Transmission changed in 1993 jeep grand cherokee, ran 200 miles and engine stopped, and will not start again, loss of spark. Turns over fine, just will not ignite,changed timing sensor....what else could be the problem?

2001 no engine stated. sad.
welcome to computer shifted gear box.
its called a TCM
it does all shifting
so scan the PCM and see why
you cant fix modern cars lacking a scan tool

the engine is misfiring, has 50 causes.
it not the transmission
transmissions can only shift up if the engine makes full power.
it's not making full power, fix the engine, EFI
scan it. ok?



we have posted misfire posts here 100s of time's in fact its endless..
short list.
full tuneup done.
engine gets to 180f and not running cold all the time, scan it to see that. (data scans)

ECT reads 180f.? good or above. and holds
ECT reads low but thermal gun shows say 180f
oops ECT is bad.

no DTC errors stored?, I bet there are.
4.0L coil pack bad?
sparks are new you said.
fuel pressure way too high.?

to scan it , drive to driving cycles.
many errors are not reported with just one drive cycle.
Misfire, errors, DTC P030x , takes 2 full driving cycles , cold to hot engine, and more rules, read misfire, monitor rules in SM.


The engine light starts flashing

that means the EFI system detects gross misfiring
the flashing part means, if you read the opr guide, or SM
that its my damage the CAT converter, due to overheating, it.
it says, there, drive easy to service shop.

the lamp also means and proves the errors
are there stored in the ECU memory called DTC errors.

but if you keep doing driving cycles, they can clear , causes this evidence to erase.
fools many folks this auto clear features.

owning a real scan tool avoids all this , dancing about.

I'm having a problem with my tranny not wanting to shift automatically at all. Seems like a dead stop its stuck in low gear. Have to manually shift and does not go into overdrive. I have a 1993 Jeep Grand Cherokee. Can anyone help me cause I've swiched out throttle control sensor, filter change, new tranny cooler and heavy duty lines. I'm at a loss and scratching my head. Any advice would be greatly appreciated

ok. if coolant loss is evident and you need to add water each time and not loosing it (from anywhere visible). we can tell that there is a crack on upper part of your engine . cylinder head can be broken too. so that water is entering to combustion chamber and vaporized.

Sounds like the fuel pump is going out. Replace the filter first, as it's only $10. If that doesn't fix it, then it's probably the pump, which is $250.

I think the Crank Shaft Position Sensor is bad. It will be where the transmission and engine meet together. Some vehicles are at the front, but I've changed out plenty on jeeps. The part is around $50 but it's something that takes about 5min for me to change but very easy for you to do also. It's a sensr that "knows what position your crank is in, in order for the engine to fire, the sensor read from the crank. I would try this first. Good Luck

I would try your pickup coil in your distributor. I would also be checking the o2 sensors. both of these things can cause problems like this and would not set off the check engine light.

It can possibly be the crank position sensor mounted on the top of the bell housing on the passenger side of the vehicle causing the problem. I have replaced a few of these for the same reason.

my 1996 jeep grand cherokee lmtd. won't start did tune up. cranks but no fire. please help. engine code 54 shows up . cam shaft positioning no signal. . tested all circuit. changed cam shaft positioning sensor twice.still cranks did start once ran for 5 min. changed the sensor again. no luck. help please. keith

Back up a minute...Do you have spark from the coil wire? (juice from coil) If so, change or check rotor and cap (wires do not all go bad at same time so unless they are wet, likely at least good enough to start engine)

Hi, I had simmilar problem with my 1993 JGC . I ran out of gas and it would not start until the next day. Then it will start and run until I put the brakes on tho stop and then it will die. It starts right back up. Ended up being the voltage regulator in the ECC/ECM. It is at the mechanics shop right now waiting for the ECC to come in.I will post a follow up.
have Fun,
David C