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Vz tranny/torque converter issue

supercharged jim

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Hi guys I've got a v6 Vz berlina it has 318ks but drives tight as new
But
I'm having a strange issue when the torque convertor locks and unlocks on the highway.whats happening is I'm feeling a thump thump,not vicous but really noticeable...I only notice it when I'm cruising,if I'm a bit hard on the throttle it's not an issue..box shifts smooth,hot or cold,up or down,thru all gears other wise
Any tips guys
Cheers
 

monkey

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My tip would be look at fault codes first. I know its a different engine but i had that exact problem in a VS. Was fine as long as it was under load. Thought it must be trans or torque converter related, turned out to be crank angle sensor.
 

supercharged jim

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Yeah cheers
ITs getting codes read today due to the annoying SVS on the cluster
 

supercharged jim

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I had codes and all it threw was oil pressure sensor which I replaced
Mechanic is thinking clutches in converter
 
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