12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

Cummins engine start up

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Old Oct 14, 2015 | 09:06 AM
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Default Cummins engine start up

Iv got a 96 12 valve 5 speed just recently replace the Injection pump just a stock rebuilt pump. On start up the motor turns two or three times before fireing is this normal? Iv herd a 12v should start just by bliping the key ?
 
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Old Oct 14, 2015 | 09:29 AM
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In my experience the first gens start up with just a blip, the second gen 12 valves take a little longer, but no too long. How did your truck start before?
 
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Old Oct 14, 2015 | 09:43 AM
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When I bought the truck it cranked forever which is why I replace the Injection pump, I got the rebuilt one installed it it fired up a tad bit quicker than the pump I have now but a barrell kept sticking so I had to pull the pump again and give it back to the place Ihad rebuild it, so if something is wrong with the pump again I feel they would have caught it.
 
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Old Oct 14, 2015 | 11:45 AM
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Any smoke on start up?
 
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Old Oct 14, 2015 | 12:13 PM
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Originally Posted by Jet A Fuel
Any smoke on start up?
Nothing noticable maybe a tiny bit of smoke on a cold morning
 
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Old Oct 14, 2015 | 12:22 PM
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any excessive engine blow by out of the dip stick tube or oil filler cap?
How many miles on this engine?
Can you elaborate on it cranks two or three times to get it started. Does this mean the engine doesn't start during the first key cycle or just that the engine turns several revolution before it starts?
 
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Old Oct 14, 2015 | 01:01 PM
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Originally Posted by Jet A Fuel
any excessive engine blow by out of the dip stick tube or oil filler cap?
How many miles on this engine?
Can you elaborate on it cranks two or three times to get it started. Does this mean the engine doesn't start during the first key cycle or just that the engine turns several revolution before it starts?
engine cranks for about two to three sec before firing, motor has 176k and couldn't really tell of any blow by I couldn't smell any diesel fuel in the oil when I changed it
It could be totally fine I was just wondering if this is normal and I'm just paranoid or I have myself another problem
 
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Old Oct 14, 2015 | 03:45 PM
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could be a small fuel leak down. park the truck down hill and see if that helps it start quicker. if it does check all fittings for dampness. if not timing can cause a harder start. my sled pulling truck timed at 30 degs. is a bear to start
 
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Old Oct 14, 2015 | 06:39 PM
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Originally Posted by Mopar00
Iv got a 96 12 valve 5 speed just recently replace the Injection pump just a stock rebuilt pump. On start up the motor turns two or three times before fireing is this normal? Iv herd a 12v should start just by bliping the key ?
two or three cranks is pretty good IMO I would not worry at all about that.

Originally Posted by diesel pap
could be a small fuel leak down. park the truck down hill and see if that helps it start quicker. if it does check all fittings for dampness. if not timing can cause a harder start. my sled pulling truck timed at 30 degs. is a bear to start
My 94 will crank all day with out a fire unless either is used .... than you have to keep it running with either till she warms up
 
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Old Oct 15, 2015 | 05:16 AM
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I would try the fuel leak down and check the injection pump timing and maybe have a compression check done. 175k on injectors is a pretty good life span in my opinion. But if your not puffing smoke on start up it may just be a leaking down ip.
 
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