HELP ME!

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I am brand spanken new to TDR and love all of it already. The relationships together is a strong tie between all Doge people. I do have a problem with my 92 turbo diesel. I was hoping someone could help. I was out and about traveling empty when I noticed My BABY started to sound like it was missing. Only at low idle and a little bit of throttle it would jump just a little. I have only put a "16 housing" on it and they adjusted the valves for me and that is it! It runs good for no mods to it, untill now. I burn pretty good fuel in it and I changed the fuel filter about 10,000 miles ago. Would it be acting up and making it miss like that only at low idle or would it be the pump timing? I am just guessing, this is my first and I don't know much about them so I was hoping you all could help me. By the way it only has 101,000 miles on it. I am the FIRST to tow anything with it. I hope you can help! Thanks,

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Go Hard or Go home!

 

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Did you prime the fuel filter good when you changed it?

 

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You might try changing the fuel filter and inspecting the fuel feed line from the tank to the transfer pump for damage that would let air in.
The original owner of my truck said at 12000 miles the engine dogged out-it was the filter.

If no improvement the transfer pump would be the next thing suspect.

Neither of these items is terribly expensive-less than $100 for both.



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'93 W350 Club Cab, Bright White, 5 sp. , 130K, Factory Options: LE, 4. 10 Limited Slip, 7600 lb. rear springs, tachometer, front stabilizer bar. Mods: Banks stinger plus, Linex bedliner, 25,000 lb gooseneck ball, 10,000 lb receiver, Tekonsha brake controller, POWER WAGON injectors-WAY faster than stock!.

 

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Most obvious are clogged fuel filter or clogged injector. If the miss and/or loss of power is random, the filter seems most likely - if the miss is consistent, a clogged injector or other problem local to a single cylinder is likely. Changing the fuel filter, and use of a quality injector cleaning additive would be step one, BUT, if there is ANY likelihood of a missadjusted valve, it should be corrected immediately, before valve damage results.

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Early '91 250, 727 AT, 307 rear...
Banks Stinger exhaust, intercooler...

 

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Search around here for a thread I started, "engine won't idle" or some such. Yours does not sound as chronic as mine, but it does sound similar.

As stated before, check for air. Do this through the lift pump and low-pressure bleed screw.

Check for air at the injectors. While running, crack each of them. This also will help determine if an injector is bad - idle speed should change when you crack the injector high-pressure line.

If you can, crack the high pressure lines coming out of the pump. Hard to get to, but worth the time if you have a stubborn air problem.

If you find air, it obviously came from somewhere. Use carb cleaner on the intake line from the tank to the lift pump while the engine is running. There will be a delay, but when you find it, the rpms will increase. Check for rub spots, etc. all the way along the line. There will not be a fuel leak there - the fuel is sucked into the lift pump and used faster than it will leak.

Let water out of your filter, and/or change it. If the lift pump doesn't push much through that low-pressure bleed screw, change it too.

If you still have not found the cause, dump your gas tank and clean it out too.

That ought to keep ya busy. Welcome!
Jon.

 

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I have found that the recommended 10,000 mile fuel filter change is not always right. Its easy to get some bad fuel especialy if you fill up when they are filling the stations tanks. Stirs up junk in the tank. I've noticed with mine when it starts to stumble a little I change the fuel filter and that takes care of it.

Originally posted by 3dracer:
I am brand spanken new to TDR and love all of it already. The relationships together is a strong tie between all Doge people. I do have a problem with my 92 turbo diesel. I was hoping someone could help. I was out and about traveling empty when I noticed My BABY started to sound like it was missing. Only at low idle and a little bit of throttle it would jump just a little. I have only put a "16 housing" on it and they adjusted the valves for me and that is it! It runs good for no mods to it, untill now. I burn pretty good fuel in it and I changed the fuel filter about 10,000 miles ago. Would it be acting up and making it miss like that only at low idle or would it be the pump timing? I am just guessing, this is my first and I don't know much about them so I was hoping you all could help me. By the way it only has 101,000 miles on it. I am the FIRST to tow anything with it. I hope you can help! Thanks,

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1990 250 stock. 3 speed auto/3. 07 rearend. 215,000 +miles.

 

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Did everything on the list and still no solution. We cracked the injectors and they were fine. Changed the filter and still nothing... . It doesn't really have a rough idle, but more of a speed up then back down, speed up and then back down idle. And at this, not all of the time. When I come up to a stop light and have to hit the brakes hard the idle speed will change. Is this familiar? If so that is what it sounds like at the idle and a little above idle. THanks for all your help and I hope the new info I have helps some too... . THANKS.

 

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Just a guess but it sounds to me like a leaking throttle shaft seal (given the age and the poor fuel nowadays) Use your carb cleaner to spray cautiously around the shaft area. If there is a leak engine rpm's will increase. Keep us posted

Chuck

2001 4x4 QC Lwb Stock for now!

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Chuck,
Our CUMMINS don't have throttle shaft seals like a gas engine.
HAPPY RAMMIN
Caleb Reese

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1993 LE W250 4x4 CC,Auto,3. 5's,Limited slip. Diamondplate,K&N,Egt,Boost,trans temp VDO Vision series, BD 3 1/2" Exhaust, 16cm housing,Mag Hytec Diff+ Trans pans,Transgo TFOD shift kit.

 

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My '93 has a new shaft seal and lift pump and I notice the idle speed fluctuation after a hard stop.

A THEORY:

Our first gen trucks use a system of balanced force, composed of springs and flyweights, to meter the fuel.

The flyweights revolve about an axis that is parallel to the line of vehicle travel. Depending on the orientation of the weights to this axis and their physical connection to the metering system any acceleration or deceleration causes a corresponding temporary APPARENT increase or decrease in weight mass.

A rapid deceleration beginning or ending is equivalent to suddenly placing a slightly lighter/heavier flyweight set in the mechanism. This, in turn, temporarily disturbs the designed rpm/fuel rate and manifests itself as a idle speed fluctuation.

While coasting in neutral I can jab the brakes and watch the idle speed drop then increase. I can repeat this as often as I wish.

 

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Mine does that just idling though. Not rolling anywhere, but that is what it sounds like. I still can't figure it out. It still doesn't do it all of the time either?! UGH! It is kind of annoying too. Thanks for your help and keep trying please.

 

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You did not post the number of miles on your truck, but after a certain age, the pumps do often get slightly unstable at low idle. If it's bad enough to stall, try slightly jacking up the idle. Giving it another 50 rpm will often get away from any surges or hunting.

As mark93 hinted, the governor DOES operate by weights against springs, and accelerations in either direction, or even strong tilts, can affect the operation just a bit, especially at low speed. Often the spots where the engine runs the most get slightly worn, resulting in slightly unstable operation at that speed. This normally isn't idle.

Also, any air in the fuel can do as you describe, as well as electrical problems that might allow the cold advance to kick in and out. Air can come from any leaky joint in the fuel line, any bad hose, from the supply pump on the block side, or from the filter - anything on the vacuum side of the pressure pump (or the whole system, if that pump fails).

Also, there are small "delivery" valves for each injection line (located where the line fittings screw into the injection pump itself. These can operate erratically when old, or a spring breaks or if they get dirt or metal chips in them.

One last, nasty thought... Your pump can be failing. Anything from broken springs to a failing cam plate to a worn plunger or internal linkages.