bigmikecustoms

ok people this is my first 4x4 jeep had tons of cars and trucks some what tech savy i would think but this issue that i am having with my 88 jeep cherokee cheif has me stumped my jeep set up for a lil while before i got it i have done new fuel pump, fuel filter, plugs but first thing in the morn runs great perfect for a 88 get nice and warm after bout 20 miles of driving when i go to get in the gas like off the red light it bogs almost dies on me like it either getting to much fuel or not enuff so i thought i would come to the experts before i start throwing parts at it by the way when it does this bog shutter problem you can pull over and put it in park and rev the motor and no bog or shutter i am stumped jeep gods of this forum please help this is my everyday driver of me and my 3year old daughter thanks guys

VTJeep

o2 sensor/s. i had a similar issue where under normal driving, it would buck, and hesitate and feel like it was going to cut out.. there was a popping like a backfire from the manifold area. when you mashed the gas, or at least got it into high idle, the problem would go away. i thought it was the TPS or IAC, then i thought it was the plugs, wires, cap, rotor... so it all got replaced. the only things left were the coil and o2 sensors... and guess what it was... 2 of those 4 wire, heated o2 sensors aint cheap for a 99 xj, $100+/ea. but i went from a whopping 11 mpg to an acceptable 17.5 mpg. running some wrangler dura tracs doesnt help, but they are only 235/57r15's... good luck man!

bigmikecustoms

thank you brother i was bout to start throwin part but i will start there yea yea time to go to the parts store thanks other ideas for anything else or warnings always taken

VTJeep

one more thought... make sure to get it on a code reader to see if it has stored anything in there. sometimes it will register that something is off, but not trip a code.

DaddyCat

you said it had been "set up for lil while" is it possible it has old gas that has gone bad? maybe water in the tank?

bigmikecustoms

yea drained the tank when i did the fuel pump and have run 4 or 5 tanks through it sense

DaddyCat

so it seems to be heat related, electrical/electronic components can become weak with age and heat. Spark plug wires, coil, distributor cap, TPS.
Look here for info on your Renix engine and it's sensors, might wanna test your TPS:
http://www.lunghd.com/Tech_Articles/...iagnostics.htm

VTJeep

the 88 has a CPS (crank position sensor) i think. this could be it as well...

bigmikecustoms

man thanks for that page of info bro very helpful for everything i might be having a prob with much thanks for passing that on to me

DaddyCat

you are welcome, good luck with it!