20 Most Recent 1991 Geo Tracker Questions & Answers

old post tracker day.
The makers of the top , has free instruction online
is it a BEST TOP/
google that. "BeST Top instructions,"
I got mine that way, in 5min work.

1991 Geo Tracker | Answered on Oct 22, 2016

yes those chem, melt seals. and do that.
the front seal has nothing to do with the rear vacuum
modulators, that love to leak, outs to the hose, and make engine smoke or leak to inside (unseen) and upset shifting .
the transmission needs service
the correct name for it is the 3L30. (old TH180 that started back in
1969-1975 Opel Olympia / Kadet)
the 3L30 has a special rear flange for 4wd. and special rear shaft.
any major transhop can in fact overhaul any TH180 based transmission.
is the full list of cars with this trans (based)
here (even my USPs mail man has one)

1991 Geo Tracker | Answered on Oct 21, 2016

all 5 lamps work in hAZ but not ever blinking? all are dead, not dim?
or action odd. like flashing way too fast?
the full schematic is here. (correct and below)
see pdf page 13, this is the real schematic.

see page figure 4
see that there is a haz fuse and turn/ back fuse.
bingo , no?
have you lost the fuse box cover, like 99% of everyone?
and lost the operators guide, we have both .

see turn/back here. (next is lost panel, photo)

lost that?

the 5 lamps are 1 in dash cluster, and 1 one each corner for.
if the TURN fuse blows again, ask how to find that.
that is a longer story and is covered here.
Shorts !


1991 Geo Tracker | Answered on Jun 30, 2016

the 1991 G16a has a pig tail connector, must have 4 wires.
and shares the Injector connector (tricky pin pulls, and all)
that connector you gander is the injector /TPS connector
it has 6 pins but only 4 are for TPS. (yellow /.red are injector)
see page 3 below, for what all this means. last link below.

try to keep in mind, your car has a VIN engine code U (not 6) code 6 , has no pig tail, TPS.
GM uses U code to say, engine is 8valves, TBI, G16a , my guess, (no photos) is your bought TPS is
with tails, and is correct for your 8v engine.

Install, (need feeler gauges to do it)
it's not just thrown on to the car, it must be calibrated.
or the idle switch WILL fail.(and more)
one maker of this TPS is here: (hard to find)
SMP makes one. sMP #TH-147 is for 8V tbi.

do not use 16valve parts on your car.

here is the calibration steps.

the factory page is here


and page 3 here

the last page shows the tricky pin pulls....

you must pull the old pins.' one by one.
then put in then new TPS pins , in the same places of old
matching COLORS.
then do the calibration steps above, using feeler gauges.
same basic steps, from 1989 to 1998.
in 1999 they calibrate it to 0.5vdc, only.
later years, it auto-calibrates.
if the new TPS fails to cure the problem
post the symptoms, and win.

1991 Geo Tracker | Answered on Jun 17, 2016

old post
type schematic in box
91 has full,

easy peasy japaneezy

1991 Geo Tracker | Answered on Jan 17, 2016

old post.
BY DESIGN. 91 is 8v TBI and does it more,(laws here force that with wet inducted fuel TBI (read nasty smog engine,cold)

turn key in say alaska (yah cold. start say 2000 rpm and in 3 to 30 seconds, drops to say 1500, (dash pot did that by ECU commands)
then the IAC rules the roost a thermal device that opens even more at -10c , and races, until it hits 158F and closes
then ecu wakes and controls idle speed by software and regulates at 800rpm
all do that. Brand new. or in perfect running order,

if the 91 ever gets vacuum leaks
it will race fast hot and cold
with full power and no misfiring.
with leaks like that the ISC VALVE GOES OUT OF CONTROL.

1991 Geo Tracker | Answered on Jan 17, 2016

old post 1991 a 8valve engine????
it ran before? or not? if not you did the diagnosis wrong, ask?
does it crank? no, then.
if you read the fsm it said disconnect battery first.
forget to put it back?
keyon, CEL lamp glows, it must or you blew up to 3 ECU fuses.
say it cranks,
fuel pressure not 34psi but 0 or 10
you did it wrong.


the first test for dead fuel system after proving
that is what
check output of fuel pump relay for 11 to12v cranking
if good the at pump. actual
if no power to pump all old and new pumps are useless
ask how to finish this process..

1991 Geo Tracker | Answered on Jan 17, 2016

old post
your car IS not a 91, its 96+ so....answering for 96+
trans failure
verbatum FSM book
P0741 Torque Converter Clutch (TCC) Circuit Performance or Stuck Off

the tests are easy with voltmeter
covered pretty well here


1991 Geo Tracker | Answered on Jan 17, 2016

they have factory and live data, off new an old sensors
iat and ect


hot engine btw is 300 ohms
if not in USA, they run some odd sensors in say Europe.
but yours is USA or Canada, so above

1991 Geo Tracker | Answered on Jan 17, 2016

old post
well there are many places for steering to go loose.
a mech finds that exact spot, first.
you didnt so there will be no answers
its a hands on deal.

when we find that SPOT
we replace the part that is bad.
even tilt steering parts
i count the spots.
over 12.
if you need training on suspension and steering inspection
i can direct you to ASE pages.

1991 Geo Tracker | Answered on Jan 17, 2016

very old post


answer'g form both dead, L and R, you did not say.....

custom dawg, drawing just for early trackers, sidekicks

is not fuses , power is shared with 2 fuses
its not ground , as it too is shared, L and R, and high and low.
so what is it, easy bad head light switch.

1991 Geo Tracker | Answered on Jan 17, 2016

Then perhaps you need to call a mechanic or your dealer

1991 Geo Tracker | Answered on Oct 10, 2015


1991 Geo Tracker | Answered on Feb 24, 2015

Change wire if still no spark check distributor

1991 Geo Tracker | Answered on Feb 22, 2015

Shift siloniod

1991 Geo Tracker | Answered on Feb 22, 2015

Not if everything bolts up ur park reverse neutral and drive won't be the same on shifter without changing the dash cuslet

1991 Geo Tracker | Answered on Feb 22, 2015

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