99 Won’t start when cold. - Dodge Cummins Diesel Forum
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post #1 of 5 (permalink) Old 12-18-2019, 11:03 AM Thread Starter
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99 Won’t start when cold.

Ok so I’m having issues with my truck starting when it’s cold. It has been getting pretty cold at night. Single digits for the last week. The guy I got this truck from was setting up twins, so it doesn’t have a second battery. Just one optima red top. Starting to wonder if I’m not getting the cold cranking amps I need. But I’ve also left a battery charger on it at night hoping it would start that way. Had no luck with that either. Tried pulling out the relay to my fass thinking maybe the vp was getting to much pressure. When I do finally get it started it smokes like a train. Idk if a new grid heater would help me or maybe the engine is just tired. Anyone have any advice?

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post #2 of 5 (permalink) Old 12-18-2019, 01:12 PM
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First are the grid heaters working or not? Both? Yes maybe not enough amps, especially after grid heaters uses a lot. Probably not excessive pressure if when cold or it just started with no changes done just prior. Any problem at all when warned up or on warmer nights?
What did you do to get it to start? Is cranking speed a little slow?

99 2500, Quad cab, 4x4 47RE, BD pressure lock on it, small BD 90/140 chip on the VP 44 connection plug, 17" 3rd gen wheels. 3.55 diffs. Ruenell front bumper and warn winch, Rancho adj shocks. 663k miles.
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post #3 of 5 (permalink) Old 12-18-2019, 02:24 PM Thread Starter
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Originally Posted by bigfish95971 View Post
First are the grid heaters working or not? Both? Yes maybe not enough amps, especially after grid heaters uses a lot. Probably not excessive pressure if when cold or it just started with no changes done just prior. Any problem at all when warned up or on warmer nights?
What did you do to get it to start? Is cranking speed a little slow?
The wait to start light does come on, but idk if that means the grid heaters are working or not. Is there a way to test them? Also yes sometimes I Have a little issue with it when it’s ran for awhile and I go to start it again. It acts like it has a little air in the fuel lines. It will crank over for a minute then I’ll turn it off and cycle the key another time is fires right up. It was would start up fine on warmer nights, but I haven’t had any warmer nights for awhile now. Cranking speed seems normal until I run the battery down. Only way I could get it to start was jumping it from my semi.
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post #4 of 5 (permalink) Old 12-19-2019, 02:23 AM
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OK here are some thnigs you can do to test dome stuff.
First watch the for the wait to start light to come on EVERY time as soon as you turn the key to ON.

If the grid heaters are working the voltage will drop to the mark on far left of voltmeter on dash. The ECM cold be turning them on but if the voltage does not drop the relay is not working. But if the issue is happening when warm it is not bad grid heaters. An air leak in return line usually causes hard or no start after sitting for several hours, not a few minutes.

Batteries going bad will act like what you have. It only cranks a slight bit(often unnoticeable) slower, not fast enough for compression firing of a diesel. So, have your batteries load tested disconnected and separately. Free many places.

The stating on second try is often a symptom of a bad ECM, but it also would not have the WTS light come on immediately the first try.
A delayed WTS light is always indicative of a bad ECM.

99 2500, Quad cab, 4x4 47RE, BD pressure lock on it, small BD 90/140 chip on the VP 44 connection plug, 17" 3rd gen wheels. 3.55 diffs. Ruenell front bumper and warn winch, Rancho adj shocks. 663k miles.
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post #5 of 5 (permalink) Old 01-03-2020, 02:17 PM
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When it is really cold I just cycle the wait to start sequence twice. Only do that if your batteries are good and charged tho.
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