HELP!!! 00 7.3L having problems starting when cold. - Ford Powerstroke Diesel Forum
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Old 12-05-2010, 05:00 AM
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Exclamation HELP!!! 00 7.3L having problems starting when cold.

New to the board folks and looking for some advise. I have 00 7.3l that's having problems starting when ~cold. First of all when I say cold it's not cold outside, 50-70 degrees. I replaced both batteries, new alt, new battery cables, 4 new glow plugs (drivers side). I checked the GPR and it's good.
Here's what happing. I let it sit for 2 days and when I turned the key to Aux. the "wait to start" light comes on as it's suppose to. I noticed the battery cluster gauge goes to ~13 the drops to ~10. When the "wait to start" light goes off I try to start it and it seems like a large draw it taking from the batterys. Very sluggish. With the new equipment this thing should fire right up right?

Now, I plugged it in for 2 days (70 degrees outside) and tried it last night and when turned to Aux. position the battery cluster went to ~13 and didn't drop. "Wait to start light" turned off and she fired up.

My question is why does it fire up once heated and not at a "cold" start. Also, it cranks over fine when I drive it around town.. long as it's warm.

I like doing most repairs myself because I learn from it and can share my experiences with others but I'm far from being a mechanic on diesels. Also, it's easier on the pocketbook.
What am I missing here? I've read things about the PCM, but I have a wait to start light and it seems to be working fine.

My truck has 150k on it.

Any help will be greatly appreciated
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Old 12-09-2010, 04:24 AM
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Anybody out there with suggestions? I have the same problem
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Old 12-09-2010, 05:07 AM
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Sounds like a bad glow plug relay.
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Old 12-09-2010, 05:21 AM
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That's what I thought initially also... but after checking it, it showed to be good. It cycled like it should and turned off after a few minutes.
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Old 12-23-2010, 12:16 PM
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Did you fix problem yet?? I'm having same exact problem
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Old 12-23-2010, 02:29 PM
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Troubleshooting GPR & GP's

i would double check the relay with the above posted procedure. even if the outside temp. is not cold a diesel still needs glow plugs on a cold start. if the relay is good, check the UVC harness, connections, and ohm the glow plugs. you could also have a loose connection under the valve cover. after time the connector can come loose.
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Old 12-23-2010, 02:55 PM
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I checked everything on mine that it said to. and it still wont start when not plugged in. Im gonna change the Valve cover gaskets next I guess
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Old 12-24-2010, 05:40 AM
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No I still haven't narrowed it down. It's a nice 50 degrees today and still had issues cranking this morning. Before starting I cycled the plugs 3x's then tried to crank it over. Seemed like a large draw was being drawn on the batterys. So I stopped and tried again after a few seconds and she fired right up. I noticed some light blue smoke come out the exhaust but nothing out of the normal. I've had my truck unplugged for a few days before I started it, but plugged it back in last night.
I have not perfromed an ohm test on the plugs but I did replace all 4 on the drivers side and the ones I pulled out seemed fine. The GPR tested good but after reading some threads from others I might as well go ahead and replace it with a new one and see what that does. If that don't work then I'll check the other plugs and go from there. Also my ABS light came on a few months ago so I replaced the sensor on the back axle... light is still on. Seems like when it rains it pours on me. Next week I will put on a new GPR and post the results. This ABS light will be my next project. Let me know fi you find anything different on your end as well.

Wishing all a Merry Christmas for I'll be stuck here at work.
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Old 12-24-2010, 06:06 AM
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I changed the GPR already. SO I'm gonna go with new GP's and UVC harness next. Mine doesn't smoke or anything. Just wont run unless I plug it up for a couple hours
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Old 12-24-2010, 06:26 AM
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Glow plug relay wire harness
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