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Slight jerk when releasing acceleration


Bertimus
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Got my 88 back from an extensive tune-up a week ago, haven't really had a chance to drive it until today. On the freeway at higher speeds (70+ mph), I noticed it would very slighty jerk when releasing the acceleration. It accelerates perfectly, the jerk only happens when going from acceleration to coasting. Any thoughts would be greatly appreciated šŸ™šŸ½

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Above lockup speed it could be what you feel when you release the throttle and the drivetrain torque switches from engine driving the wheels to wheels driving the engine.Ā  Torqueconverter is locked and it feels the same as any stick shift car in high gear.

Ā 

Or it could be what you feel when the converter first locks up.Ā  All normal stuff and it it should still be fairly smooth and non jarring.

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14 hours ago, padgett said:

When it happens does the tach drop about 500 rpm ?

TCC, transmission controlled clutch aka "lockup".

No, when releasing the acceleration and transitioning to coast (this is when the jerk occurs) the RPM would only drop by about 75. The biggest drop I observed was 100rpm

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OK note the arrows at the bottom of the service screen. The first (TCC) is the lockup. Does it or any of the transmission gear (4th, 3rd, 2nd) arrows changeĀ  when you feel the jerk ?

Ā 

Loop is Closed Loop and Comp is AC Compressor (also a sight jerk)

Ā 

diagnostics.jpg

Edited by padgett (see edit history)
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2 hours ago, padgett said:

OK note the arrows at the bottom of the service screen. The first (TCC) is the lockup. Does it or any of the transmission gear (4th, 3rd, 2nd) arrows changeĀ  when you feel the jerk ?

Ā 

Loop is Closed Loop and Comp is AC Compressor (also a sight jerk)

Ā 

diagnostics.jpg

Will check asap!

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  • 3 weeks later...

Disclaimer: this is the same outcome repsonse as ROJ forum topic of the same name

Ā 

CheckedĀ out the engine struts and mounts. They were okay. The car was lifted and revealed that the transmission was worked on/upgraded by a previous owner. Thicker/stiffer springsĀ are most likely the culprit of the slight jerk. Totally normal and harmless as far as one can tell.

Edited by Bertimus (see edit history)
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