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Tractor Transporting Discussion Forum

Cummins missing.

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Walter Buller

05-11-2012 21:32:11
99.195.56.60



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If a 1993 12v 5.9 Cummins with about 350K on it runs like it has a miss, i.e., runs rough, no power, sluggish, what might be the problem? We have changed the fuel filters, rebuilt the pump, including a new solenoid, tested the injectors, which were working perfectly, each one popping at 3600#, put a good additive in the fuel, and scratched our heads with one hand and our butts with the other one. It still does it. Any ideas?

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Phil25

05-14-2012 14:32:08
24.222.86.151



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 Re: Cummins missing. in reply to Walter Buller, 05-11-2012 21:32:11  
not sure if this applies or not, but the air intake is clean?, if it has turbo, any chance the turbo inlet/outlet vanes are stuck/restricted?
in my case there was a non-operating intake vane, setting the fault code ,and sending a stop engine signal= runs clean, but no power, sluggish,slightly, any chance that it is down on coolant? the rad level sensor will set a stop engine code also.
just throwing it out there

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Walter Buller

05-14-2012 14:45:09
99.195.53.31



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 Re: Cummins missing. in reply to Phil25, 05-14-2012 14:32:08  
See my previous answer.



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Kip-Utah

05-14-2012 12:40:50
75.169.67.156



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 Re: Cummins missing. in reply to Walter Buller, 05-11-2012 21:32:11  
If it's missing have you notified the authorities?!!! LOL Kip



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Walter Buller

05-14-2012 14:30:03
99.195.53.31



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 Re: Cummins missing. in reply to Kip-Utah, 05-14-2012 12:40:50  
Actually, I discovered the problem this morning. I disconnected the fuel lines from the first three injectors, and connected them to good, spare injectors I had. I had my wife crank the motor while I watched. Number 3 injector was not putting out any fuel at all. I swapped this injector with another good one, with the same result. The problem is the newly rebuilt pump.



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scotc

05-28-2012 11:23:04
72.106.101.208



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 Re: Cummins missing. in reply to Walter Buller, 05-14-2012 14:30:03  
Definitely the pump, they missed something, or didn't go into it as far as they would have you believe. If it was a fuel supply issue it wouldn't be firing good on certain ones and then not on certain others.



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alvan

05-12-2012 17:14:03
74.215.116.189



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 Re: Cummins missing. in reply to Walter Buller, 05-11-2012 21:32:11  
I had a 8.3 cummins that done the same thang and it turned out to be the lift pump the screen going in to the pump was stopped up witch made the pump to pump air put a new lift pump on and cleaned the tank now runs like a top
easy and cheep fix hope this is your problem.



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Lyndon - AB

05-12-2012 08:15:48
72.172.117.164



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 Re: Cummins missing. in reply to Walter Buller, 05-11-2012 21:32:11  
Lift pump broken or partially plugged?

Not very experienced with the dodge's, but had a delimber that had similar symptoms. Turned out to be a mostly plugged inlet line to the lift pump. Let just enough fuel through to run, but no power, stumbling, etc. Had to steam all the dust and crap out of the fuel tank.

Another possibility is air entering the fuel stream. If you put a clear line in between the filters and the injector pump, you can see if there are any air bubbles in the fuel stream.

Hope that gives you a few things to go on.

Lyndon

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puln70

05-12-2012 01:22:49
72.241.3.180



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 Re: Cummins missing. in reply to Walter Buller, 05-11-2012 21:32:11  
I didn't see aything about adjusting valves?



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Walter Buller

05-12-2012 04:51:20
99.195.56.60



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 Re: Cummins missing. in reply to puln70, 05-12-2012 01:22:49  
We did that too.



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