hi guys, newbie here with a question, i have a grand cherokee 1993 and recently got flooded badly. water in oil, etc. oil was changed, transmission oil was also changed. ran good for a couple of days and suddenly runs vague in drive gear...i have to start in first gear and switch all the way up to drive...is there any relay that might be damaged, computer etc...

Thanx guys.

 

if you can start it in first gear then you need to clean your neutral safety switch.

that might be part of your problem.

 

i can start my cherokee in parking and i can use all gears but when it comes to ridin i have to switch to 1st gear instead of drive gear and then shift all the way to d....do you still think that i need to repair the neutral switch??

 

what happens when you try to go when in drive? you don't move? it doesnt shift right?

 

exactly, it moves in all gears but d...

 

If you did not drive after the flooding, then try flush the transmition, but if you drove then you my have water in torque converter and clutches are slipping. Try flash again and see what happen.

 

i'll try all and come back with answers, or more questions. i appreciate everyone's time to answer my questions...thanx guys!!

 

transmission computer is fried!!!thanks for all your help...

 

what happens in D, does it start in 4th? then check the TCU harness connectors and the tranny fuse. Symptoms are as if the TCU was disconnected.

 

ah sorry didn't read the last post, but i was there... lol

 

Its the most common damaged part after a vehicle has been affected by flood...

 

bought an used computer for 60 bucks!!!problem fixed!!! thank you all for your great support.

 

Where is the TCU located?

 

is located in the drives side under the steering wheel...two screws do go out thru the fire wall behind the brake pump...