RPM/Throttle blip

[Helo driver]

Going down a steep road, I downshift to 3rd, about 35 mph. The engine rpm’s bump up 75 to 100 rpm every 2 to 3 seconds, just like if you tapped the throttle. This only happens in 3rd gear. Kinda defeats the purpose of downshifting! Anyone else experience this?

 

[1955moose]

What year is your Suv. Going downhill is going to raise the Rpm some. It's possible you've got a problem with the throttle body. What codes come up on a scanner?

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[Helo driver]

2017..no codes. This happens when I use the thumb switch to downshift. I just tried putting it in manual position and it held the rpm. Weird...

 

[T Money]

I just experienced this with my 2016 expy. I had to ride the brakes down the mountain to avoid this. My rpm surges were more like 300!

 

[Helo driver]

It’s a bit disconcerting for sure! Local dealership doesn’t have an answer for it either. I guess it’s an issue with the ECM? Who knows.

 

[1955moose]

How bout pulling the battery cable, and let the computer try to reset the parameters. Couldn't hurt!

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