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Path: utzoo!linus!philabs!cmcl2!seismo!harvard!godot!mit-eddie!genrad!decvax!harpo!mls
From: mls@harpo.UUCP
Newsgroups: net.auto
Subject: Transmission problem 85 Buick
Message-ID: <2680@harpo.UUCP>
Date: Wed, 3-Apr-85 13:37:08 EST
Article-I.D.: harpo.2680
Posted: Wed Apr  3 13:37:08 1985
Date-Received: Sun, 7-Apr-85 08:19:44 EST
Sender: mls@harpo.UUCP
Organization: AT&T Bell Laboratories, Whippany
Lines: 36
Nf-ID: #N::72500008:000:1492
Nf-From: !mls    Apr  3 13:36:00 1985

I have a lemon--and 85 Buick Park Avenue with 3.8 mulitport
fuel injected and the 4 speed automatic transmission.  I get
bad front end vibrations whenever the torque converter is
supposely in the lockup mode.  This occurs at around 45 in
speed 3 and around 50 in speed 4.  When I step on the gas slightly
to maintain speed on a slight grade the vibration starts.  It
stops if I let up on the speed or depress enough to disengage
the lockup.  I also found out that the lockup will disengage
if I touch the brake slightly.  That practice drives the cars
behind wild as they see a brake light come on, but I maintain speed.

The dealer keeps suggesting it is an engine miss porblem and put
GUMOUT in the engine to clear the fuel injectors.

I notice that on the distributor there is an unused terminal marked

TACH.  I assume that is for an electrcial tach.  Does anybody have
a circuit to take advantage of that to measure engine RPM?  Or does
anybody know how I would measure as to whether the torque converter
lockup clutch is slipping.  I puut a scope of that TACH lead and I
could get the scope to tripper properly, but I could not get a counter
to trigger consistently because of the transients involved.  Unless
I get some suggestions, I will try to build some circuitry that would
allow a counter to work.  If anybody is aware of a commercial product,
please response with mail, or call collect.

Irv McNair
201-386-4162 day
201-538-2529 home
whuxc!imm
ATT Bell Labs
Whippany NJ 07981