1998 Jeep Laredo Looses power after about 2 minutes after s

FRANK CEPEC

MEMBER
1998 JEEP GRAND CHEROKEE LAREDO
6 CYL
4WD
AUTOMATIC
15,100 MILES

I start the car and it runs fine after 2 minutes of running the engine runs rich and acts like it wants to stall for about 10 second then runs fine again and no more problems. I shut the car off for 15 minutes and it does it all over again I have replaced the convertor and rear O2 sensor plugs cap and rotor I also tested the MAP sensor and it checks OK per the motors manual I have had this problem for 6 months, No Service Engine Soon light or codes HELP.

Thank you Frank

1 Reply

BEEF99

MEMBER
152 POSTS

If you take it to a dealer, assuming that you have not already, they will be able to narrow it down for you faster and it will cheaper for you in th elong run. From what you have described, it may be an 02 sensor even though you have already replaced one. If you bought one from certain auto parts dealers, they are known to be bad right out of the package. The reason why I say that this is your problem is that an o2 sensor can be bad but not trigger the check engine light necessarily. When you start the engine up, the loop may not close when it should and that would explain the delay between starting and then in 15 minutes, it is running ok. Also, you TPS may do the same too ad may not set your check engine light off as it starts to go bad. If your TPS is bad, you may notice that your torque converter kicks in and out sometimes. To check this you may want to get an ohm meter and wiggle the wires as they go into the sensor. Hope these ideas help.