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Old 07-05-2018, 11:24 PM   #1
Jeremy001995
 
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Question cummins 12v sputtering around 2500rpm

hi, we just put a new engine in the truck..engine was removed from a truck 2 year ago and put in a garage.

its a 1997 215hp 12v..truck run great..idle smooth easy to start..run great until 2500-2800rpm, it start sputtering (white,black and gray smoke.. smell like fuel and eyes burning )

i have stretched the spring in the OFV, got around 40psi of fuel at any rpm..it never go past 45 and never go down 35..

just re-do the timing set a 16* ,Timing is O.K. was doing it b4 at stock timing too.

FSS as been deleted and it is now a manual shut off, in good working operation.

engine is stock.

new fuel line from tank.

New Fuel Filter, Fuel Heater Bypassed.

what can cause this if the fuel pressure is good..? injectors?

tanks alot!!
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Ram 2500 1994 12v South bend DD Comp clutch,NV4500 Manual Trans /NP271 , 62/74/.80 Silver Bullet PhatShaft,3piece manifold, 5x.014 injector, 191 Dv's,Rack Plug,215 p7100 23* Timing with PDD adjustable timing gear,4K GSK ,AFC Live 220GPH Fass
 
Old 07-06-2018, 01:26 AM   #2
Simplysmn

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Could be a dirty or Stuck injector .It doesn't start doing this until 2500 Try running some 2 stroke oil through the tank see if it help's some .
 
Old 07-06-2018, 06:59 AM   #3
jasonc

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How does it run other than that, could clean idle?
 
Old 07-06-2018, 11:27 AM   #4
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Quote:
Originally Posted by jasonc View Post
How does it run other than that, could clean idle?
run smooth in idle and any rpm below 2500-2800!
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Ram 2500 1994 12v South bend DD Comp clutch,NV4500 Manual Trans /NP271 , 62/74/.80 Silver Bullet PhatShaft,3piece manifold, 5x.014 injector, 191 Dv's,Rack Plug,215 p7100 23* Timing with PDD adjustable timing gear,4K GSK ,AFC Live 220GPH Fass
 
Old 07-06-2018, 12:06 PM   #5
jasonc

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I'd check timing again, strong symptom of retarded timing.
 
Old 07-06-2018, 12:54 PM   #6
Yotadzl

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Is it worse cold than hot? Mostly clear up hot? I agree with jasonc, sounds like timing. Internal pump wear can also cause this. If the plungers are badly worn it effectively retards the timing because port closure doesn't happen when it should. Delivery valve wear or broken delivery valve springs can also cause similar symptoms.
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Old 07-06-2018, 01:53 PM   #7
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3rd on rechecking the timing!
 
Old 07-06-2018, 05:14 PM   #8
Jeremy001995
 
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Timing is good!! it only do it only when not fully warm up and cold. when at operating temp it rev fine!! got around 40psi os fuel but i think the lift pump is almost dead.. it started to made thiking sound.. lol
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Old 07-09-2018, 01:53 PM   #9
Yotadzl

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Quote:
Originally Posted by Jeremy001995 View Post
Timing is good!! it only do it only when not fully warm up and cold. when at operating temp it rev fine!! got around 40psi os fuel but i think the lift pump is almost dead.. it started to made thiking sound.. lol
If it does it cold worse than hot, then its timing or heat (compression) related. Like I stated above, it can be pump wear. Just because it measures correctly does not mean it is injecting fuel on time. Usually if its a heat or compression issue it will clear up within a few minutes of running when the cylinder temp comes up.
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Old 07-09-2018, 02:10 PM   #10
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Corey - BSME
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Old 07-09-2018, 03:04 PM   #11
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Chances are it has stuck or broken rings, or a scored bore.
Pull the oil cap and see if it has blowby, while either cranking or running.
Listen for a cranking variance while cranking it over.

Mark.
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Old 07-09-2018, 07:26 PM   #12
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Quote:
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This make big laugh... Haha!
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Old 07-10-2018, 10:19 AM   #13
Jeremy001995
 
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after running the truck one weekend it run fine now.. engine was sitting for 2 year.. maybe the ring was stick in the piston or something like that!
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Ram 2500 1994 12v South bend DD Comp clutch,NV4500 Manual Trans /NP271 , 62/74/.80 Silver Bullet PhatShaft,3piece manifold, 5x.014 injector, 191 Dv's,Rack Plug,215 p7100 23* Timing with PDD adjustable timing gear,4K GSK ,AFC Live 220GPH Fass
 
Old 07-10-2018, 11:28 AM   #14
Mark Nixon
 
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Glad that it appears to have been resolved.

Mark.
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