Disable V4 mode?

fishrman · August 13, 2020

On 6/25/2020 at 3:28 PM, carnau said:

Check out the Range AFM disabler. ( https://amzn.to/37ZYQgJ ) I am actually doing a review video on it now. I hate to send it out because it's still not complete and private at the moment. But if you're interested send me a privcate message and I will give you a link. I will upload it here when I am completely done with it. Should be this weekend when I am done and have it completed.

Sooo, this is something that cost about 200.00 bucks to disable the 4 cylinder option? Not sure it is worth that to me when Chev. built it the way they built it. Seems like it should be their problem and not mine!

flyingfool · August 14, 2020

try 5th gear, its free.. or buy a used MPVi from HPtuners for like 100 bux in "ebay or ls1.com forum" and turn it off thru software

https://www.ebay.com/itm/HP-Tuners-MPVI-for-GM-VCM-Suite-Editor-Scanner-Tuning-Platform/383676062795?hash=item5954e01c4b:g:0IAAAOSw6qtfNYvM

Edited August 14, 2020 by flyingfool

fishrman · August 14, 2020

37 minutes ago, flyingfool said:

try 5th gear, its free.. or buy a used MPVi from HPtuners for like 100 bux in "ebay or ls1.com forum" and turn it off thru software

https://www.ebay.com/itm/HP-Tuners-MPVI-for-GM-VCM-Suite-Editor-Scanner-Tuning-Platform/383676062795?hash=item5954e01c4b:g:0IAAAOSw6qtfNYvM

Would you suggest starting out from a dead stop in 5th gear?

flyingfool · August 14, 2020

i always do... i usually use 4th gear in stop and go traffic, 5th gear for city driving with faster traffic, and 6th gear for the highway and V4 afm activated to sip that gas..

Edited August 14, 2020 by flyingfool

fishrman · August 14, 2020

15 minutes ago, flyingfool said:

i always do... i usually use 4th gear in stop and go traffic, 5th gear for city driving with faster traffic, and 6th gear for the highway and V4 afm activated to sip that gas..

Do you think this would solve my issue? My 2017 with only 7000 miles on it now, is still doing what it has since day 1. The technician told me in May of this year that I should drive it harder and that it was something to do with it wanting to go or going into 4 cylinder mode. I notice the "vibration" or "hesitations" when I first start it up in the morning. I will notice it immediately as I start to accelerate and will notice it "bucking" or hesitating up to about 35 or so for the first 5 or 10 minutes and then it drives like a normal truck again. They told me in may that in 6 months I wouldn't notice it anymore (guess they were trying to brush me off). My thoughts are, if it actually had anything to do with the 4 cylinder mode then why don't I notice it after it warms up?? It is a 6 speed transmission and they tell me that Chev. has no service file bulletins on them and it is just for the 8 speed as far as changing out the transmission fluid to Mobil 1.

flyingfool · August 14, 2020

yeah i would get a lot of hesitation before when i drove in town in Drive or 6th gear. it was dangerous when in busy traffic situations. now i only use 4th gear is busy traffic, it really wakes the truck up!

if your willing to spend $200 bucks , i recommend getting a throttle enhancer, this will really fix a lot of lag on the pedal. dont waste money on the AFM disabler.

after that have a local mechanic pull out the tranmission thermostat and plug the pi-pass in the cooler line, this will also improve the shifting pattern. should be noted the torque converters are a common failure point on 6 & 8 speeds, so go easy on them, minimize your hotrodding until you upgrade this part

Edited August 14, 2020 by flyingfool

fishrman · August 14, 2020

1 hour ago, flyingfool said:

yeah i would get a lot of hesitation before when i drove in town in Drive or 6th gear. it was dangerous when in busy traffic situations. now i only use 4th gear is busy traffic, it really wakes the truck up!

if your willing to spend $200 bucks , i recommend getting a throttle enhancer, this will really fix a lot of lag on the pedal. dont waste money on the AFM disabler.

after that have a local mechanic pull out the tranmission thermostat and plug the pi-pass in the cooler line, this will also improve the shifting pattern. should be noted the torque converters are a common failure point on 6 & 8 speeds, so go easy on them, minimize your hotrodding until you upgrade this part

so, start out in 4th or 5th in town and that will make things better? Don't think I should have to spend any money to make things better----it is a Chevy problem that I shouldn't have to be dealing with! The idea of the thermostat is interesting to me on the transmission. I doubt I could get Chevy to listen to that idea but I could see that as a potential issue since it runs fine once it gets warmed up. They won't acknowledge there is a problem with the 6 speeds only the 8!

flyingfool · August 14, 2020

Chevy wont accept this is the problem, because it's way too expensive to fix, and most trucks are clearing the warrantee limit with defective parts. grumpy bear posted a tech paper on the issue , let me dig it up for you to read up on..

https://www.sonnax.com/tech_resources/845-6l80-6l90-transmission-tech-advisory-consider-an-updated-converter-in-your-next-rebuild

fishrman · August 14, 2020

17 minutes ago, flyingfool said:

Chevy wont accept this is the problem, because it's way too expensive to fix, and most trucks are clearing the warrantee limit with defective parts. grumpy bear posted a tech paper on the issue , let me dig it up for you to read up on..

https://www.sonnax.com/tech_resources/845-6l80-6l90-transmission-tech-advisory-consider-an-updated-converter-in-your-next-rebuild

So, I am not sure my transmission is the one they are referring to in that tech paper and not sure, even if it is, that is the issue with mine as mine seems to have had the problem since day 1. I was told that mine was a 6 speed transmission and there was no service file bulletins related to them---only the 8 speed.

flyingfool · August 14, 2020

5 minutes ago, fishrman said:

So, I am not sure my transmission is the one they are referring to in that tech paper and not sure, even if it is, that is the issue with mine as mine seems to have had the problem since day 1. I was told that mine was a 6 speed transmission and there was no service file bulletins related to them---only the 8 speed.

you have the 6l80 if its a 1500 truck with 5.3 or smaller engine. there wont be any bullitins.... no one is talking about it, GM doesnt want it even to be discussed. like i said too expensive to do a recall on all 6 or 8 speed trans...

Edited August 14, 2020 by flyingfool

fishrman · August 14, 2020

8 minutes ago, flyingfool said:

you have the 6l80 if its a 1500 truck with 5.3 or smaller engine. there wont be any bullitins.... no one is talking about it, GM doesnt want it even to be discussed. like i said too expensive to do a recall on all 6 or 8 speed trans...

So, mine is still under warranty with only 7000 miles on it with a dealer telling me that is just the way it is basically. I have had lots of new vehicles and this is the first new truck I purchased for a retirement gift to me. I have never had issues like this one is having. To me, when you put it in drive, it should run down the road and not hiccup and hesitate for the first 10 minutes while it is warming up. They blame trying to get the most fuel economy out of them now days is the reason it does it. I just bought a new 2020 Jeep Grand Cherokee and it doesn't seem to have those issues! Do you have any suggestions on what I should do or who I should contact?

flyingfool · August 15, 2020

just fix it , call a lawyer to influence GM to cover 80%

Grumpy Bear · August 15, 2020

Did you know that when the AFM cycles the torque converter clutch cycles to buffer the exchange? You can't actually feel the AFM. You are feeling the TC clutch.

flyingfool · August 15, 2020

i never knew that.. all the more reason not to drive around in 6th gear to minimize wear on those components until you actually need the fuel efficiency.

Edited August 15, 2020 by flyingfool

flyingfool · August 15, 2020

16 hours ago, fishrman said:

So, mine is still under warranty with only 7000 miles on it with a dealer telling me that is just the way it is basically. I have had lots of new vehicles and this is the first new truck I purchased for a retirement gift to me. I have never had issues like this one is having. To me, when you put it in drive, it should run down the road and not hiccup and hesitate for the first 10 minutes while it is warming up. They blame trying to get the most fuel economy out of them now days is the reason it does it. I just bought a new 2020 Jeep Grand Cherokee and it doesn't seem to have those issues! Do you have any suggestions on what I should do or who I should contact?

the next option is to have a tuner, repair the software that GM has designed for fuel efficiency and emmisions compliance. this is the real reason the trucks are a mess. you will Void warrantee but will be much happier in the end. Blackbear perfomance or EFILive recalibrate the ecu and tcu for correct operation that you are expecting and they add a little more punch too.

Edited August 15, 2020 by flyingfool