Information on the LS4, DOD, and the 4T65E-HD
Staging Lane
Joined: Apr 2009
Posts: 96
Likes: 0
From: Columbus, Ohio
In my opinion the AFM was a good idea. Terrible idea if you got some miles on the engine. My GXP has 146,000 miles and after an extended amount of time in V4 mode it puffs out a lot of smoke, then clears up after about 3 seconds. I obviously have leaking oil in the shut off cylinders..
But it still runs great and has plenty of power.
But it still runs great and has plenty of power.
Well I turned off the DOD mode and the wife says the car gets better mpg now lol IDK why but put on a magnaflow system and after it's first new oil change no oil was used at all and car has little over a 100k on it now before it would use a quart of oil in about 2300 miles I had a catch can on it before and the thing was alway full now it went a full 3000 miles and just a dribble in it. So I'm happy got it working. There was a ticking sound it was making earlier on not sure it's the lifters or rockers and pushrods any ideas on what would make that sound, it cleared up with some additive i put in on my oil change but wondering what part is wearing out?
if anyone is interested in the stock muffler after the cat I have that but to big to ship and I also have the bullet looking muffler that goes right after the cat from the magnaflow system left i didn't use it at all i just made my own flange and straight pipe. Give the car a little more throaty sound.
if anyone is interested in the stock muffler after the cat I have that but to big to ship and I also have the bullet looking muffler that goes right after the cat from the magnaflow system left i didn't use it at all i just made my own flange and straight pipe. Give the car a little more throaty sound.
TECH Apprentice
Joined: Jul 2007
Posts: 325
Likes: 1
Someone else can chime in though if I'm wrong.
for the 3800 guys thats true, but LS4 platforms no matter the year can be tuned. and yes you can disable via tune
You can unplug the vacuum sensor on the brake booster and that will keep DoD disabled (and set a DTC), but doing so would allow you to test the performance/economy w/o DoD working.
Registered User
Joined: Dec 2013
Posts: 12
Likes: 0
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Teching In
Joined: Nov 2009
Posts: 3
Likes: 0
From: I come from a dusty place.
Any ideas if lets say something wasn't working right if when DOD is enabled it caused the car to use oil or extra crank case pressure?
My wife's 06 GXP at first seems to be thirsty for oil cause around 2000 to 2500 it wants another quart. I have a catch can on the system and it fills up pretty fast even when it's just vented out. It doesn't hold a lot but I'd say 600 miles it's just like 3/4 full.
I'm going to disable the DOD first see if that makes any changes if that doesn't help my choices might be checking cylinders, but it is a bit odd doesn't smoke like using oil at all, Just wondering where all this oil going, lol
Any ideas are appreciated.
My wife's 06 GXP at first seems to be thirsty for oil cause around 2000 to 2500 it wants another quart. I have a catch can on the system and it fills up pretty fast even when it's just vented out. It doesn't hold a lot but I'd say 600 miles it's just like 3/4 full.
I'm going to disable the DOD first see if that makes any changes if that doesn't help my choices might be checking cylinders, but it is a bit odd doesn't smoke like using oil at all, Just wondering where all this oil going, lol
Any ideas are appreciated.
I had a previous smoking issue at idle and low speeds, but relocation of the oil drain plug in the turbo kit resolved it. A leak-down test showed no significant values.
So now I don't know if it's turbo related or DoD. My tuner previously had DoD disabled but I wanted it back. I guess I can try disabling the DoD again and see if the smoking goes away.
TECH Fanatic
Joined: Jun 2007
Posts: 1,316
Likes: 3
From: Dolla$ , TX
https://ls1tech.com/forums/ls4-perfo...ss-impala.html
Read that thread for the most part everything applies
Teching In
Joined: Jun 2013
Posts: 6
Likes: 0
Amen to that... I still haven't figured out where the belt tensioner is. I know it is hydraulic instead of spring loaded like most. I figure its either the small pulley in between the crankshaft and water pump pulley or the small pulley over to the top left of the crankshaft pulley.
Yeah the DOD stays on a lot more around 65. Its weird how the wind drag on the car increases so much past 72-73 mph.
Yeah the DOD stays on a lot more around 65. Its weird how the wind drag on the car increases so much past 72-73 mph.
A forewarning to anyone who needs an LS4 belt tensioner replaced; it is a GM-only part, and if memory serves me, was almost $600 for the tensioner alone. I had an intermittent belt squeal I couldn't diagnose (ended up being the REAR bearing in the alternator), and during the alternator replacement, the local wrenches found the aluminum mounting bracket which is part of the tensioner assembly was cracked. Oh, and if you think it was broken DURING the alternator R&R, I looked, and it showed certain signs of road dirt and engine gunk in between the cracked pieces, so it had been cracked for some time. Local wrench didn't make a dime on that job; he was sick that the tensioner cost that much, and basically halved the labor costs so my bill came in just over 1 grand. I dropped beer and pizza off for the guys the next Friday afternoon.
You have to look around a little for pricing, that belt tensioner can be had from a few sources. Amazon seems to be one of the cheapest.
Teching In
Joined: Jun 2013
Posts: 6
Likes: 0
You have to look around a little for pricing, that belt tensioner can be had from a few sources. Amazon seems to be one of the cheapest.
Amazon.com: ACDelco 12596250 GM Original Equipment Drive Belt Tensioner: Automotive
Amazon.com: ACDelco 12596250 GM Original Equipment Drive Belt Tensioner: Automotive
Registered User
Joined: Dec 2015
Posts: 1
Likes: 0
Amen to that... I still haven't figured out where the belt tensioner is. I know it is hydraulic instead of spring loaded like most. I figure its either the small pulley in between the crankshaft and water pump pulley or the small pulley over to the top left of the crankshaft pulley.
Yeah the DOD stays on a lot more around 65. Its weird how the wind drag on the car increases so much past 72-73 mph.
Yeah the DOD stays on a lot more around 65. Its weird how the wind drag on the car increases so much past 72-73 mph.
Teching In
Joined: Dec 2015
Posts: 2
Likes: 0
DOD @ Belt Have over100k on an 07 ss the dod has been no trouble have to look at the display to see it switch . It motors along in 4 cyl. at 75-80 just fine with good mpg 27-30 if road is flat .I tend to drive it a tad on the fast side so the city& hgwy. avg. is usually 19-22. And your right about the belt it can be fun .There is a tool for it at Pep Boys. Now if the trans would work as good as the dod I would be a happier motorist.