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When attempting to accelerate there is engine hesitation, why?

Tiny
BENITOV0415
  • MEMBER
  • 2015 SUBARU WRX
  • 2.0L
  • 4 CYL
  • 4WD
  • MANUAL
  • 78,000 MILES
The car drives fine when I don’t get on it. Once I try to give it a little more gas, then it seems to be hesitant around 3,000-4,000 RPMs. No check engine light. The exhaust has a little rattle when I start moving then it goes away.
I’ve changed oil, and spark plugs.
The boost seems to be fine.
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Wednesday, July 19th, 2023 AT 9:29 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,867 POSTS
Hi,

The exhaust rattle got my attention. Do you know if it is a simple heat shield, or does it come from the internal portion of the catalytic converter?

I ask because the inside of the converter can come loose and move around restricting airflow. If that is what is happening, you certainly could feel a power loss.

Take a look at this link:

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

Take a rubber mallet and tap the exhaust to see if you can recreate the sound. This will help pinpoint where it's coming from and if it could be the inside of a catalytic converter.

Let me know

Take care,

Joe
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Thursday, July 20th, 2023 AT 7:37 PM

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