Jerking sometimes?

DANGELL

MEMBER
2004 HYUNDAI SANTA FE
3.5L
V6
2WD
AUTOMATIC
175,000 MILES

Starts drives but will start idle high jerking then check engine light comes on then jerks and stops and light goes off. When on freeway 60 MPH it idles 5,000 RPMs and doesn't seem to shift. Transmission fluid is dirty. Other than that, it's fine.

Sunday, May 7th, 2023 AT 2:53 AM

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
54,138 POSTS

This sounds like an engine misfire which can be intermittent. I would start by doing a tune up which this guide can help with including ignition coils:

https://www.2carpros.com/articles/how-to-tune-up-a-car-engine

This guide can help as well:

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

To confirm the misfire the PCM has stored the code for retrieval.

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

NGK .................... PFR5N-11
CHAMPION .................... RC10YCPB4
Gap .................... 1.0 - 1.1 mm (0.039 - 0.043 in)

Here are the instructions for your car in the images below. Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.

Images (Click to make bigger)

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Sunday, May 7th, 2023 AT 1:40 PM

DANGELL

MEMBER
28 POSTS

Will that also have anything to do with the reason it will not shift from third to Fourth? I went to AutoZone, and it said the code that showed up after trying it several times was the replace wheel speed sensors.

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Sunday, May 7th, 2023 AT 1:55 PM

KEN L

MASTER CERTIFIED MECHANIC
54,138 POSTS

Yep, the engine misfire will affect the transmission shifting. Please upload pictures or videos of the problem so we can see what's going on. Was the code for a misfire?

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Monday, May 8th, 2023 AT 1:21 PM