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2020 GMC ZRX

Cam C.
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Cam C. Enthusiast

Cam C.

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Posted

2020 GMC ZRX (Supped up AT4) RPM’s fluctuate up and down almost making the sound of a 6.2 with a cam in it. The RPM’s drop significantly almost causing it to stall sometimes when doing the following; idling, coming to a stop, when you press the accelerator attempting to make it downshift, and when going up a hill. Also it tries to stall sometimes even with no change in throttle, terrain, or speed as if it’s taking the pedal away from you. Gas mileage and power decreased significantly since this first occurred. Forward gears 3-5 stick when you get in it a little going up a hill (only happens on a hill) and I have to let off the gas and ease back into it to get it to shift. No problems or misfires whatsoever when starting and it has never actually stalled out all the way. Also, now when I come to a stop I can hear it down shifting and running through the gears. It runs perfect when I get into it and the rpm’s are high, but when they are low is when the problems occur. I can also hear a little tick like a misfire every once in a while when accelerating. Not throwing any codes or check engine light. I’m thinking something with fuel management/distribution, combustion, air leak, or something simple

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Jay P Enthusiast

Jay P

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Posted
4 hours ago, silveradosid said:

is this a 2020 or a 2023, you posted 2020 but under your name its 2023

I think it must be a 23 since the 1500 ZR2/ATX didn't come out until 2022 model year.

BIGDOGx Senior Enthusiast

BIGDOGx

Posted
Posted

No warranty left on it?

 

Sounds to me like it should be kicking a code if the engine sounds like it is cammed and has that lump type sound. I can speak from experience that it is not a normal 6.2 issue, at least not in the 10 years i have owned one. Seeing as you are also experiencing Trans related issues could this be a ECM type computer related issue?

  • 3 weeks later...
Cam C. Enthusiast

Cam C.

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On 10/19/2024 at 6:05 PM, johnnyquick said:

What if any engine mods have you done?

Maf or Throttle body?

None.

Cam C. Enthusiast

Cam C.

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On 10/20/2024 at 6:44 AM, silveradosid said:

is this a 2020 or a 2023, you posted 2020 but under your name its 2023

It’s a 2020 ZRX (made by Tuscany). Idk how it had 2023 I guess I typed it wrong because I have a 2023 AT4 also.

Cam C. Enthusiast

Cam C.

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On 10/20/2024 at 11:42 AM, Jay P said:

I think it must be a 23 since the 1500 ZR2/ATX didn't come out until 2022 model year.

It’s a 2020 ZRX by Tuscony. Everyone thinks I got the name wrong so don’t feel bad. There are only a handful of them being made every year. They start as an AT4 then Tuscany turns them into a ZRX at their factory.

Cam C. Enthusiast

Cam C.

Posted
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On 10/23/2024 at 11:56 AM, BIGDOGx said:

No warranty left on it?

 

Sounds to me like it should be kicking a code if the engine sounds like it is cammed and has that lump type sound. I can speak from experience that it is not a normal 6.2 issue, at least not in the 10 years i have owned one. Seeing as you are also experiencing Trans related issues could this be a ECM type computer related issue?

I have no idea honestly I was just seeing if anyone else had experienced similar issues before

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