Glow Plugs???
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Senior User
Joined: Nov 2004
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From: Long Island
Glow Plugs???
my 2000 f350 7.3 is taking alittle longer to start on most days now and it seems to have to warm up a bit to run at highway speed without the engine seemimg to kinda flood from too much diesel..does this seem like a glow plug issue and how are they to change?
Hotshot
Joined: Dec 2006
Posts: 14,069
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From: Melbourne, Ky
I'll take a stab at it. You describe a glow plug issue, but not necessarily replacing the glow plugs is necessary. You might have a Glow Plug Relay going bad. You have 2 relays on top of the engine, passenger side. Unfortunately, I don't remember which one goes to the glow plugs, and which one goes to the Air Intake Heater. Once you find the GPR's, following the wires should be easy to figure out which one goes to the Glow Plugs and which one goes to the Air Intake Heater. Once you figure that out, use a screwdriver and cross the 2 big terminals on the GPR for about 30 seconds and then start your truck. BTW, do you get a WTS light? And if so, how long does it stay on? Actually, check this first. If the light goes out in a couple seconds, then you likely have a GPR problem. If you do need a GPR, be sure to tell the parts guy you need a Glow Plug Relay.
New User
Joined: Jun 2010
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may just be the relay!
Hi--Check the glow plug relay on the passenger side top of the engine-- if this goes it's an easy fix 1/2 hour and $50 or so -- Glow plugs are under your valve covers-- a day job -- replace the harness while your in there!
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Senior User
Joined: Nov 2004
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From: Long Island
The WTS light will stay on for about 6 seconds or so and then goes out. Would the GPR cause the rough running until warmed up also? Actually it runs smooth..The rough running happens when I first accelerate and then take foot off the accellerator.
Post Fiend
Joined: Jun 2004
Posts: 9,293
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From: Parker, CO
Glow plugs run for a maximum of 2 minutes in very cold weather. Since it's June, I doubt temps are that low to keep the glow plugs on for very long. So if your truck is not running right until the engine temps start to come up, then it's not a glow plug issue, or even a relay.
Your problem is elsewhere. The issue is that it's going to be tougher to figure out. At this point, if you don't have codes popping up, you'll have to do some diagnostics to try and pinpoint the problem. It could be a fueling issue, or (more likely) an oil issue such as a sticking IPR.
Your problem is elsewhere. The issue is that it's going to be tougher to figure out. At this point, if you don't have codes popping up, you'll have to do some diagnostics to try and pinpoint the problem. It could be a fueling issue, or (more likely) an oil issue such as a sticking IPR.
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