Hesitation while driving?

BHAMDOC1973

MEMBER
2015 VOLKSWAGEN CC
2.0L
4 CYL
TURBO
2WD
MANUAL
146,000 MILES

This is a manual transmission car, while driving if you hit the throttle especially when car is not fully warmed up you get this feeling of a shudder that is similar to one you could experience in an automatic car. I am 100% it is not related to the transmission but rather the engine. I changed all spark plugs and coils just in case, same results. No codes at all.

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,665 POSTS

Let's use a CAN scanner to help count the misfires. If the problem is spread out enough it will not cause a code, but the misfires should count. I would connect a scanner and read the live data. Also, can you feel the turbo kick in while accelerating? If not, the turbo could be bad which I would remove the inlet or outlet pipe to check the turbo endplay. CAN scanner (Controller Area Network) which will work on most cars from Amazon.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

This guide can help:

https://www.2carpros.com/articles/how-turbo-chargers-work

Please upload videos of the problem so we can see what's going on.

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Tuesday, December 19th, 2023 AT 1:23 PM

BHAMDOC1973

MEMBER
1,575 POSTS

No, I hear the turbo and feel it. No leaks and I don't think it's a vac leak or a misfire. Car super smooth as far as engine and under load a misfire usually would show on scanner or check engine would flash if am not mistaken. Am leaning towards the intake manifold and the updated ones being much better for carbon build up. Changed one before on a car and made a lot of difference. I may end up pulling it out at these miles. Here are few videos showing no misfire counts under advanced live data.

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Tuesday, December 19th, 2023 AT 1:51 PM

KEN L

MASTER CERTIFIED MECHANIC
47,665 POSTS

Thanks for the videos, it helps. I have seen the MAF sensor cause this problem because the sensor wire goes bad at it shows less air going into the engine. That actually is which makes the computer give the engine less fuel. At this point cleaning it will not help, and the sensor needs replacement. You can compare the readings from the new sensor to the old one to confirm the sensor failure. Check out the images (below). Please let us know what happens.

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