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ase_master327, Shop Owner
Category: Car
Satisfied Customers: 5288
Experience:  +15 years experience on imports and domestics. Bumper to bumper diagnosis & repair.
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2004 Hyundai sonata: car jerks intermittently..40mph..automatic

Resolved Question:

I have a 2004 Hyundai sonata with 60000 miles. The car jerks intermittently between 20-40mph. This happens only when needing to shift(car is automatic). Some days it is real bad and some days it does not do anything. I have taken it to the dealer twice and they changed all the wires and a transmission flush but it is still going on. No codes
Submitted: 9 years ago.
Category: Car
Expert:  ase_master327 replied 9 years ago.

The torque converter is having problems with locking and unlocking.

If the fluid was bad enough to need a flush, then the damage is already done.

A shop will have to be involved. They will have to drive it with a scantool hoked up, so they can verify if it is an electric problem or if it is mechanical...

Since you mentioned a transmission fluid flush...I would expect mechanical problems from the old overheated, burned fluid.

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