Engine hesitates then has spikes in RPMs

Tiny
THECURIEL
  • MEMBER
  • 2014 CHEVROLET IMPALA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 182,000 MILES
When I’m driving the car will hesitate around the 2,000 RPM mark to then suddenly have a spike to around 4,000-5,000 RPMs and jerk somewhat aggressively sometimes, and also when I step on the gas it feels like there’s a small delay for the car to react compared to other cars I’ve driven (might be in my head). There’s also been occasions (like 2 or 3 times) when I’m driving and I step on the gas to have no reaction at all for like 3 seconds and then the car will accelerate. The hesitation will happen more often when going uphill and the car will start to jerk. I’ve gone to 3 mechanics and they tell me to wait for the check engine light to appear for them to be able to do something to it since currently it doesn’t have it turned on but it’s had this problem for maybe close to a year without the check engine light going on. I’ve been told I should go to a transmission mechanical shop to get the transmission reconstructed to see if that helps but it’s expensive and it might set me back which I don’t mind if it’s for sure that it’ll fix it but I want to know if maybe there’s something else that might be the issue before doing that.
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Wednesday, May 5th, 2021 AT 5:45 AM

1 Reply

Tiny
KASEKENNY
  • EXPERT
This sounds like a torque converter issue. If you or a shop has a scan tool that can monitor input shaft speed (Engine RPMs) and output speed you can calculate the torque converter slip when this is happening.

However, most scan tools will do this for you and show you TCC slip. When the transmission is locked up in overdrive there should be minimal slip and I suspect you will have quite a bi.

If not, below you will find the testing that we can run through as well for the torque converter.

Let us know what you find with this and we can go from there. Thanks
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Thursday, May 6th, 2021 AT 7:18 PM

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