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post #1 of 7 (permalink) Old 01-05-2009, 10:48 PM Thread Starter
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starting question.

A buddy of mine has a 99 If you hop in the truck (desnt mater how cold it is..) IT wont fire... all it does is try and try.... cycle the key it fires right up.....

Or you can just cycle the key twice and if fires up... his pumps took a crap on him so we replaced them and it still does it... Its not hurting anything I was just wondering WHY his does it but no other one I know does it..?

Jordan

95-dodge 2500 built to the hill... - sold to litle brother
03- stroker 6.0 studs and basic BS

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post #2 of 7 (permalink) Old 01-05-2009, 10:52 PM
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Sounds like glow plug issue. and on one heat cycle they are not getting hot enough.

are they originals?

-Steve-
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2007 5.9
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post #3 of 7 (permalink) Old 01-05-2009, 11:09 PM
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Quote:
Originally Posted by blackcloudCTD95 View Post
A buddy of mine has a 99 If you hop in the truck (desnt mater how cold it is..) IT wont fire... all it does is try and try.... cycle the key it fires right up.....

Or you can just cycle the key twice and if fires up... his pumps took a crap on him so we replaced them and it still does it... Its not hurting anything I was just wondering WHY his does it but no other one I know does it..?

Could be a grid heater issue but doesn't sound like it. Cycling the key on and off as you describe may be commanding the ECM into CEL/malfunction code analysis which could conceivably come into play here but I am doubtful of this as well. How fast is your friend cycling the key switch and in what fashion.

If he is cycling the key switch twice and each time he turns the key to the on position he waits for the wait to start light to go out and does this twice, it would stand to logic and reason that it does start especially when it is very cold out and the engine is cold. The grid heaters are operated by the ECM with senses intake air temp via the IAT sensor. When the IAT sensor senses less than approx. 60 degrees F; the grid heaters are commanded to active prior to each start attemp, and cycle on and off until intake air temp as sensed by the IAT sensor is approx. 60 F.

Is that clear as mud? The Cummin 5.9 B series engine does not employ glow plugs, they use a grid heater system.

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post #4 of 7 (permalink) Old 01-05-2009, 11:10 PM Thread Starter
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Quote:
Originally Posted by SparkyLV View Post
Sounds like glow plug issue. and on one heat cycle they are not getting hot enough.

are they originals?

No glow plugs on a cummins.... we dont need em..

Jordan

95-dodge 2500 built to the hill... - sold to litle brother
03- stroker 6.0 studs and basic BS

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post #5 of 7 (permalink) Old 01-05-2009, 11:14 PM Thread Starter
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Could be a grid heater issue but doesn't sound like it. Cycling the key on and off as you describe may be commanding the ECM into CEL/malfunction code analysis which could conceivably come into play here but I am doubtful of this as well. How fast is your friend cycling the key switch and in what fashion.

If he is cycling the key switch twice and each time he turns the key to the on position he waits for the wait to start light to go out and does this twice, it would stand to logic and reason that it does start especially when it is very cold out and the engine is cold. The grid heaters are operated by the ECM with senses intake air temp via the IAT sensor. When the IAT sensor senses less than approx. 60 degrees F; the grid heaters are commanded to active prior to each start attemp, and cycle on and off until intake air temp as sensed by the IAT sensor is approx. 60 F.

Is that clear as mud? The Cummin 5.9 B series engine does not employ glow plugs, they use a grid heater system.

I left some thing out.. IF you DONT wait to start... itwont start.. if you wait.... start...... cycle the key again waiting...... it fires right up.... It does this weather its hot or cold( motor) you could driv it for an hour strait and walk into the gas station, an you would have to cycle the key...

So you think it could be the IAT?

Jordan

95-dodge 2500 built to the hill... - sold to litle brother
03- stroker 6.0 studs and basic BS

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post #6 of 7 (permalink) Old 01-05-2009, 11:15 PM Thread Starter
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BTW there are no codes, running or cranking......

Jordan

95-dodge 2500 built to the hill... - sold to litle brother
03- stroker 6.0 studs and basic BS

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post #7 of 7 (permalink) Old 01-06-2009, 06:33 PM
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Wow I thought these older cummins used glow plugs lol!

Thought that grid heating system was just on the newer ones but shows how much I know.

-Steve-
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