DIESEL owners, please post (good & bad) weekly updates here - Page 44 - Chevy Colorado & GMC Canyon
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post #861 of 873 (permalink) Old 04-18-2017, 06:59 PM
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Just got the truck back , had a P0299 turbo under boost. First try was a new turbo, failed again after 20 miles. Second attempt, NOX sensor and ECM update, made it 70mi before next fail. Final fix was to pressure test the intake system with smoke and find the cracked pipe. When I took it in I told the SA that I had seen the cracked pipe on the forum so when I picked it up, he said you were right, pipe fixed it.
I have now had the truck 1 year and at 22k miles. Love the truck, so far I have averaged about 27.5 MPG. The DIC. Shows best mileage for 25 miles is 54. I'm sure that is a trip down from the VA house, 6000' to 250' here, the first 20 miles are all throttle off exhaust brake on.
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post #862 of 873 (permalink) Old 04-19-2017, 11:39 AM
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Ran my first bed load in the truck yesterday. About 530 lbs in the bed, wife, kids, full tank of gas.... 15 mins of idling and my mileage was 27.7 mpg in tow haul mode over ~40 miles round trip. The truck felt better loaded down with what I consider a descent load.

Only mod is the ProFab intake... but that was phenomenal mileage.

2016 Z71 Midnight Edition Colorado w/ Duramax and Bose/Nav.
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post #863 of 873 (permalink) Old 04-19-2017, 12:17 PM
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11 weeks 2300 miles.....all around town....only put in $210.00 in it so far and still have half a tank with over 300 miles on this tank...have zero problems....no noises or rattles.....the diesel is a super engine

pictures on my profile of my truck during
assembly on 01-09-2017 Wentzville Mo.
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post #864 of 873 (permalink) Old 04-19-2017, 03:01 PM
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Originally Posted by Wweilbacher View Post
Good: Over 6ooo miles and no problems or complaints.
Installed the Duramax DSP 4 tune and it is more responsive, shifts noticeably smoother and the MPG's have picked up.

Bad: I wish I had a longer drive so I would have more time to spend in the truck, as it is a pleasure to drive.
If you are using a tuner, don't rely on the DIC to give you accurate mileage results. I know on the full size Dmax, tuners can give false readings of more than 2 mpg's. When I had a tuner on my 06, it told me I was getting 22mpg and had a fuel range of 800 miles. Yeah, right.
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post #865 of 873 (permalink) Old 04-19-2017, 03:38 PM
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If you are using a tuner, don't rely on the DIC to give you accurate mileage results. I know on the full size Dmax, tuners can give false readings of more than 2 mpg's. When I had a tuner on my 06, it told me I was getting 22mpg and had a fuel range of 800 miles. Yeah, right.
With my Duramaxtuner I am seeing about 1.5mpg better on the DIC than hand calculated

2016 Colorado LT Diesel
Red Rock, Sports bar, Black 5" assist steps, EGT and Boost Gauge with custom bezel mount (on order)
AFE Magnum Intake and Bladerunner Hot/Cold side Kit
Duramaxtune DSP-4 Tuning (full delete on order)
AFE Rebel side exit turbo back w/ Black tips (on order)


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post #866 of 873 (permalink) Old 04-19-2017, 09:08 PM
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Originally Posted by Tom S. View Post
If you are using a tuner, don't rely on the DIC to give you accurate mileage results. I know on the full size Dmax, tuners can give false readings of more than 2 mpg's. When I had a tuner on my 06, it told me I was getting 22mpg and had a fuel range of 800 miles. Yeah, right.
Thanks for the heads up. This tank won't show much if any improvement since I have done several WOT runs and been generally playing with the new responsiveness.
I'll monitor it over the next couple tanks and see for sure and then report back.

2016 Colorado CCSB, Duramax Z71 4x4, bose, nav, leveling kit, retrax bed cover, linex, Westin Sportsman Grill Guard Winch, Westin T-Max 9500lb winch, Mictuning curved light bar, Undercover swing case's.
Duramax Turner DSP 4

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post #867 of 873 (permalink) Old 04-19-2017, 11:43 PM
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If you are using a tuner, don't rely on the DIC to give you accurate mileage results. I know on the full size Dmax, tuners can give false readings of more than 2 mpg's. When I had a tuner on my 06, it told me I was getting 22mpg and had a fuel range of 800 miles. Yeah, right.
Haha, that's definitely true. I flashed the EcoBoost once and had a range of somewhere near 800, that tank got like 540 miles---that's with a 36 gallon tank 😐. That thing was finicky with mileage, too.

2016 Z71 Midnight Edition Colorado w/ Duramax and Bose/Nav.
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post #868 of 873 (permalink) Old 04-20-2017, 09:51 PM
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Originally Posted by stw146 View Post
Just got the truck back , had a P0299 turbo under boost. First try was a new turbo, failed again after 20 miles. Second attempt, NOX sensor and ECM update, made it 70mi before next fail. Final fix was to pressure test the intake system with smoke and find the cracked pipe. When I took it in I told the SA that I had seen the cracked pipe on the forum so when I picked it up, he said you were right, pipe fixed it.
I have now had the truck 1 year and at 22k miles. Love the truck, so far I have averaged about 27.5 MPG. The DIC. Shows best mileage for 25 miles is 54. I'm sure that is a trip down from the VA house, 6000' to 250' here, the first 20 miles are all throttle off exhaust brake on.
just got mine back and it was same issue. Cracked pipe on the intake.
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post #869 of 873 (permalink) Old 04-21-2017, 10:50 AM
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Got it Oct 2016 with the Chevy shake. 7 weeks total at the dealer and they found an out of round tire causing the shake.

2500 miles and now have EGT sensor issue. Also needed to change the oil as truck had been sitting on the showroom floor for almost 6 months.
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post #870 of 873 (permalink) Old 04-22-2017, 05:36 PM
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anyone experiencing at red light take off if you punch it a vibration or rattle before the turbo spools up? and only then does it happen, im wondering if the turbo has an issue or its that electrical box guys on here are saying it needs to be remounted with rubber behind it. But it isnt at idle. Just when i mash on the throttle from take off, just till the truck gets moving then its gone. Its like the turbo is having trouble spooling up with the load before it gets rolling. But im not ruling out other things touching, this is just what it feels like. Any info would be greatly appreciated.
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post #871 of 873 (permalink) Old 04-22-2017, 08:33 PM
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anyone experiencing at red light take off if you punch it a vibration or rattle before the turbo spools up? and only then does it happen, im wondering if the turbo has an issue or its that electrical box guys on here are saying it needs to be remounted with rubber behind it. But it isnt at idle. Just when i mash on the throttle from take off, just till the truck gets moving then its gone. Its like the turbo is having trouble spooling up with the load before it gets rolling. But im not ruling out other things touching, this is just what it feels like. Any info would be greatly appreciated.
I never mash the throttle from a stop on a diesel truck, the trick is to roll on the throttle to minimize torque management, also mistaken for turbo lag.

Really hard to tell any noise without a sound clip of some sort.

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post #872 of 873 (permalink) Old 04-22-2017, 09:48 PM
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I get that, I've owned every diesel made, I do roll it, but in certain circumstances you have to get out the way of fast moving on coming traffic and it's a vibration not a rattle if I said that I apologize. I really have to baby it to keep the feeling from coming in. I'm going to investigate it more tomorrow. Thanks
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post #873 of 873 (permalink) Old 04-22-2017, 09:52 PM
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In a bind in the snow trying to get out , it sucks too it's all or nothing and I didn't like that, I tried 2 pedaling it and spooling up the turbo, but it's not great in this little 4 banger.lol
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