LBZ timing / injector rattle on spool up - Chevy and GMC Duramax Diesel Forum
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Old 12-03-2012, 09:34 PM   eBay Motors  #1 (permalink)
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LBZ timing / injector rattle on spool up

I have a 2006 LBZ and it is tuned with efi live by idaho rob, when I get on it there is a loud timing/injector rattle while it is spooling, it does it on all of the tunes but is more noticeable on the hotter tunes. Does this mean my injectors are going bad? Truck has 200k miles. Thanks.
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Old 12-03-2012, 09:36 PM   eBay Motors  #2 (permalink)
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What are the mods of the truck? Has the truck always done it or just started to?


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Old 12-03-2012, 09:44 PM   eBay Motors  #3 (permalink)
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fuel rattle maybe? doubt its timimg rattle with robs tunes.
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Old 12-03-2012, 09:44 PM   eBay Motors  #4 (permalink)
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What are the mods of the truck? Has the truck always done it or just started to?


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intake, 5" exhaust, uppipes, downpipe, air dog 2, rail plug, ported rail fitting, built trans, egr delete, 4094vvt, efi live by rob. Truck has always done it with these tunes but i havent ever ran any other tunes since the turbo.
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Old 12-03-2012, 09:50 PM   eBay Motors  #5 (permalink)
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also truck doesnt make any more power on tune 5 vs 4. 4 makes the same power with less smoke and lower egts. But I am at high elevation, and dont get me wrong the truck runs like a raped ape, but 5 just smokes like a coal train. Just trying to figure out if my injectors are bad?
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Old 12-03-2012, 10:15 PM   eBay Motors  #6 (permalink)
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Old 12-03-2012, 11:32 PM   eBay Motors  #7 (permalink)
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It's not timing rattle it is probably a fuel rattle. It is very hard to get timing rattle in a diesel. I had the same problem with a set of my tunes and I never did figure out what was causing it.
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Old 12-04-2012, 07:32 AM   eBay Motors  #8 (permalink)
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Call me tomorrow and we can log the truck. Have you tried contacting us before or was this the first time by making the thread?


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Old 12-04-2012, 11:47 AM   eBay Motors  #9 (permalink)
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Quote:
Originally Posted by chevy71pickupman View Post
It's not timing rattle it is probably a fuel rattle. It is very hard to get timing rattle in a diesel. I had the same problem with a set of my tunes and I never did figure out what was causing it.


Timing rattle IS caused by the fuel in a diesel.

Too advanced initial timing can cause this or the effect from ramping the pressure in too fast causing a increase in the dynamic timing of the motor.

We could also get into transiant timing as well.....again, a timing setting problem based on transient load.

Timing Rattle can also be worsened from poor quality, low cetane fuel that doesn't burn as smoothly. This resulting in pressure spikes in the cylinder..more of a explosion than a controlled burn.

Anyhow, I really doubt it's advanced timing in Rob's tune, he's VERY VERY consevative on timing...but there could be a error.
Usually other issues like EGT problems show up from that, especially on bigger tunes.

Go back to Rob and give him the chance work it out for you..


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Call me tomorrow and we can log the truck. Have you tried contacting us before or was this the first time by making the thread?


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OP, It's always good to try contacting the tuner first...Dustin will get you squared away, hopefully at no cost.







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Old 12-04-2012, 11:54 AM   eBay Motors  #10 (permalink)
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too much timing down low
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