I had the injector pump replaced about 6 months ago (25,000 miles) and ever since then when the truck has warmed up it will splutter when it's idling. I took it back to the shop twice and they checked it out and said that everything was fine. They couldn't figure it out. I also noticed that the mileage dropped from 15 to 13 after the new pump was put in, I just put the superchip on it so that isn't it. Another guy on DTW has the same problem with his 98.5 after the pump was changed, anyone have any idea what's wrong? Any help would be greatly appreciated.

HD

 

Welcome to the board. I will be watching this post as I have some interest in seeing if anyone has some input or personal experience. Here's my relating story. About a month ago I got a truck in that the customer was complaining of lack of power and an occasional "dead pedal". They had talked with another dealer and they had said to install a lift pump and sold them one. I brought it in the shop and found a p0216 with quite a few starts. Cleared the code, started the engine and brought it up to around 2k rpms. I often find that if I sustain higher rpms, or test drive in 2nd gear for a bit, if a 216 appears that will often hasten it. Didn't take long to see what was wrong as I nearly killed everyone in the shop. I was watching some data while at 2k rpm and didn't realize how bad this thing was smoking. Nice raw blue fuel smoke.....and it set the p0126 pretty fast. I ended up installing the customer provided lift pump, and installed a new VP. Got it running, went on a road test of about three miles. Pulled up to a light and felt a "bump"....hmmmm that was odd. A block later I pulled in the drive and the engine was missing erratically. Not real bad, but noticeable. Off idle and driving it was great, but drop to idle and after a couple seconds you would pick up this "miss". Not a single cylinder miss, but erratic. It would actually seemingly go away at times. I tried canceling cylinders, but that didn't show a thing. Fuel quality appeared ok. I unhooked the VP and hooked up my cummins test tool (eliminates the ecm and wiring). With this test box hooked up the truck idled just fine. Customer needed the truck bad so I explained what was going on and that the truck ran and drove just fine, but showed them this miss. Truck was somewhat cool when they picked it up so it ran ok until warmed up. They used the truck for a week and then returned. Put 1000 miles on it, so fuel obviously wasn't an issue. I called tech line with the data I had and they recommended removing all the injectors and having them pop tested. If they fail, new injectors, if they passed, try another VP. I discussed this info with the SM and advised that the customer stated he never had an idle prob, just the drivability issues (+ the smoke show in the shop). We decided to install our other VP on the truck. I wasn't betting that it wouldn't fix the issue...and it didn't. Got with the customer and discussed the options. He's ordering some RV275's and installing them himself (168K on the truck). I'm hoping to hear from him soon. I'm just leary on the injector theory as the engine would idle just fine with the test tool hooked up. ECM maybe???

 

how bout reflashing the ECM first , there are many revision for those calibration, I also would have hang another ECM in place also, I wouldnt put any money on the injectors being the problem. my money would be in the ECM. pull one out of stock , burn a cal. into it and hang it right in front of the old one and run it. and always check your grounds for the ECM and block grounds.

 

Bummer of that deal was that two days before the guy came back we wholesaled a 99. I could have "borrowed" that ecm. Flash would be an option....no tsb's applied, but sometimes the "revision" seems to be the miracle cure.

 

I know this is a little off topic but how do you reflash a ecm. It seems as though i have the exact same problem as you guys with a erratic idle. When you run a program off the smarty does it not reflash the ecm? or is that the pcm?

I would like to get a ecm reflash as well.........


thanks for info

Jeff

 

I just thought of a dozer I used to run, I ran it out of fuel one time and didn't bleed one of the injectors enough. Is the cummins set up the same way?
Just a hopeful thought.

HD

 

Mine was/is doing this before and after a new VP and injector nozzles. Shop didn't know what it was, nor did they really try to fix it. It seemed less prominent after the new nozzles were put on, but it seems to be getting worse. If it is infact an ECM problem, it would be interesting to see if a Smarty would eliminate it.

 

that's a good question. Anything to do with the engine is the ecm. Transmission and cruise....etc is the Pcm. How does the smarty work? reflash the whole ecm or just the fuel and timing map?



Dan

 

Does anyone out there know if the smarty flashes the whole ecm..........or just part of it?


Thakns in adavnce

Jeff

 

mine does the same. New injectors and Lift pump. still doing the same. i havent a clue what to do next.

 

Just a thought, but maybe when the VP44 is dying there are metallic particles sloughing off and travelling downstream and into or through the injectors. That could be screwing with things. It has been established that metallic particles coming from the HP pump on common-rail engines have been know to contribute to injector failures.

 

mine didn't do this until the valve adjustment/RV275 install. I have been thinking its the injectors, and that some day I'll just replace the nozzles and get them pop tested, but I guess it is possible the problem was always there and the larger injectors just made it more prominent?

 

Smarty reflashes to Marco's stock ECM setting...which includes lattest updates AND the High Idle feature.... so I suspect if reflashes the whole ECM. Seem logical?

RJ

 

This is what happened when my HRVP44 went out,miss at idle.Try holding it at a steady 1500 rpm's while sitting stationery with the truck in nuetral and see if its still there.And run your codes,money says you get 0216.

Where did you get your reman pump?

 

My truck is stock (til I get time to install the gauges that were backordered) and I'm having the very same problem...idles fine when first started or when coming to a stop but after a few seconds I get a "miss"...it is definately getting worse but the truck runs fine at any other RPM?????? Sure hope someone figures this out!!!