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Old 08-16-2011, 10:16 PM   #1 (permalink)
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Bad Injector?

I have a 2005 dodge cummins and at idle if i rev it up and let off my engine stays revved and feathers its self back down. Also going down the road if i let off of it while moving it feels like its missing the truck has a stutter to it.
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Old 08-16-2011, 10:57 PM   #2 (permalink)
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Could this be a bad injector?
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Old 08-17-2011, 12:40 AM   #3 (permalink)
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Could be need alot more info tho on whats goin on is there any white smoke is ur oil level rising how well does it idle possible video of the rpms when its revved up and idled back down ?
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Old 08-17-2011, 12:43 AM   #4 (permalink)
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How does it run when you start it in the morning?
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Old 08-17-2011, 12:54 AM   #5 (permalink)
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Honestly, I thought mine was messed up too when I noticed that it did the same thing, but I have a feeling it's some sort of programming that keeps it from barking the turbo. Mine does the exact same thing as you described. I have no white smoke except for a very faint puff upon start up, and once in awhile while sitting at a light I see a faint hint of light smoke haze. Never gain oil, however I burn about a 1/2 quart every 5000 miles. Mine also sometimes has a stutter while at idle, like it skips a beat then tries to catch back up. Kinda weird.

My old work also had a 2005 that did the same thing. I checked it out after I noticed mine doing it. Same exact results. So my conclusion is it had to be fuel mapping/programming in the ecu/ecm.

So far, I've had the truck since November 2010, and the mileage has been a consistent 15-16mpg around town, and maybe on a good tank 16-17mpg on the freeway. But average is 16mpg.
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Old 08-17-2011, 12:52 PM   #6 (permalink)
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I have not seen a haze of white smoke at all. It does seem like every now and then while at idle that it skips a beat will get a video on here of it revving up asap
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Old 08-17-2011, 06:59 PM   #7 (permalink)
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I cant figure out how to get the videos on here but here is a link to them.

http://s1188.photobucket.com/albums/...20Dodge%20Ram/
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Old 08-17-2011, 07:06 PM   #8 (permalink)
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Aww man thats hard to call. Id say ur good it does kinda do it in steps by the looks of the gauge but by listening to the engine it sounds like its back to idle faster than the gauge is. This is a normal ghost in the 3rd gens just some electronic thing. My gauge is slow to return to idle but i havent seen the steps like that. I think its just an electronic spook and nothing really is goin on. Do you have ANY other signs of a bad injector IE rising oil level, fuel in oil, white some in exhaust, blow by... any thing

Just saw the secound video you have black smoke and then a haze at wot which isnt a concern and a puff or white possibly idk i think your fine but can always pull ur injectors and get them tested to find out for sure.
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Old 08-17-2011, 07:16 PM   #9 (permalink)
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It has a stutter in the exhaust just like the gauge it is just really hard to tell in the video. When I got the truck i was told an injector was bad i got it hooked up to a computer and they said my number three was bad so i got it replaced ran good for about a week. Then i was idling in a parking lot and it started running really rough and had white smoke coming out. Took my programmer off of it drove it home and it had quit. But now it has the weird revving up problem which was what it was doing before i got my last injector replaced,
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Old 08-17-2011, 07:21 PM   #10 (permalink)
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Ok with that full story im sure its bad injector. It fixed its self when u removed the programmer cause u took the extra strain off the injector. Pull them and get them tested the running rough and white smoke is injector just test them and replace the one with the issue or get a whole new set.
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Old 08-17-2011, 07:25 PM   #11 (permalink)
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Well i put my programmer back on it and it hasnt did it since. I just wish I knew more about working on this cr how hard would it be for me to pull the injector on my own i have never really tore into a cummins i have only worked on gas motors.
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Old 08-17-2011, 07:35 PM   #12 (permalink)
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not that hard to do just be sure u keep the fuel system really clean. You need to remove the lines from the rail or the entire rail with the lines hooked up to it. remove the jam nuts on the injector tubes. then have to remove the exhaust rockers to remove the injectors. Gotta keep all the fuel lines and rail and injectors very clean. Look it up on here im positive some one has done a pictorial of the process or go the thoroughbreddiesel.com they have video of the process.
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