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Old 03-29-2011, 12:42 PM   #1 (permalink)
tomld
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Problems with my 07.5 duramax - Temp, Shifting, 4WD

I just bought a new to me 07.5 duramax. Drove it 700 miles home from the dealer with no issues. Next week I had a road trip pulling a 5k lbs trailer and had some issues.

First it was running WAY hot. EGT's would climb to 1400+ if I let it (which I didn't). I literally had to limp it up any sort of grade to keep it under 1250.

Next was the shifting, if I was babying it, it would shift fine. But if I got on it to any degree (like to pass or maintain speed on a grade) if should shutter back and forth pretty hard when dropping down a gear.

Next when in 4WD, it would make a grinding noise just when I would get on or off the throttle. It wouldn't do it if I was maintaining a constant speed, only when on or off. And it wouldn't make the noise when in 2WD.

Now about the truck. The dealer said it had a Edge chip with CTS monitor. After calling Edge on the road, it only has the monitor, no edge chip. Are there other programmers that the previous owner could have loaded onto the truck that aren't adjustable and he's using the edge just as a monitor? It sure feels like it has some sort of tune to it.

He also pulled the stock exhaust off it and has a different exhaust tip. Shouldn't it be throwing some sort of regen code with the stock exhaust removed? I'm not familar with how that all works.

Truck has 45k miles on it
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Old 03-29-2011, 01:29 PM   #2 (permalink)
D/AChris
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If the stock exhaust is removed and it's not throwing any codes, it has a tune on it, plain and simple. No way of telling what level or what type of tune it has. It would be nice of your dealer to reset the ECM back to stock for you and then start from there with a new tuner, of your choice, to block any CEL's from coming up. If the dealer did not tell you it had a tuner on it before selling it to you, I'd be pretty upset with them. Cuz I'd never buy a used vehicle that has a tune on it or in the past, which the dealer can check for. Chris
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Old 03-29-2011, 04:29 PM   #3 (permalink)
timoloco
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The EGT are kinda high, but possible under load and a regen. Did they just replace the tip with an aftermarket vented tip, or did the entire exhaust get replaced? Did you happen to notice if the red R light came on on the CTS during your high exhaust temp? Possibly the truck still has the dpf and regen cycle on and you were just regenning. again that's if the emmission system is still in place.
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Old 03-29-2011, 06:07 PM   #4 (permalink)
tomld
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Quote:
Originally Posted by timoloco View Post
The EGT are kinda high, but possible under load and a regen. Did they just replace the tip with an aftermarket vented tip, or did the entire exhaust get replaced? Did you happen to notice if the red R light came on on the CTS during your high exhaust temp? Possibly the truck still has the dpf and regen cycle on and you were just regenning. again that's if the emmission system is still in place.
I just talked to the previous owner. It has an EFI live tune on the "power" setting. He said he experienced most of these issues.

For the temp, he said he could see 1300+ when towing, but by dropping it a gear in manual mode, it would drop the temp and be fine.

As for the "shutter" when towing and getting on it, he thought it was due to the angle of the axle. It has an 8" lift on 37's and he changed it to a 6" lift on 35's which is still has now. Does this sound right? I have an 02 Dmax with a 6" lift and it never experienced these issues.

As for the 4WD grinding noise, he said it might be because it has a stock air intake and that's the sound it makes when its sucking air. He admitted he knew little about trucks and would just pay a shop to set it up for him. So I don't follow his reasoning for this issue. Because it definitely doesn't sound good.

He did say it has a turbo back exhaust which I didn't realize.
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Old 03-29-2011, 06:10 PM   #5 (permalink)
tomld
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The more I think of it, the more the 'shutter' sounds like a u-joint going out. I was in a another truck that has a similar, but much worse sound when you get on it and not 30 miles later the ujoint went out.

It also doesn't have an intake. With a tune and exhaust, it needs one. What is recommended for the 07.5 Dmax's?
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Old 03-29-2011, 06:23 PM   #6 (permalink)
Tanc Crusher
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If you are in the upper gears and you get on it and the truck shutters bad I feel here the torque converter is damaged there.

Edge makes CTS and CS programmers and a CTS and CS Insight as their new line of products. The Insight is digital gauges and info off the OBDII port. The Programmers do this as well. Just the programmers offer the addition of tuning.

Now there can be another program on it. I suggest going back to the dealer and having them flash a stock tune back to the truck. Of course the other thing if the ECM has been tuned then there is most likely no warranty left on the drivetrain for the fixing of the shutter Allison transmission issue if that is the cause. You probably read the ECM in the LMM record the last 10 different calibration tune values. So if GM sees a non stock in history then warranty can be voided.

Just seems with those high EGTs I say maybe there is a tune in it.

Now if the DPF exhaust system is removed it is defiantly been reprogrammed and still is at this time so as not to throw codes. Need to crawl under and look for these items. Off the downpipe from the turbo is first the DOC then the DPF with 2 EGT wired sensors before and aft of the DPF and 2 steel lines off the DPF as well then muffler and finally a special tip to cool the exhaust. If none of this exist it is not stock and is reprogrammed. So with this i feel the previous has over powered the Allison and done some damage to the drivetrain as for the shutter from the Allison and 4wd issue which I really have no good answer on.

The foolow is something to look for. May not exist but an thing to look for.
Now again if no DPF means tuned and probably tuned on the hot side which will explain the high EGTs on towing up grades. You might look around under the panel of the steering wheel for a know that rotates to 5 positions. This will tell you there is an EFILive DSP5 tune which may turn down the power and offer a tow tune with better EGTs. Also in the engine compartment near the front on driver side is the ECM. The TCM is on the fan shroud. See if you see like a couple extra wires coming out of the ECM. Some are purple color wires.

If they sold it with warranty I suggest getting back to them and getting it all corrected and completely noted but again GM may never warranty it but the you have to get the dealer to cover you.

Good luck and let us know what all you find and what happens.

Brian
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Old 03-29-2011, 06:29 PM   #7 (permalink)
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Ok the EFILive has been determined. Dropping a gear will reduce EGTs. But really rather see a tune for towing.

Turbo back exhaust means no DPF so warranty most likely voided even you put it back to stock.

Did you buy from a dealer or from this individual?

Ask the guy what EFILive tune is on it. Like from who, the type of tune, if he has a copy of the tune get it. Same for a stock tune. that is if he programmed it. Ask if it is a single EFILive tune or a EFILive DSP5 tune.

Next ask what all other mods he has done to the truck so you are aware of it like if there is a lift pump or addition fuel filters.

As for lift hard to say but can be a cause on the vibration but to me if you get on it and the whole trucks shake i start leaning towards a damaged torque converter.

Brian
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2007.5 GMT-900 Chevrolet Silverado 2500HD CC/LB LTZ 4x4 Summit White. 4-18-2007. Powered by the LMM Duramax 365hp/660tq coupled to the MW7 Allison 1000 6-speed through the NP1 NP263XHD Transfercase.
Upgrades: Performance Truck Products for 5" MBRP Turboback 6020AL. Alligator Performance for EGR Blocker. DuramaxTuner for EFI-Live with DSP5 ECM Tune and TCM tune. Meyer Performance for Airdog 150 Gen 1 Lift Pump, Diamond Down Pipe. Merchant Automotive for Suncoast IV with 1056 converter, Amsoil Synthetic Fluid in everything, Pitman Arm Fix.
Configure your FlashScan V2 the way it should be http://www.dieselplace.com/forum/sho...d.php?t=401770
Future: SDP S475 Twin Setup is here-install 6-18-11. On board Air with Side Step Tube Air Tanks, Custom Bed Fuel Tank and Water/Meth Tank.
New Toy: 2012 Dodge Challenger SRT8 Red and all stock for now.

Check out: My Garage for pics of the Truck, Mods, and Toys.
UA Steamfitter, Local 136 Evansville, IN
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Old 03-29-2011, 06:33 PM   #8 (permalink)
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What do you mean no intake?

It has to have an intake whether stock air box or an aftermarket cold air intake. Again ask the guy about that. If the stock is present no big deal. The stock air box is good for even 500HP but the Allison does not last long on high HP tuning unless real careful. Things like stay out of WOT wide open throttle of the upper gears 4th on up as well as up and down shifts of those gears.

Also ask the guy if a trans-go jr was added.

Sorry for going on and on. Just like for you to know exactly what you have there. Once you get all this info gathered add the info to your Signature under your profile so one knows what all you have for future help.

Brian
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2007.5 GMT-900 Chevrolet Silverado 2500HD CC/LB LTZ 4x4 Summit White. 4-18-2007. Powered by the LMM Duramax 365hp/660tq coupled to the MW7 Allison 1000 6-speed through the NP1 NP263XHD Transfercase.
Upgrades: Performance Truck Products for 5" MBRP Turboback 6020AL. Alligator Performance for EGR Blocker. DuramaxTuner for EFI-Live with DSP5 ECM Tune and TCM tune. Meyer Performance for Airdog 150 Gen 1 Lift Pump, Diamond Down Pipe. Merchant Automotive for Suncoast IV with 1056 converter, Amsoil Synthetic Fluid in everything, Pitman Arm Fix.
Configure your FlashScan V2 the way it should be http://www.dieselplace.com/forum/sho...d.php?t=401770
Future: SDP S475 Twin Setup is here-install 6-18-11. On board Air with Side Step Tube Air Tanks, Custom Bed Fuel Tank and Water/Meth Tank.
New Toy: 2012 Dodge Challenger SRT8 Red and all stock for now.

Check out: My Garage for pics of the Truck, Mods, and Toys.
UA Steamfitter, Local 136 Evansville, IN
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Old 03-31-2011, 04:22 PM   #9 (permalink)
tomld
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Thanks for the info. Can I buy the edge chip to go along with the CTS monitor and do away with the EFI live all together? I like the idea of the multiple programs. I have a bullydog on my 02 and like the stock to extreme adjustability. What is needed to go from EFIlive to edge? Just a reflash?

For the intake, I mean it just has the stocker.

I'll see if I can get more info and a copy of the efilive tune. Problem is the previous owner (I bought it from a dealer...he traded it in) doesn't know much and they are 800 miles away.

I too think there's a torque converter issue going on. Is there anyway to diagnose, short of having a dealer tear into it?
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Old 03-31-2011, 04:46 PM   #10 (permalink)
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Possible to look at the TCM data with a scanner to see if torque converter is slipping. The CTS may even have that as a PID to see. Not sure. never looked for that on mine. The Insight CTS is just a monitor. To program you need to buy the programmer version or maybe an Edge Evo unit. Edge Evo Race if you plan to leave the DPF off. But before programming it would be best to have a stock tune flashed back. It cost you at the dealer more than likely and with the DPF gone will instantly trip codes when they restart the truck. So no idea if they will log that data to your account and be a mark to void if issues arise. If the torque converter is damaged I doubt GM will fix it for free since it has been programmed with non stock GM tunes. So plan on a full rebuild to a built Allison like Suncoast, ATS, or PPE setup. You more ahead and probably cheaper if you tried to have dealer replace and rebuild and still have a stock Allison.

Brian
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2007.5 GMT-900 Chevrolet Silverado 2500HD CC/LB LTZ 4x4 Summit White. 4-18-2007. Powered by the LMM Duramax 365hp/660tq coupled to the MW7 Allison 1000 6-speed through the NP1 NP263XHD Transfercase.
Upgrades: Performance Truck Products for 5" MBRP Turboback 6020AL. Alligator Performance for EGR Blocker. DuramaxTuner for EFI-Live with DSP5 ECM Tune and TCM tune. Meyer Performance for Airdog 150 Gen 1 Lift Pump, Diamond Down Pipe. Merchant Automotive for Suncoast IV with 1056 converter, Amsoil Synthetic Fluid in everything, Pitman Arm Fix.
Configure your FlashScan V2 the way it should be http://www.dieselplace.com/forum/sho...d.php?t=401770
Future: SDP S475 Twin Setup is here-install 6-18-11. On board Air with Side Step Tube Air Tanks, Custom Bed Fuel Tank and Water/Meth Tank.
New Toy: 2012 Dodge Challenger SRT8 Red and all stock for now.

Check out: My Garage for pics of the Truck, Mods, and Toys.
UA Steamfitter, Local 136 Evansville, IN
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