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Old 03-18-2010, 07:33 AM   eBay Motors  #1 (permalink)
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2006 LLY DMAX smoking/ knocking

I have a 2006 LLY DMAX, 116K miles, Banks 5" exhaust, Banks air intake. I have no 'chip' and no other programmer or engine mods. I do all my own services on a regular basis- oil/filter, fuel filter, trans fluid/filters, air cleaner and tire rotations. I am a pretty conservative driver and have never seen the need to hammer it just to get to the next red light sooner. So I'm getting on the freeway last night (engine was warmed up, just drove truck 40 miles) and I see white or grey smoke puffing out of the exhaust. I back out of the throttle and it goes away. I ease the throttle back in and it puffs smoke again. I'm in a bad spot to pull over so I just back out if it and kind of coast around a curve. The truck stopped smoking so I drove it another 5 miles to our shop and parked it for a few hours. Driving about 10 miles home I tried to replicate the smoking situation. If I get on the throttle a little and then back out of it the truck surges a little, puffs smoke and now there is a knocking sound from the left (driver) side under the hood. But then it clears up. The engine does idle rougher then before as well. So I drove it to work today (40 miles) and and every once in a while I could hear the knocking sound followed by a puff of smoke. Then it clears up and the truck seems to run fine.

Any one had this problem or have any ideas what it may be? Bad injector? Computer?


Thanks,

Jeff
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Old 03-18-2010, 08:26 AM   eBay Motors  #2 (permalink)
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I would say you have a bad injector
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Old 03-18-2010, 08:53 AM   eBay Motors  #3 (permalink)
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x2 sounds like a faulty injector
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Old 03-18-2010, 08:53 AM   eBay Motors  #4 (permalink)
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Thats a tough one. First thing that comes to my mind is your MAF sensor might be dirty. Get a can of MAF sensor cleaner (not electrical parts cleaner or anything but MAF sensor cleaner) and spray the sensor off really good. Let it dry and see if that fixes your problem. Banks uses an oiled filter and the oil can sometimes get sucked through the filter and onto the MAF sensor which can cause it to read off, and that'll make your truck run a little different.

Other than that I'm not sure what it could be. A lot of people with stock LBZ's say that if you drive them easy most of the time then get into the throttle pretty good that it'll smoke a decent amount, maybe that has a little to do with your case, maybe not. I'd bet MAF sensor being dirty way before an injector though. LBZ's are not known to have injector problems, and if it was a bad injector I'd think it would act up all the time not just erradically. When I say LBZ I mean 06 LLY's like yours as well as LBZ's since they're the same motor.
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04 LB7: It's coming along, slowly
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Old 03-18-2010, 09:12 AM   eBay Motors  #5 (permalink)
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hes smoking white though jesse... and a dirt maf wont make it knock at idle

i know i drove around without one once or twice
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Beech - 05 LLY CC/SB 4x4
12.31@108.57 On stock turbo and fuel system

Thanks to,
Big Dipper, Efilive, Calvert, Precession Converters, Nick@Duramaxtuner, Eaton, Pureflow, and Falken

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Old 03-18-2010, 09:36 AM   eBay Motors  #6 (permalink)
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He said white or grey. If it's grey it can just be a light haze of black smoke, too much fuel from a bad reading MAF. that'd be a simple thing to try anyway. No the maf won't make it knock at idle. But I'd think an injector would act up all the time not just some of the time. It should be repeatable.
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04 LB7: It's coming along, slowly
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Old 03-18-2010, 09:48 AM   eBay Motors  #7 (permalink)
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true...unless its a harness issue but that shouldn't happen on an 06 LLY.... does sound a lot like it thogh
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Beech - 05 LLY CC/SB 4x4
12.31@108.57 On stock turbo and fuel system

Thanks to,
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Old 03-18-2010, 09:53 AM   eBay Motors  #8 (permalink)
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could be the connection on the injector it happened to mine before.if its that tho it should throw a cylinder misfire code.
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Old 03-18-2010, 10:46 AM   eBay Motors  #9 (permalink)
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sounds like what happened to mine. injector harness and injector.
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Old 03-18-2010, 10:47 AM   eBay Motors  #10 (permalink)
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I checked the MAF sensor. It was loose, I could wiggle it back and forth before I loosened the 2 screws. I cleaned and reinstalled it. It didn't look dirty and I didn't see anything obviously wrong with it. It doesn't knock at idle, only under power, and not all the time. It comes and goes. It is/was idling rough, almost feels like a misfire in a gas engine. The smoke was grey or white looking but is hard to tell while driving it at night. It's not the black smoke from unburned fuel. I can't test drive it until I'm off work this evening. Thanks for all the advice on this. Hopefully this is a simple fix. If not I'll be back asking what I shoul dcheck next.
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