Question about 1991 Ford F250

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Ford f-250 diesel

Where is the timer relay located at truck wont start after it sets for awhile changed glow plugs cant find relay anyone please help

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If the timer you have looks like a starter relay it is located at the back of the engine close to the fire wall. There is a little plastic cover over it that you can pry off with a screw driver. It has 2 large and 2 small wire posts on it. I had to replace the one on my brothers truck the other week. Hope this helps.

Posted on Jan 09, 2009

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Try looking on firewall or in the black box under the hood

Posted on Dec 27, 2008

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1991 f 350 wont stay running7.3 deisel new injecters new glow plugs new fuel filter have to put gas on a rag and cover intake starts but u put into gear and dies


Many things to check. Wonder if this work was done to alleviate problem or problem was from doing the work.

Putting gas fumes in a 21:1 compression cylinder is sure way to ruin engine.

2 possible problems are losing your diesel fuel draw from an air leak in the fuel lines and an inoperative glow plug timer.

When you change a fuel filter you lose the vacuum lock that is in the fuel lines. Some mechanics add fuel to the new filter to remove some of the air and promote fuel draw. The O rings on the injector lines are a special type which resists petroleum products. Using cheap O rings will cause problems.

Glow plug timer-there is a power Relay to the timer and the timer itself is a type of Relay. You should hear clicking noise and lights should dim as timer provides power to the glow plugs.

Other things to check would be the Vacuum pump as Diesels work differently than gas engines and require a pump to supply Vacuum. Covering the intake suggests engine needs a Vacuum draw.

Weak fuel pump. Too weak to pressurize or draw fuel. Can be measured with pressure gauges.

Really bad rings could also cause symptoms.

Would be interested knowing what proved to be wrong.

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1 Answer

Ford F250 2002 7.3 Diesel won't start


check engine immobiliser and crank position sensor . Run fault codes and replace faulty units.

Apr 04, 2013 | Ford Cars & Trucks

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2002 ford f250 7,3 diesel wont start


Sounds like it has too do with the glow plugs, and the Glow plug timer

Mar 14, 2013 | Ford F-150 Cars & Trucks

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1987 Ford f-250 6.9 liter diesel. Glow plugs are good, Relay is new, glow plugs don't work... is there a glow plug relay controller or timer that can be replaced, and what is the part's proper name?


Check for fuses first. The Glowplug timer is the proper name for the part that responds to Temperature when starting your engine. When the engine is cold, of course it is on longer and can cycle making a click and intermittently dimming the lights on your truck. When the engine is warm, your gowplugs may not even fire as the engine is using compression alone to fire up.

Also, Ford did make a Severe Weather model that kept the glowplugs on longer. If you stay in Alaska or a climate with consistent subzero temperatures you may need it.

Nov 16, 2010 | 1987 Ford F 250

2 Answers

Problems With Cold Starts.


I know for some models that Ford had another Diesel timer for the glowplugs for severe weather. This timer was meant to keep the glowplugs on longer.

I had an 87 Ford Diesel and the top wires on the timer were tight and clean. For some reason when I loosened them and retightened the wires the timer worked better.

Many truckers use a Diesel additive and usually the fuelstops have modified Diesel for cold climates. I understand there is a Cetane rating for Diesel and Premium Diesel may help.

Feb 26, 2010 | 2008 Ford F 250 Super Duty 4WD

2 Answers

7.3 l diesel wont start


Bad glow plugs and/or glow plug controller. Common issue with these vehciles. Some also have harness failures. Replace all glow plugs as a set not individually.

Mar 29, 2009 | 1991 Ford F250

2 Answers

Ford Diesel glow plug relay goes out every year since 1993


The relay should cost about $35-45. A common Ford Starter relay can be used in place of the official glow plug relay. All that is required is a relay with terminals that have 5/16 or 3/8 terminals and can carry about 150-200 amps. When all 8 glow plugs turn on, it draws about 150 amps is all. There are two relays for the 7.3 diesel. One energizes the glow plugs and the other energizes a heating element in the air intake. That one is used to help eliminate white smoke while warming up and is turned on and off by the engine computer. It is usually only called for when the temperature is 20 degrees F or lower.
Otherwise only the glow plug relay works.

Dec 30, 2008 | 2001 Ford F350 Super Duty SuperCab

2 Answers

Wait to start light not coming on and now will not warm by plug


change the relay /timer unit ,after checking the big fuses,cant tell you where unit is as never seen ford 250 ,not common here in spain .

Nov 17, 2008 | 1991 Ford F250

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