MY GEO TRACKER SHUT DOWN AFTER 3 MINUTE. I WAIT 5 MINUTE MORE TO TURN ON. AGAIN AGAIN & AGAIN. IT HAVE CURRENT IN SPARK PLUG. THE ONLY SYMPTOM IF GASOLINE STINK

On most inline engines the general rule is as follows. Stand with the engine belts and pulleys nearest to you and look across the length of the engine towards the gearbox. 'Number One' cylinder is usually the one nearest to you and numbered away from you towards the transmission housing. On a Geo Tracker that will most likely be the one nearest the grille on the front of the vehicle.

(work?, dead, flash too fast, stuck on? or are dim?)
fuse blown above left knee.
the schematic is here.
http://www.fixkick.com/ECU/89/1990-scan-ECU/89_elect3a.jpg

the lost panel cover?
http://www.fixkick.com/ECU/89/Fuse-with-diag.jpg

fuse, then wiggle the hanzard switch 5 times.? cycle it
they get dirty, in 24yrs. then the blinker relay model
and last the combo switch bad.

watch out for shorted blinker lamps. (over twisted, they short)
and causes the module to just shut down.
test eash lamp by hand, to be sure its really good.

Pull the shifer back out look inside with a lite and sure all shift rails are in the nuetral position and install the shifter carefully into the hole alining it with the shifter rails.experiance is neededJohnny

5/8 plug socket a 9 inch extinction 3/8 ratchet pull 1 wire at a time and change them

the gap is .028

always cyl 1
8 at 800 rpm

0.42

You need to conduct tests to be sure where the trouble is.
1. Spark test: remove the number one spark-plug, and hold it to the engine block. then ask a friend to crank up the engine..
2. If the system is good, you should see steady blue sparks. If you don't, then you would have to work on your ignition system.
3. Fuel test: get a can of 'starting fluid' or the common 'choke and throttle-body cleaner'.
4. Unbolt the clamp holding the air-intake hose to the throttle-body. Pull back the hose to expose the inside of the throttle-body.
5. Spray a good quantity of the cleaner into the body.
6. Re-attach the air-intake hose, and try to crank up the engine again.
7. It will show some hesitation, but keep cranking until it fires up, and able to idle.
8. If the throttle-body and the manifold are dirty, the choke cleaner should help.
9. Please get back to me if necessary.

you need to post
8vlave
or 16valve motor

they can be either.

but there are 50 things that can kill idle.
air leaks
ISC valve stuck
ignition timing too far advanced a idle.
and many more
tell more , get more.

If plug wires are arcing at any point, replace plug wires and recheck.