Runs rough at 1200 rpm - Dodge Cummins Diesel Forum
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post #1 of 8 (permalink) Old 10-11-2019, 08:00 PM Thread Starter
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Runs rough at 1200 rpm

I have a 94 dodge 5.9 12 valve. MBRP 4” turbo back, 80 hp Bosch injectors, 0 throttle Plate, 6 deg advance to a18 deg total.
Has great power above 1500 rpm but very rough at 1200 rpm. Starts and idols fine.

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post #2 of 8 (permalink) Old 10-11-2019, 08:04 PM
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The advanced timing makes the turbo less responsive, so it will lag worse than with stock timing. 80 hp injectors has no meaning. You had 160s, at the least, stock.

Next you'll be asking why your exhaust is black?

97 3500, 2 WD, G56, slightly bombed, 1.3 million miles. Started the second million on 8/24/13
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Last edited by GAmes; 10-11-2019 at 08:11 PM.
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post #3 of 8 (permalink) Old Yesterday, 12:10 AM
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Rough spots at a specific RPM are an injection system issue. Where did the injectors come from? DVs? Governor setup?

'95 2500 ECLB 4x4, 334k and paused due to epic transformation in progress.
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post #4 of 8 (permalink) Old Yesterday, 08:42 AM Thread Starter
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Bosch injectors from industrial injection. The governor is stock. New at this what is DV?
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post #5 of 8 (permalink) Old Yesterday, 08:59 AM Thread Starter
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Running rough before I advanced the timing 6 deg or did the 0 throttle plate mod. Neither made a deference on the rough running. Developing up to 40 psi boost when step on it.
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post #6 of 8 (permalink) Old Yesterday, 11:25 AM
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Sounds like one or more of the injector lines are not 100% straight up & down at the injectors. Loosen lines off completely & bend so that they line up straight to the inj's at rest. Then tighten down.
If that doesn't fix it, then you need a larger set of DV's, such as a set of 191's.

98 12v w/G56, 700ccís, My stg5 twins, cam, taper cut DV's, 90hp injís, high volume/pressure lift pump, stg3 head
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post #7 of 8 (permalink) Old Today, 08:21 AM Thread Starter
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First of all thanks for the feed back I do appreciate it. I located a new set of performance .191 DVs on eBay for $99 with snap on socket. Five star rating. Or???
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post #8 of 8 (permalink) Old Today, 12:24 PM
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I would talk to someone that sells various DVs and see what they recommend before buying 191s. Power Driven Diesel is probably a good place to start. 191s arenít bad, but some of the newer designs are better. They could be your problem or, they may not.

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