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

Why does my truck make a popping sound?

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Old Aug 5, 2010 | 11:38 PM
  #1  
dieseljunkie1996's Avatar
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Default Why does my truck make a popping sound?

When i mash the throttle it pops out the exhaust and dumps a lot of blueish/white smoke and has no power. It does it really bad when its cold and a little when its up to normal operating tempature. Its kinda imbarrasing any help. Thank you
 
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Old Aug 6, 2010 | 12:05 AM
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Dr. Evil's Avatar
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Im not sure about the popping sound. But have you ever changed your overflow valve? I would do that first - use an original Bosch overflow valve.

It could also be slipped timing. if the overflow valve doesnt fix it - have your injector pump timing checked.




Some reading for you:

Ram Diesel Injector Pump Problems


TSB 14-07-96 Rev. A


Welcome BTW
 

Last edited by Dr. Evil; Aug 6, 2010 at 12:10 AM.
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Old Aug 6, 2010 | 12:21 AM
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oglejust's Avatar
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low fuel pressure, slipped timing.. just some stuff 2 think about
 
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Old Aug 6, 2010 | 04:52 AM
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94 12valve's Avatar
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air leak in the fuel system will also cause a poping sound
 
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Old Aug 6, 2010 | 07:48 AM
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BRE's Avatar
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classic sign of slipped timing but all the others will result in the same thing.
 
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Old Aug 6, 2010 | 08:27 AM
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mine does it at max rpm??? always thought it was fuel cut. Did it before and after i got my pump timmed and sounds a little differently with new turbo??

---AutoMerged DoublePost---

i bought valve springs but have not put them in yet
 

Last edited by BLACKSMOKEMOAN; Aug 6, 2010 at 08:27 AM. Reason: Automerged Doublepost
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Old Aug 6, 2010 | 11:29 AM
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blackout94's Avatar
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timing or a fuel missfire
 
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Old Aug 6, 2010 | 07:16 PM
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dieseljunkie1996's Avatar
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a couple of local people here in town told me there was a check ball with a spring in the pump and the spring gets wore out and starves it for fuel. i dnt know what they r talking about. It has a new lift pump so i will check the overflow valve and have the timing checked.
 
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Old Aug 6, 2010 | 09:35 PM
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Mine did it pretty bad when i stomped it before i got my airdog, it would only get to about 3200 then it started popping, its because it was defueling, now it'll go all the way past 4k no problem, but it could also be timing, you should fill out your sig too, so we know what you're workin with
 
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