Poor acceleration, engine stalling and sometimes?

2009 HYUNDAI I20

89 MILES • 1.4L • 4 CYL • 2WD • AUTOMATIC

MAZHARKHAN

MEMBER
1 POST

I have no engine check light but whenever i switch off my car A/C the performance of the engine goes down drastically. Poor acceleration, engine stalling and sometimes the exhaust pipe throws out extreme hot air.

Please let me know what can be the issue..

Nov 6, 2023 at 2:22 PM

STRAILER

✓ASE Certified Mechanic
54,832 POSTS

It sounds like the catalytic converter is clogged up but to be sure this guide can help us confirm the issue:

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

You can try removing the primary oxygen sensor to see if it runs better. Check out the images (below). Please let us know what happens.

Image (Click to enlarge)

Professional Diagram for 2CarPros Members
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Nov 6, 2023 at 6:03 PM

JACOBANDNICKOLAS

✓ASE Certified Mechanic
110,193 POSTS

Hi,

I'm struggling to tie the A/C and performance issues together, so please bear with me.

When you scanned for diagnostic trouble codes, did you scan the can-bus? Also, hot air from the exhaust is normal. Do you feel it is excessive?

Here is a link showing how to scan the can-bus. Let me know if this was done.

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Next, I need to know if there are any strange odors, smoke from the exhaust, or sounds when the performance is lost.

Let me know.

Joe

Nov 6, 2023 at 6:07 PM

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