2006- 2500 5.9 throttle hang at 2,000 RPM - Dodge Cummins Diesel Forum
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Old 05-25-2010, 08:05 AM   #1 (permalink)
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2006- 2500 5.9 throttle hang at 2,000 RPM

I just bought a 2006 Ram 2500, 70K miles. I am new to Diesels so maybe someone could offer some help. if i put it in neutral and hit the throttle to about 2,000 RPM's the motor will hang and rev for about 10 seconds before returning. Also when I am driving at about 1,400 RPM it seems to sputter a bit. any ideas would be helpful.
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Old 05-25-2010, 08:28 AM   #2 (permalink)
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my guess is you need injectors mine hung at 3500 rpm and wouldnt come down till the key was turned off pooched injectors was the prob.
Do you run a rail pressure box.

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Old 05-25-2010, 08:35 AM   #3 (permalink)
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I am a diesel rookie, i have only had the truck 2 mos. the truck is pretty much stock. I bought it from a dealer, it was a trade in, it has an ARC intake and flow master exhaust. I will update my profile. thanks.
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Old 05-25-2010, 05:49 PM   #4 (permalink)
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i took it to the dealer today (my friend owns the dealership and it under warranty, so i tend to believe the tech. they said nothing came up on the codes and everything checked out? they said it could be some sort of aftermarket programming that they can't detect, or something to do with the aftermarket intake and exhaust. kind of at a loss, i don't think it is right?
I have plenty of power, but it hangs pretty hard at 2,000 rpm.. However they are replacing my steering gearbox and stabilizer for nothing?
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Old 05-25-2010, 08:53 PM   #5 (permalink)
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Most of the common rails i have driven hang like that. They are not very responsive and dont like dry revs cause it takes 5 seconds to come down. I was told by a tech that it is caused by the boost in rail pressure when you rev and the pcm wont slam the injector on time shut with a high pressure like that. Mine does the same and i hate it.
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Old 05-25-2010, 09:22 PM   #6 (permalink)
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your rpm hang is normal on a CR Cummins. takes several seconds for the rail pressure to drop from high rpms especially if in neutral. no load on engine thus ECU is telling the injectors to inject minimum diesel from the rail.

if you do have leaking injector needles, watch the oil level like a hawk. a tip leaker can dump lots of diesel into the oil in little time.
if you notice the oil level rising any at all, send an oil sample in to an oil analysis lab and have them test for diesel in the oil. notify your dealer if the test comes back positive. dealers don't have a decent test for leaking injector needles.
only solution is to pull the injectors and send in for testing.
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Old 05-26-2010, 12:06 AM   #7 (permalink)
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thanks for the help, i will keep digging. maybe i can find someone local that knows more about it, and can test it, other than a dealer. (pretty sad when the dealer tells you they have no idea?).
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Old 05-26-2010, 02:41 AM   #8 (permalink)
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My brother had the exact same problem as you. If you look at my post its pretty much the same thread. We took it into the dealer for a reflash and the problem stopped.
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Old 05-26-2010, 03:23 AM   #9 (permalink)
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good idea, get it reflashed. used unknown truck and programmer history.
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Old 05-26-2010, 08:49 AM   #10 (permalink)
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Do they make chips for these trucks? could the truck have a chip in it? would the dealer know by a diagnostic? Would the ARC intake and Flowmaster exhaust require a reprogramming? if they re flashed it would it mess anything up?
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Old 05-31-2010, 11:26 PM   #11 (permalink)
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Quote:
Originally Posted by steelhead01 View Post
dealers don't have a decent test for leaking injector needles.
only solution is to pull the injectors and send in for testing.
I had an 03 Dually auto 305/555. It had an injector shield leak, and the dealer put some flourescent dye in the crankcase, and it showed the leakage. I discovered the leak when I noticed a strong fuel odor under the hood, coming out of the vent tube. Plus my fuel mileage was really bad, so I pulled the dipstick and voila, it was about 2" above the full line. Thanks.
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Old 06-01-2010, 04:05 AM   #12 (permalink)
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I'm buying a 2005 cummins 5.9, I tried it out and it's running good however it has almost the same problem. You rev it up and it is very slow to go back to idle. It almost does it in steps.
Injectors?
I am an automotive mechanic, but never worked with diesels. Please help
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