

1991 Ford F350 | Answered on Mar 31, 2013

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