I know that this has been covered here before, but I need to dig a little deeper than has been discussed. I have an '01 TJ / 2.5L. I just installed a new rebuilt engine and am having some timing issues. I know that the service manual and member on here swear that you cannot adjust the timing, but I am not satisfied with that answer.
I have found that I can adjust the timing by putting the harmonic balancer at TDC "0" with the rotor facing the #1 plug on the distributer cap. In doing this you can either advance the timing or retard it by unbolting the distributer, pulling it out and turning the adjustment screw on the top of the oil pump. The3n when you put it back in the rotor will be moved to the new spot.
Now...with #1 at TDC and the HB at 0 on the timing reference guage my engine runs like poo. When I adjust the distributer as mentioned above it does get better. Although, there is a slight vergence in the force at times when I rev the engine. Is there a trick or technique to turning the distibuter only 1 tooth at a time, or is it all trial and error.
Also, with everything aligned the timing light at idle says that I am at about +8 TDC. This seems a little much since both the rotor, HB and #1 are where they need to be or so it seems.
I also hooked up my OBDII reader and it says that the "spark advance" is at 17.
Thanks to anyone that can explain this and help me out.