milehigh
NAXJA Forum User
- Location
- Denver, CO
hi there, first off im new to this forum and new to jeeps. ive had my 2000 cherokee for about a year now and absolutely love it, its ustoppable in the snow, and has just enough power for here in the rocky mountains. it has 111k miles on it.
ok so here goes about 2-3 months ago i noticed that the milage has dropped from about 21-22 on the highway to about 18-19mpg. around town until recently has stayed around 18-19. about 2 weeks ago i put a set of BFG ATs on there, 28's i think? odometer isnt off by more than a 10th. i did go with a 8 inch rim though. which means i put a 1.5 inch lift kit on the back and 1" in the front, couldnt find 1.5 spacers for the front for some reason. now the milage is about 16 highway and city. im still messing with air press on the tires to confirm that its the tires/lift that caused that drop and not whatever was causing my milage to decrease initially
so back to that issue, i am more of an old school guy with cars, being able to tune a carb, tweak a dizzy, ignition checks, etc. this cherokee is all electronic and there is nothing according to my haynes that i can check or tune. so i am at a bit of a lose to diagnose this problem. also there is no check engine light on.
To date this is what has been done or what ive observed about it. I replaced the plugs with a set of platiniums i belive, when i got it about a year ago. it does seem to idle a little rough according to the tach at idle, but has been this way since i bought it when the milage was good. air filter has been changed a few months ago. the stock muffler looks to be rotting out, i plan on replacing that soon with probly a hooker aero chamber, heard that they have excellent flow, which is what these jeeps seem to need on the exhaust and intake. also i dont know if the previous owner replaced the O2 sensors and emissions timer at 82k like the manual recomends. any help or insight is greatly appreciated, and sorry for the long post. figured best to give too much info than not enough. thanks in advance!
ok so here goes about 2-3 months ago i noticed that the milage has dropped from about 21-22 on the highway to about 18-19mpg. around town until recently has stayed around 18-19. about 2 weeks ago i put a set of BFG ATs on there, 28's i think? odometer isnt off by more than a 10th. i did go with a 8 inch rim though. which means i put a 1.5 inch lift kit on the back and 1" in the front, couldnt find 1.5 spacers for the front for some reason. now the milage is about 16 highway and city. im still messing with air press on the tires to confirm that its the tires/lift that caused that drop and not whatever was causing my milage to decrease initially
so back to that issue, i am more of an old school guy with cars, being able to tune a carb, tweak a dizzy, ignition checks, etc. this cherokee is all electronic and there is nothing according to my haynes that i can check or tune. so i am at a bit of a lose to diagnose this problem. also there is no check engine light on.
To date this is what has been done or what ive observed about it. I replaced the plugs with a set of platiniums i belive, when i got it about a year ago. it does seem to idle a little rough according to the tach at idle, but has been this way since i bought it when the milage was good. air filter has been changed a few months ago. the stock muffler looks to be rotting out, i plan on replacing that soon with probly a hooker aero chamber, heard that they have excellent flow, which is what these jeeps seem to need on the exhaust and intake. also i dont know if the previous owner replaced the O2 sensors and emissions timer at 82k like the manual recomends. any help or insight is greatly appreciated, and sorry for the long post. figured best to give too much info than not enough. thanks in advance!