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Old 06-18-2009, 09:01 PM   #1
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Weak Cummins

I recently acquired a 1997 Dodge 2500 with a cummins turbo diesel. Its a 5-speed manual, with no programmers nor exhaust. The truck has 193,000 miles on it but still runs good. It starts everytime, and doesnt smoke at all. The problem is that is has no ***. I mean, it wont even get out of its own way. I can drive the truck around town, park it and step into my 03 ram 3500 and it feels like ive jumped into a Z06. I cannot hear the turbo at all on the 97' like a i can on my 03'. Is there anyway to test to make sure the turbo is creating boost? Is this just something I am going to have to get used too? My 1991 cummins would run off and leave this 97' like no ones business. I realize these aren't race trucks, but im afraid to pull a big load with it. Any help or suggestions would be appreciated.
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Old 06-18-2009, 09:04 PM   #2
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Look into the inlet of the turbo. If the fins are worn down or bent and gnarly, then it's been run with a dirty air cleaner for a long time. Needs work.
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Old 06-18-2009, 09:05 PM   #3
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Bring it our here Clint and forget about it. I'll deal with the problem.
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Old 06-18-2009, 09:08 PM   #4
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Sounds to me like a great excuse to install a nice boost gauge.
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Old 06-18-2009, 09:09 PM   #5
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lol! Im on my way Daryl!
Dott, I'll check it out tomorrow. Would this just be a simple rebuild of the turbo?
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Old 06-18-2009, 09:31 PM   #6
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Would this just be a simple rebuild of the turbo?
I think so, never done it.
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Old 06-18-2009, 10:28 PM   #7
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Usually they smoke like a motha when the turbo is going out. Fuel filter? Air filter? Lift pump?
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Old 06-19-2009, 05:52 AM   #8
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Usually they smoke like a motha when the turbo is going out.
Why?
I could understand it if the seal is leaking, but worn blades wouldn't cause it to smoke.
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Old 06-19-2009, 06:40 AM   #9
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Im going to check all of that stuff today. Id be willing to bet its got something to do with the turbo......................
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Old 06-19-2009, 07:23 AM   #10
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Im going to check all of that stuff today. Id be willing to bet its got something to do with the turbo......................
The rebuild kits only include the seals and bearings. If you need the wheels, that's another story.
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Old 06-19-2009, 08:32 AM   #11
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Is this a 12v or 24v? Think that the year they change.
Sounds like you mite have a boost tub off or one of the rubber elbows is blown out.
If its a 24v first thing is put on a fuel pressure gauge. There like $150 hard line it into the cab. Its the first mod to do to these truck. Well save you from burning a injector pump up.
If it is a 24v you can run the codes off the dash and it well tell if the injector pump is out.
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Old 06-19-2009, 09:17 AM   #12
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Why?
I could understand it if the seal is leaking, but worn blades wouldn't cause it to smoke.
In my years of driving trucks everything that I have seen that lost a turbo SMOKED......BAD!
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Old 06-19-2009, 10:00 AM   #13
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Old 06-19-2009, 10:14 AM   #14
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Quote:
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Why?
I could understand it if the seal is leaking, but worn blades wouldn't cause it to smoke.
If the impeller is chewed up, it won't pull in air to compress, but the skinny pedal is going to still be pouring the fuel to it. If you aren't getting the air it needs, it would be rich as hell, and smoke. Or if a seal is bad, blue smoke.
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Old 06-19-2009, 11:04 AM   #15
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I looked over all the boots and tubes, to find no cut nor tears. The truck has been running like this for 1-2 years. Now that I own it, i would like to get it fixed. Like I said, no blue or black smoke at all...........................
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Old 06-19-2009, 04:25 PM   #16
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Could just be dirty. How has the truck been driven? If it's just been lugged around town all the time or idled a lot for long times and never really worked hard it probably has carbon built up in the comb. chamber. If the injectors are dirty and not feeding fuel correctly it wont build much boost. More fuel means more exhaust flow, which spins the turbo and increases the boost pressure. If everything else looks ok I would pour some diesel treatment in the tank, hook up to a big load and work it hot and hard to clean it out. Get a good set of gauges (pyro, boost mainly) put in it first so you can see what it's doing.

I can usually tell a difference in my truck after pulling a heavy load if I havent worked it or driven on the highway in a while.
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Old 06-19-2009, 08:09 PM   #17
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The truck has been drivin VERY slowly just around town the last few years(seriously, this thing hasnt seen 70mph in years). This may sound ridiculously stupid, but just from running it hard around my area today it seems to be running better. I pulled a small trackhoe around with it also, and I can hear the turbo spooling a little bit more. I'm about to do a service on it tomorrow, so i'll be changing all the filters also. I'll keep yall posted on the outcome.......................
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Old 06-21-2009, 11:04 AM   #18
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Well, I put all new filters on it. Checked out the turbo, and everything looks fine. I'm going to continue to drive it, to see if anything improves......................................
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Old 06-21-2009, 06:53 PM   #19
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bring it to Mike at hotrod diesels in hitchcock. he'll make t run like a race truck! his is in the low 10's... would be in the 9's but cant get the second stage of nos to hit right and it blows the tires off....
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Old 06-29-2009, 04:24 PM   #20
 
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If the impeller is chewed up, it won't pull in air to compress, but the skinny pedal is going to still be pouring the fuel to it. If you aren't getting the air it needs, it would be rich as hell, and smoke. Or if a seal is bad, blue smoke.
granted if the turbo is chewed up it will not pull the air it needs to run right. But at the same time the skinny pedal will not be pouring fuel to it, there is a control on pump that keeps fuel from coming on until boost is built, unless some ***hat has bypassed it. Won't run rich either, there is no rich or lean in a diesel, more fuel equals more engine rpms. less fuel is less rpms.
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Old 06-29-2009, 04:27 PM   #21
 
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The truck has been drivin VERY slowly just around town the last few years(seriously, this thing hasnt seen 70mph in years). This may sound ridiculously stupid, but just from running it hard around my area today it seems to be running better. I pulled a small trackhoe around with it also, and I can hear the turbo spooling a little bit more. I'm about to do a service on it tomorrow, so i'll be changing all the filters also. I'll keep yall posted on the outcome.......................
I would get timing checked, most of those trucks the timing is very slow on, and they run like crap if it is.
never build boost.
Does it rattle hard when you stomp it? you should here a pretty pronounced ignition knock when you accelrate hard if it is right.
Also check the fitting on the side of pump against engine, spring in it is very common to break, then injector pump will not get housing pressure it needs to work right. a fuel guage can tell you this. or just pinch of return line temporarily (VERY TEMPORARILY!) and see if performance improves.
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Old 06-30-2009, 09:45 PM   #22
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there is no rich or lean in a diesel,
anytime you have air/fuel mixtures you can have rich or lean conditions....all these hotshots "rollin coal" have their fuel delivery rates way to high dumping more fuel than what is need and they are running rich....too rich you have exesive black smoke, too lean and your EGT's go through the roof.

this statement tells me that a Diesel is capable of a Rich condition i.e. unburnt fuel in the exhaust "Diesel smoke is comprised of soot from unburned or partially burned fuel."
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Old 07-01-2009, 08:08 PM   #23
 
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anytime you have air/fuel mixtures you can have rich or lean conditions....all these hotshots "rollin coal" have their fuel delivery rates way to high dumping more fuel than what is need and they are running rich....too rich you have exesive black smoke, too lean and your EGT's go through the roof.

this statement tells me that a Diesel is capable of a Rich condition i.e. unburnt fuel in the exhaust "Diesel smoke is comprised of soot from unburned or partially burned fuel."
just flat wrong. go ask anyone who really knows diesel. there is no rich or lean. There isno throttle plates, no control over volume of air flowing thru engine, only volume of fuel. more fuel, more rpms.
and black smoke is not caused by partially burned fuel. go learn the 'three C's of diesel repair' and you will understand alot more.
I could tell you what black smoke is indicative of, and also white smoke. but if you go learn it yourself you will remember better next time.
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Old 07-01-2009, 08:27 PM   #24
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So what do you call it when the turbo is still pushing air into the engine and the lift and/or injector pump cant keep up with the demand and ends up melting pistons or other components as a result?
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Old 07-01-2009, 08:50 PM   #25
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there is no rich or lean.......no control over volume of air flowing thru engine, only volume of fuel.
I have to disagree. If there is a constant air flow and you vary the amount of fuel being injected, then you have changed the air/fuel ratio. It is usually referred to as richer or leaner.
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