What causes a 1990 Jeep Cherokee Laredo to turn over but at times not start you've changed the computer ignition switch battery and cables and also the ignition control module?

it sounds like you should have a eletrical spark coming out of your coil ckeck there first, on the two cherrokees I have own it was the fuel system, pluged filter,weak fuel pump made starting intermitant if your 1990 Jeep is carberated try a table spoon of gas in the carb. be very carful not to spill gas all over it will burn if there is a back fire thru the carb.good luck P.S.please be very careful!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

AnswerYour problem may exist in the ignition switch whereas the trigger may not be resting properly on its contact position. Try manipulating the switch back and forth to see if it will engage. I've had this problem several times, started to replace the switch, but worked it until the jeep cranked.

ANSWER

On mine, WE tried the ignition switch and changed the fuel filter/pump. Ended up being the fuel relay switch. (7 hours of labor at the dealer later)