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Old 10-22-2018, 05:58 AM
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Default Cold start problems

Hey guys, having some issues with my excursion. Last year it started. When it gets to 50 degrees or colder the truck has a really hard time starting. After plugging it in it will start. Iíve switched to 5w oil, new glow plugs, glow plug relay, valve cover harness and new hpop. The batteries have been checked and are good. 750 cold cranking amps.

This past weekend of course the temps dropped and truck wouldnít start. At this point Iíve debated on taking to a shop. But would rather not. Could the starter just be weak in the cold weather? Any help would be awesome.


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Old 10-22-2018, 07:54 AM
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Are you sure the glow plugs are really turning on? Did you check the relay is
really activating?
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Old 10-22-2018, 08:58 AM
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I may have missed it but could you explain better the "will not start" issue it self? As in, Does it turn over fast but doesn't crank, or turns over sluggish like weak battery's would, or doesn't turn over at all?
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Old 10-22-2018, 11:52 AM
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Alot of white smoke?

Injectors cackling?
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Old 10-26-2018, 05:18 AM
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If it does start there is some white smoke initially. The crank will start off strong then die down. The batteries arenít but 6 months old. Iím thinking the starter could be going or weak. Harder to start when itís cold. As far as the relay I havenít a clue how to test the excursion style relay. Itís an inclosed box. It is brand new though.


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Old 10-26-2018, 06:12 AM
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Glow plug control module. You'd have codes if there was an issue there.

You need cranking speed. Fix the battery issues, get a high torque starter, clean grounds at block and frame
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Old 10-26-2018, 02:19 PM
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I have that module in my 2000 CA 7.3. Have a voltage meter plugged into the lighter socket
or something, note the voltage with everything turned off. Turn the key on and if the
voltage drops about two volts you know that plugs are turned on. Now .. if all if them
are working is another thing.

Mine throws a code, but it is from the missing intake heater
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Old 10-26-2018, 03:11 PM
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Before spending a bunch of money, you need to do a simple thing. Compression test.
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Old 10-28-2018, 08:23 AM
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It doesnít have any blow by. Only smokes on initial cold start then nothing after.


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Old 11-12-2018, 12:57 PM
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Update. Low crank turned out to be bad starter. When I swapped with high output I found half the positive post was broke. Which completely broke off when removed it. Borrowing a scanner to check both opt and Icp to be sure. I have a feeling the injectors might be the issue.


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