Question about 2002 Ford Super Duty F 550

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How to change glow plugs - 2002 Ford Super Duty F 550

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On the 7.3 power stroke, you have to take off the valve covers. they are in side next to the injectors. pull off the wire to the glow plugs and use a 10mm deapwell 3/8 drive socket tto srcrew them out.

Posted on Oct 02, 2010

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Posted on Jan 02, 2017

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What Year Make & Model do you have? Don't go & Change Your glow plugs tell you know what the problem is. Don't throw $$ away on something that could be good. Sounds to Me you other problems than glow plugs. Need more info. Was your engine's light on prior to this problem if so there could be some codes to indicate what the problem is!

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Getting a P1391 error code on my 01 Caravan, Changed PCM Sensors, wires, plugs, EGR, Whats Next? Please


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    Both DTCs P1391 and P1393 together will set when the monitor indicates that all eight glow plugs are not being powered. An open in all glow plug circuits, the glow plug relay, glow plugs, fusible links or all three monitoring circuits could be the possible causes.
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I have change the glow plug relay its brand new bt i didnt change the glow plug will that cause it not to start


The operatoin of the glow plugs heat up the combuston chamber before turning over the engine. ONce the fuel hits the combustoin chamber , The fuel will ignite.

The diesel engine only runs on air and fuel .

The glow plugs are basically a resistor that heats up the combustion chamber or pre combustion chamber.

So if the glow plugs are getting power now that the relay is change out , Yes the glow plugs have a major roll in starting the engne.

I hope this was helpful

Mar 26, 2009 | 1992 Ford F250

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How do you change the glow plugs and relay in a F350 1997


Hello, here is the proceedure. Any questions please ask. Good luck. CAUTION The red-striped wires on the 1994-96 DI Turbo engine carry 115 volts DC. A severe electrical shock may be given. Do not pierce the wires.
  1. Make sure the ignition switch is OFF.
  2. For 1994-96 engines, remove the valve cover.
  3. Disconnect the wire connector from the glow plug.
  4. Using a 10mm deep socket, with enough clearance as to not break or bend the wiring connector, unscrew the glow plug from the manifold.
To install:
  1. Place anti-seize on the threads of the glow plug and screw it into the manifold.
  2. Tighten the glow plug to 12 ft. lbs. (16 Nm).
  3. Plug the wiring connector.
  4. Connect the negative battery cable.
  5. For 1994-96 engines, install the valve cover.
0900c152801cd773.jpgFig. 4: Disconnect the wire, then remove the glow plugs as shown

Jan 23, 2009 | 1995 Ford F350

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