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Old 12-25-2013, 08:04 AM
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cold start question

Hey all,

My dad has a 95 f350 w/7.3psd, lately had developed a real cold start problem. All the glow plug components are new (plugs, harness, gasket, and relay) due to an unrelated repair performed a few months ago. Anyways, when unable to plug it in (like at work) he comes out and truck won't start. Cranks and acts like it wants to start but wont fire. Lots of white smoke out of the pipe while cranking. If the truck is plugged in it starts and runs fine, and runs smooth when warm. Im thinking possibly injector o rings? Just wondering if you smarter than me folks have any other ideas? I'm a 6.0 guy so I'm not too familiar with the 7.3 characteristics. Thanks for any advice offered. Just trying to get the old man back on the road while I'm up for Christmas.
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Old 12-25-2013, 08:12 AM
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I had a 95 7.3. Always had problems in cold weather. Kept burning up the glow plug relay. Never was able to figure out why. Used to get a year out of one, sometimes more. I carried a short jumper cable behind the seat. I would just jump the relay for about as long as the light would have stayed on, would start right up then. Was time to head on down to the International dealer for another relay. Replaced the glow plugs at 100,000, thought that might help, it didn't.
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Old 12-25-2013, 08:21 AM
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Just cause it's been replaced doesn't mean it works. That GPR is probably shot. Try a Ford or International.


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Old 12-25-2013, 09:10 AM
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Just went through this myself. Exactly the same problem... Turns out my GPR was bad.
Check with a volt meter.
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Old 12-25-2013, 10:59 AM
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Sounds like your relay is bad. Turn they key on and jump the two big posts with a wire, if it sparks, gets hot, and the truck starts up fine then your relay is bad .... OR...... The control circuit is bad.
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Old 12-26-2013, 09:54 AM
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I'll give that a shot and report back, thanks.
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Old 12-28-2013, 10:07 AM
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Ok, at 40 degrees, truck still won't start. Checked glow plug relay. Both large posts have 12v and one small one as well. Thoughts?
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Old 12-28-2013, 10:09 AM
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Quote:
Originally Posted by dieselshield View Post
Ok, at 40 degrees, truck still won't start. Checked glow plug relay. Both large posts have 12v and one small one as well. Thoughts?
Hmm. Does the tach read when your cranking? Does the engine spin fast enough?
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Old 12-28-2013, 10:09 AM
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Also, with block heater pugged in, it starts like brand new. Just fyi
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Old 12-28-2013, 10:12 AM
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Yes to both. Also, white smoke still pours out of the tailpipe while cranking
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