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Jerking during acceleration

Tiny
KRISTIESG
  • MEMBER
  • 2015 BUICK ENCORE
  • 1.4L
  • 4 CYL
  • TURBO
  • 2WD
  • AUTOMATIC
  • 93,000 MILES
Typically, it only happens when you are already going 40 or 50 miles an hour and try to pass or go up a hill. Have changed the mass air flow sensor, coil pack, plugs, air filter, throttle body assembly, and did a fuel treatment. Any suggestions on what my next move should be? It does not have an engine code or light displayed.
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Thursday, January 27th, 2022 AT 6:41 AM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
These could be a couple of things but let's start by checking the fuel pressure while this is happening because that is the most likely cause of hesitations.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If the fuel pressure is okay, then we could have a boost issue. However, here is a guide that will cover the other basic things that can cause this:

https://www.2carpros.com/articles/engine-hesitates

If these things are not causing any issues, then we need to check for codes and see if there is anything going on with the turbo.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

If there are no codes, then we need to monitor the manifold pressure with a scan tool and see if there is any movement when this is happening with steady throttle.

This will show us if we have any possible leaks in the charged air side of the system. Basically, that means if you have boost escaping before it gets into the engine then you are going to get surging.

Let's start with this and go from there. Thanks
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Friday, January 28th, 2022 AT 12:21 PM

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