Bertimus Posted January 18, 2021 Share Posted January 18, 2021 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 šš½ Link to comment Share on other sites More sharing options...
padgett Posted January 18, 2021 Share Posted January 18, 2021 Lockup ? 1 Link to comment Share on other sites More sharing options...
DS_Porter 89 Burgandy Posted January 18, 2021 Share Posted January 18, 2021 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. 1 Link to comment Share on other sites More sharing options...
Bertimus Posted January 19, 2021 Author Share Posted January 19, 2021 @padgettcan you elaborate on "lockup"? Link to comment Share on other sites More sharing options...
Bertimus Posted January 19, 2021 Author Share Posted January 19, 2021 @DS_Porter 89 BurgandyBurgandy Ā It is definitely non-jarring. The car still drives great. It's just now that I've noticed it, I can't unnotice it! So will be taking it to the mechanic on Friday, I will post updates! Link to comment Share on other sites More sharing options...
padgett Posted January 19, 2021 Share Posted January 19, 2021 When it happens does the tach drop about 500 rpm ? TCC, transmission controlled clutch aka "lockup". Link to comment Share on other sites More sharing options...
Bertimus Posted January 20, 2021 Author Share Posted January 20, 2021 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 Link to comment Share on other sites More sharing options...
Bertimus Posted January 20, 2021 Author Share Posted January 20, 2021 (edited) Also, I madeĀ an interesting observation today: Ā The slight jerk very muchĀ seems to only happen when the road is level or on a decline. I did not notice it on inclines. And like before, it doesn't not happen at all at slower speeds. Edited January 20, 2021 by Bertimus (see edit history) Link to comment Share on other sites More sharing options...
padgett Posted January 20, 2021 Share Posted January 20, 2021 (edited) 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 Edited January 20, 2021 by padgett (see edit history) 1 Link to comment Share on other sites More sharing options...
Bertimus Posted January 20, 2021 Author Share Posted January 20, 2021 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 Will check asap! Link to comment Share on other sites More sharing options...
Bertimus Posted February 9, 2021 Author Share Posted February 9, 2021 (edited) 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 February 9, 2021 by Bertimus (see edit history) Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now