'93 auto trans issue, clunk
Thread Starter
Pro
Joined: Mar 2009
Posts: 702
Likes: 259
From: Middletown Delaware
'93 auto trans issue, clunk
This issue only happens when the car is cold (coolant temp below 100). Start the car put it in Reverse to back out the garage, all is normal. Put the car in Drive to leave and hard "clunk". Transmission doesn't want to come out of first gear and when it does appears to be stuck in 2nd gear. Here is the kicker.... anytime this occurs if i stop the car, SHUT the engine down, wait 5 seconds, restart the car and the transmission goes into Drive without any abnormal clunk and the trans shifts perfectly...all day long.
I even tried resetting the TV cable twice which doesn't help.
What is going on here? Is the ecm locking the torque converter up on cold start? i don't get it. Trans has been working perfectly up to this point. The car has 60K original miles. This problem has only occurred after the intake manifold gaskets were changed
I even tried resetting the TV cable twice which doesn't help.
What is going on here? Is the ecm locking the torque converter up on cold start? i don't get it. Trans has been working perfectly up to this point. The car has 60K original miles. This problem has only occurred after the intake manifold gaskets were changed
Last edited by Ozzstar; Apr 30, 2015 at 09:12 PM.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
Sorry. Couldn't resist...
The brake pedal should disable the TCC, so try that and see if you still get a clunk.
On my car the TCC control line is connected to a pin in the ALDL connector. You could monitor that pin with a test light (assuming yours is similar to mine) and see if the TCC is turned on at startup.
Thread Starter
Pro
Joined: Mar 2009
Posts: 702
Likes: 259
From: Middletown Delaware
You need to put the old intake manifold gaskets back on.
Sorry. Couldn't resist...
The brake pedal should disable the TCC, so try that and see if you still get a clunk.
On my car the TCC control line is connected to a pin in the ALDL connector. You could monitor that pin with a test light (assuming yours is similar to mine) and see if the TCC is turned on at startup.
Sorry. Couldn't resist...
The brake pedal should disable the TCC, so try that and see if you still get a clunk.
On my car the TCC control line is connected to a pin in the ALDL connector. You could monitor that pin with a test light (assuming yours is similar to mine) and see if the TCC is turned on at startup.
I'll look into the ALDL idea, thanks for the suggestion. I purchased 7 quarts of transmission fluid and think I will order an AC Delco trans filter from willcox or ecklers. I am not impressed with the crap autozone and napa are selling. I would even use a wix if i could find the correct filter that fits.
Did some forum searching and jrockford on this site had the same exact problem my car is experiencing I hope he is still active here and can give me some more feedback... https://www.corvetteforum.com/forums...g-strange.html
Take it easy- Ozz
