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Duramax First Generation: 2001-2004 (LB7) Discuss the first generation (2001-2004 LB7) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 11-03-2015, 10:47 AM   #1 (permalink)
Frysak
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Straight pipe causing white smoke?

I'm sure my injectors are bad because the truck is smoking like a train so I finally got enough money saved up and took it to the local mechanic shop. They said since it's straight piped it could be causing the truck to smoke more. Could that be true? They are gonna run some test on the truck today.

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Old 11-03-2015, 12:02 PM   #2 (permalink)
Gunrok 02 LB7
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Sounds like hogwash to me. Where they able to justify their statement, or did they just say it to confuse you into more testing and then just move on with something else? That doesn't really sound like a shop that I'd let replace my injectors. In fact, other than to confuse you into more testing, I don't have the slightest idea as to why that statement would even need to be said.

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Old 11-03-2015, 12:23 PM   #3 (permalink)
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Quote:
Originally Posted by Gunrok 02 LB7 View Post
Sounds like hogwash to me. Where they able to justify their statement, or did they just say it to confuse you into more testing and then just move on with something else? That doesn't really sound like a shop that I'd let replace my injectors. In fact, other than to confuse you into more testing, I don't have the slightest idea as to why that statement would even need to be said.
What he said
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Old 11-03-2015, 12:59 PM   #4 (permalink)
Frysak
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They called and said two injectors are bad and two more are getting there. I figured it didn't have anything to do with the exhaust
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Old 11-03-2015, 01:00 PM   #5 (permalink)
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^^^same

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Old 11-03-2015, 02:54 PM   #6 (permalink)
Frysak
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I forgot to mention they said it could be lack of back pressure causing the smoke. I just brought it up there since I don't know how or have any way of checking balance rates. Im gonna have my buddy change them out since he's done it before
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Old 11-03-2015, 04:26 PM   #7 (permalink)
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You might want to find a new shop to look at your truck. Sounds like injectors issues your having. Make sure you stick with OEM Bosch units when buying!
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Old 11-03-2015, 08:55 PM   #8 (permalink)
Frysak
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Here are the rates the shop gave me:
#1 -1.2
#2 2.4
#3 -5.3
#4 2.3
#5 2.4
#6 -2.6
#7 2.9
#8 -1.1
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Old 11-03-2015, 09:04 PM   #9 (permalink)
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Looks like there is only one injector (cylinder #3) that is out of spec. A few higher than normal but within spec.
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Old 11-03-2015, 09:18 PM   #10 (permalink)
Frysak
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I'm gonna go ahead and do all 8. I hear that Bosch redid them back in 07 or 08. How much better are they?

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