My '95 XJ 4.0L is buckin' and spittin' like a bronco. Just replaced distributor because it was whining, also replaced the cap and rotor. Now it's misfiring real bad. Local mechanic has pulled the dist several times and checked TDC, everything is timed right according to him. TDC timing mark on balancer is lined up with piston 1 at top dead center, rotor is hitting spark plug 1. Everything seems to be timed right, mechanic has tried to reset the computer to get it back to base, nothing seems to work and he can't figure it out.

 

I would have said to check the firing order but that has probably already been done.
Make sure all of the spark plugs and the wires at the cap have a good connection, make sure they click when you put them on

 

I would like to know the same thing. I did a tune up too and I am having the same problem. How do you reset the computer. Everyone that I talk to says different things.

 

haha i thought i was the only one. but my jeeps doing the same thing i just replaced all the wired plugs rotor and cap. it misfired for a little while and now it won't start at all =[

 

Hey guys all i had to do was re gap a couple of my spark plugs. when i put them in i must've messed em up or something but idk if it helps thats what fixed my problem.

 

Firing order check and gap check is where I would start.

 

wow i have the same problem engine would not start replaced dist,cap,rotor,plugs,wires,coil,crank sensor
i have done and redone the timing and it starts but no spark to cyl 4,5,6????? help!!! i think it might be a bad dist going to go swap it again at advance auto

 

My brother's 98 is doing the same thing. Did a complete tune up, fixed it for approx. 300 mi. took the cap back off and the electrodes were already rusted put on a new cap and rotor and still doing it. going to check gaps this weekend. i'll let you know if that took care of it. Really looking forward to finding the answer

 

Did any of you guys check to see if you had any trouble codes? Maybe one for O2 sensor I think it's PO132, if you do and you change out the O2 Sensor you will most likey fix your problem. The O2 sinces the amount of Oxygen in the exhuast and the PCM uses this info to change the fuel at the injector and the air flow at the TB. Sometimes you can idle perfact and then 15 minutes down the road you will start with hesitation and then rought idle and so on.

 

i took my valve cover off an took a sraper an shop vac to the valves it helped alot