Hello, I am Jesse!
I am new to the forum. I found what seems to be an amazing deal on a 1998 jeep grand cherokee Laredo 4.0l. I found this really clean rust free ZJ up for sale for $600 it needed door pins and the engine was randomly stalling at stop lights. I bought it to repair hoping that it will be an easy fix and if not I can still get most of my money back so it is worth the gamble. So I bought it and drove it home on a 45 minute drive and it ran and drove perfectly, actually it was one of the smoothest vehicles I have ever driven. the next time I drove it about 5 hours later It started doing the stalling at stop sign thing. At stop signs it will shutter at low RPMs and then stall at really low RPMS. If you keep your foot on the gas and keep the RPMs above 1000 it runs fine. I have done some research and people that have had similar problems say it could be any of the following:
IAC
TPS
Crank Position Sensor
fuel pump/filters
vacuum leaks
distributor cap,rotor and wires
PCM
PCM bolts
Torque converter/torque converter clutch
Transmission solenoids/ Speed Sensor
So far I have replaced the Idle Air Control valve and the Throttle Position Sensor. I have checked some lines and fixed some possible vacuum leaks. I want to know if anyone has had a similar issue and knows what could be the most likely solution. Before this zj I had a v8 and it had the same issue with a different engine and I changed multiple sensors and never got rid of the issue before I got rid of it. The odd thing is that in park the jeep will run well. Sometimes in park the rpms will increase and sometimes it sounds like it will miss but it will never stall. Sometimes (rarely) the jeep just runs great, no stalling or anything. I have to think the engine isnt crap because it runs well over 1000 rpms and whenever it doesnt feel like stalling. Please someone help me before I spend too much money fixing this issue which will ultimately make this a bad deal.
I am new to the forum. I found what seems to be an amazing deal on a 1998 jeep grand cherokee Laredo 4.0l. I found this really clean rust free ZJ up for sale for $600 it needed door pins and the engine was randomly stalling at stop lights. I bought it to repair hoping that it will be an easy fix and if not I can still get most of my money back so it is worth the gamble. So I bought it and drove it home on a 45 minute drive and it ran and drove perfectly, actually it was one of the smoothest vehicles I have ever driven. the next time I drove it about 5 hours later It started doing the stalling at stop sign thing. At stop signs it will shutter at low RPMs and then stall at really low RPMS. If you keep your foot on the gas and keep the RPMs above 1000 it runs fine. I have done some research and people that have had similar problems say it could be any of the following:
IAC
TPS
Crank Position Sensor
fuel pump/filters
vacuum leaks
distributor cap,rotor and wires
PCM
PCM bolts
Torque converter/torque converter clutch
Transmission solenoids/ Speed Sensor
So far I have replaced the Idle Air Control valve and the Throttle Position Sensor. I have checked some lines and fixed some possible vacuum leaks. I want to know if anyone has had a similar issue and knows what could be the most likely solution. Before this zj I had a v8 and it had the same issue with a different engine and I changed multiple sensors and never got rid of the issue before I got rid of it. The odd thing is that in park the jeep will run well. Sometimes in park the rpms will increase and sometimes it sounds like it will miss but it will never stall. Sometimes (rarely) the jeep just runs great, no stalling or anything. I have to think the engine isnt crap because it runs well over 1000 rpms and whenever it doesnt feel like stalling. Please someone help me before I spend too much money fixing this issue which will ultimately make this a bad deal.