I have a 1993 jeep gc lerado and it has a hard time shifting Only when it is warm. Just had to change the ign. coil because of a starting problem and now I have this tranny problem. I undid the battery while working on it. shift great when it is cold. 4.0 litre and asian tranny.

are you doing spark or timing a cam? what? what is JOB?
it dont matter, the engine, ecu does that, (magic)
but if it has a coil pack like my 3.8 then the coil pack must
be wire right and is marked. clearly on the pack.
they have USA jeeps and Export. country never stated here. sad huh?
and use differnent spark systems (3 types used, but 2 common)
per below.

v6.
is this not a Cheokee? the non Grand ended in 2004. so...
ill go with GC 2005, v6 3.7L
the v6 began in 2005, not 2004, but, maybe yours is the first./

the 3.7 has coil over plug, spark, 6 coils.
and the harness is fixed to those coil so all firing order are
dictated in the ECU/PCM (hard coded)

VIN engine code, K. (not stated)
http://www.fixya.com/cars/t13893405-firing_order_diagram_3_7l_jeep_2006

and already asked, and answered .

my 3.8 (2004) jeep.
is 1,2,3,4,5,6
and is like this.

mine uses wasted spark system.

http://www.fixkick.com/look/odds-ends/jeep/2008-JK/slideshow/firing-order.JPG


so post VIN, or tell what engine is really there.
and the true year. or build date (sticker)

so my answer is.. 2005 GC, 3.7L V6, not I-6
it has 6 cops, "coil over plugs" 6 induction coils
and runs same firing order, as the old I6 did.
1-5-3-6-2-4
but the I6 4.0liter runs a coil pack and is quite different.
these;


times 6
all laced in, hard.

Any chance you have a check engine light on ?
If so I would have the computer scanned for trouble codes.

Have your ignition module checked. Also check codes for bad reference signal for cam or crank sensor.

Look into the crank sensor or an ecu that needs repairing. Those two, being bad, will cause a no spark condition in your jeep.

possibly dirty fuel injectors. try adding some fuel injector cleaner. best boughtin 3 packs at Walmart, etc.

Sounds like a shift solenoid. They are not too expensive and fairly easy to install. You will need to drop the pan and then you should be able to see the solenoids. But, before you do, put a scan tool on it and make certain. Good Luck

Sounds temperature related. That's just about the amount of time it takes for the engine to warm up and change computer modes. It's possible that you have a lazy temperature sending unit. They aren't very expensive or difficult to install (assuming you have a 4.0, its right next to or on the thermostat housing.) They can be tested using a digital volt/ohmeter.
As it's running well at all other times, if it's not the sender, it will require lots of careful testing and a code scan and may be difficult to find since you only have a narrow "window" where testing will show the problem.
Good luck

You need to check components again when the engine is hot and in no-start condition, otherwise, you will get bad info...obviously whichever part is doing this works fine cold. ones that react most to heat are crank pickup, ignition coil and the fuel pump.(bad ones get hot and bind up)

Try removing each sensor plug and blowing both sides out with compressed air (even a bike pump is better than nothing) Your computer system works on subtle changes in low voltage circuits Water throws all right out the window. Also dry off cap and rotor, including ign wires to avoid high tension crossover. And, don't wash it again...a dirty jeep is a happy jeep!!!

any local auto parts store or maybe even walmart