Hello im a newbie, and love this site!, I have a 97 grand Cherokee larado with the inline 4.0,.my problem is im in the smokey mountains of tennesse,and its about 25degrees outside.ill let the jeep sit for 2-3 days and it will start right up,and I let it warm up ,go to work (about 11 miles) and after my shift 8hrs later,it starts,but stalls out 2-4 times until I get her warmed up. its frustrating and when you kick on defrost before shes warmed up it also dies ,...any ideas??? ive replaced numerous parts,and have had my jeep for about 2yrs.looking forward to talking with you good people,.. thanks!

 

What parts have you replaced and when?

 

Hello rooch1008, well let see all with in yhe last yr, crank pos sensor,cam sensor,idle air cntrl sensor,coolant sensor,throttle body rebuilt with new tps,new cat converter,new muffler,distributor,cap rotor,plugs wires,just to name a few along with shocks,tires sway bars bushings,rebuilt rear end 5k ago,brakes new aqnd cailipers,and little stuff here and there,thanks for your help!

 

Update; also for an exsample; tonight when I was leaveing work I started the jeep 7 times stall start stall start, when she got warmed up no problems all the way home.i also during the stall issue I plugged in my scanner,... NO Codes, and did live data while running before I drove home,No Problems, im stumped, Ideas?? I know im going to need a battery because its only a 600cca, I think I need at least a 800cca thanks for your help,...

 

Kind of wierd that after sitting for 2 or 3 days it doesnt seem to happen...i would try cleaning the IAC SENSOR ....does the 4.0 have a Intake Air Temperature sensor?

 

Yes it does and you can check it with your scanner while it's running. It's only a variable resistor and is mounted in the intake runner to #1 cylinder just ahead of the throttle body.

With the engine up to temp, mine reads about 155* with the outside air temp around 65*. You can also "ohm" it out. At 32*F, it should be reading around 33,000 ohms, lower at higher temps, higher at lower temps.