Did you try to change/check the engine air filter?
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I Googled the problem and found this list of possible causes:
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Why Is My Car Idling Roughly?
While idling in the driveway, your car starts shaking. If that shaking is rough idle, you've got a problem that needs fixing sooner rather than later.
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Have you inspected the transmission wiring harness? There are multiple sensors around the K41B CVT. Lift it up and see where the rocks may have damaged it. Piccies of the transmission if you have time, please.
Which scanner did you use? Some of the more modern/expensive ones allow you to perform active tests to the various systems.
With your scanner, are there any codes set or pending? When you say great gas mileage, it's still around 36mpg city?
Any aftermarket products installed? Any other issues? Were there any issues with the air filter when you changed it? Did you pull the intake tube off and inspect the throttle body fer any issues? Where are you located near? If you are close to Houston, Texas, I could come by and check it out. I don't have a lot of faith in the dealerships when it comes to troubleshooting these days.
Have you inspected/cleaned yer MAF sensor? With yer OBDII scanner, you should be able to monitor the MAF sensor. With the engine idling, it should read near 1.3 grams per second.
You should be able to test the throttle position by removing the intake tube. Ignition on, engine off. With a helper, step on the gas pedal slowly and observe if the throttle body opens correctly. You should be able to also monitor the throttle body and status with the OBDII scanner.
Could you safely shoot some video of the issue and post it? Thanks!
Any aftermarket products installed? Any other issues? Were there any issues with the air filter when you changed it? Did you pull the intake tube off and inspect the throttle body fer any issues? Where are you located near? If you are close to Houston, Texas, I could come by and check it out. I don't have a lot of faith in the dealerships when it comes to troubleshooting these days.
Have you inspected/cleaned yer MAF sensor? With yer OBDII scanner, you should be able to monitor the MAF sensor. With the engine idling, it should read near 1.3 grams per second.
You should be able to test the throttle position by removing the intake tube. Ignition on, engine off. With a helper, step on the gas pedal slowly and observe if the throttle body opens correctly. You should be able to also monitor the throttle body and status with the OBDII scanner.
Could you safely shoot some video of the issue and post it? Thanks!
In post #3 and #16, he did.
There isn't a way to manually adjust the idle as it's controlled by the ECU/ECM. Is the AC on when the issues happen? Have you tried it with the AC off and see if the issues still persists?
I'm going to see if my XTools scanner will be able to give me some data fer you to work with like the MAF readings, TPS percentage at idle, etc.
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