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2014 Silverado 4.3 RPM fluctuating while coasting 35-40mph

starzky

By starzky
in Engines & Drivetrain

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starzky New Member

starzky

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Title says it all really. When I take the foot off the pedal around that speed it's bouncing approximately between ~925-1250 RPM. This also has been intermittent. At times it happens and others it may not.

 

Truck has 99k miles. Towed 2-3k lbs a few times only. 75% city driving. Changed transmission fluid at 99k as well. 

 

To tell you the truth I can't say for certain how long this issue has been occurring. I'm pretty certain it's been some time, except it's since the trucks really approached the 100k mark that I've been really looking into the long-term problems that can arise with the truck, so I've been a lot more attentive with these smaller details.

 

Is this in relation to the torque converter? Other than this I feel the truck's shifting has been just fine. I've installed the superior solutions kit, but as I've discovered, the 4.3 does not have an auxiliary cooler like the V8s do, so I'm installing a katech 170° thermostat to hopefully remedy the hot trans issue.

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
15 hours ago, starzky said:

Title says it all really. When I take the foot off the pedal around that speed it's bouncing approximately between ~925-1250 RPM. This also has been intermittent. At times it happens and others it may not.

 

I'd bet if you took closer notice, you would find that the 'intermittent' part will be tied to uphill or downhill and on cruise or not. At the speed you note there is a lot going on. A down shift, AFM going on or off. Converter locking and unlocking as commanded by the other two and the order they happen in. I know it's there with mine but hardly notice it unless I'm looking for it. 171K on mine. 

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