TCC engaging too early

Have a flashing light? Gauges acting funny? Bad idle? Get your problems solved...
Registered User
Posts: 8
Joined: Wed Feb 19, 2003 4:55 pm

TCC engaging too early

Postby joey » Tue Oct 25, 2005 11:03 pm

Hey whats up B friends

I’ve got a 91 beretta base w/ 2.2 engine and a 3t40 3 speed auto tranny. My problem is when im driving through town going 20-25 mph, the TCC decides to lock up- almost like shifting a manual in too high of a gear at too low of a speed. So basically the converter is locked up and the car is in third gear going 20-25. Now this isn’t the classic TCC problem we bnet guys all know too well. (The lockup symptom when hot and stalls engine) I can let off the gas and it will disengage itself; but will immediately lock up again after applying gas. What is weird is that last winter I replaced the computer and the problem went away, it would engage at around 35 which seemed about right; the only drawback is that it contained the wrong memcal chip (it was for a 2.5 I think) The car ran but had missing issues. Transferred my old memcal to the new computer and the missing issue went away but the old TCC early lockup problem was back. Is this a MEMCAL issue or some kind of pressure switch in the transmission giving a faulty signal?

User avatar
Registered User
Posts: 2744
Joined: Sat Mar 23, 2002 1:06 pm
Location: A town up north
Has thanked: 18 times
Been thanked: 11 times

TCC engaging too early

Postby 1988GTU » Wed Oct 26, 2005 12:07 am

I think you can toggle switch the TCC, but I am unsure on your trans due to your year.  I toggled my TCC for my 88 and it worked great, I just had to be the relay.


User avatar
Registered User
Posts: 720
Joined: Wed Apr 25, 2001 5:39 pm
Location: Shelbina, MO

TCC engaging too early

Postby rweatherford » Wed Oct 26, 2005 7:23 am

I would say this could be a MemCal issue.  Hard to tell.

I guess the tranny is original and the speed sensor is fine.  You could check with a scan tool to see if the ECM is reading the same speed as the dash.

Rex Weatherford
92 Beretta GTZ Quad4 Turbo / 5-speed (sold)
Best 1/4 ET =  13.523 @ 105.16 mph

07 Mazda 5 Black on Black (it's slow)

Return to “Diagnostic Help”

Who is online

Users browsing this forum: No registered users and 4 guests