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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.

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Old 07-16-2019, 10:33 PM   #1 (permalink)
jeeperaz
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Poor MPG

'06 with only 60k miles on it.


Obviously I dont drive it often so it's hard to know exactly when this poor mpg started. Currently, around town I am only getting about 12mpg (DIC) if I tender foot it.

This is not normal. I've averaged over 13 with a heavy pedal in the past. I know 1mpg doesn't sound like much but if I drove my truck like I used to, I imagine it would be more like 9-10mpg currently.


So what could cause a sudden 4mpg loss?



Recent work done...
Glow Plug replaced(was either #2 or #4)
Coolant Flush
New Transmission lines and refill with transync
new air filter
fuel filter
cleaned MAF




Things I've noticed...
stronger than normal exhaust smell (but nothing visible from pipe)
possibly more intermittent 'typewriter' ticking from engine... noticeable on both sides.


It's stock other than 285 mud terrains.


Any thoughts on what I can check?

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Last edited by jeeperaz; 07-16-2019 at 10:34 PM. Reason: clean up spacing
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Old 07-16-2019, 10:36 PM   #2 (permalink)
412KING
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Check your brake pads and rotors for signs of dragging. I was down around 12 or 13 and then replaced calipers pads and rotors and immediately went up to about 16, even with a pretty heavy foot. My truck sat for a little over a year so I'm sure the sitting helped it. Could be your case

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Old 07-16-2019, 10:58 PM   #3 (permalink)
jeeperaz
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Quote:
Originally Posted by 412KING View Post
Check your brake pads and rotors for signs of dragging. I was down around 12 or 13 and then replaced calipers pads and rotors and immediately went up to about 16, even with a pretty heavy foot. My truck sat for a little over a year so I'm sure the sitting helped it. Could be your case

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thanks. I'll check them.

Your post reminded me of another thing I noticed... in park, looking at the DIC, I can watch the MPG drop. I dont remember it dropping as fast in the past.
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Last edited by jeeperaz; 07-16-2019 at 10:58 PM.
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Old 07-18-2019, 12:49 AM   #4 (permalink)
dk2429
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You have a one of kind truck either way. 60k miles on a stock LBZ.. beautiful
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Old 07-18-2019, 05:15 AM   #5 (permalink)
Saltfever
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Quote:
Originally Posted by dk2429 View Post
You have a one of kind truck either way. 60k miles on a stock LBZ.. beautiful
Not one-of-a-kind . . . check my signature.
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Old 07-18-2019, 11:18 AM   #6 (permalink)
steakman
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Have a gander at your WIF sensor (bottom White plastic unit on your fuel Filter)- could be cracked..?? Check for a leak there.

Or youve got a leak somewhere.
Tire pressures are also a potential source ...if they are too low.

Theo
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Old 07-18-2019, 12:02 PM   #7 (permalink)
Babin Farms
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Have you hand calculated the mileage? The lie-o-meter might just be going nuts
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Old 07-18-2019, 04:05 PM   #8 (permalink)
Saltfever
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Interesting . . .!
I got an email saying that Rvn4me had replied to this thread but it is completely missing here. However, steakman's reply 4hrs later is posted here. Any ideas . . . ?

BTW: Rvn4me post was a highly technical, excellent explanation of the MAF's function.
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Last edited by Saltfever; 07-18-2019 at 04:08 PM.
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Old 07-18-2019, 07:46 PM   #9 (permalink)
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Quote:
Originally Posted by Saltfever View Post
Interesting . . .!
I got an email saying that Rvn4me had replied to this thread but it is completely missing here. However, steakman's reply 4hrs later is posted here. Any ideas . . . ?

BTW: Rvn4me post was a highly technical, excellent explanation of the MAF's function.
Rv did post but then deleted the posting. He has a habit of posting then deleting lately
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Last edited by OkDually; 07-18-2019 at 07:47 PM. Reason: sp
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Old 07-19-2019, 03:10 PM   #10 (permalink)
jeeperaz
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Quote:
Originally Posted by Saltfever View Post
Interesting . . .!
BTW: Rvn4me post was a highly technical, excellent explanation of the MAF's function.

Well that's a shame. I'd would have been interested in reading the MAF info.

I'll check the WIF sensor and tire pressure.

I havent hand calculated miles yet. It is quite possible this last bit of fuel I went through was from a fill up back in September 2018. Got somewhat close to E and just added 10 gallons last week.

Thanks for all the replies. I appreciate any other ideas or thoughts.

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2006 GMC 2500HD LBZ CC SB SLT 4X4,SRW,
1985 Jeep CJ7
2006 Ragen FB2500 Toy Hauler


Last edited by jeeperaz; 07-19-2019 at 03:11 PM.
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