How to adjust the valves on a 1998 5.2 Jeep Grand Cherokee .

still bad. still guessing?

check to see if you have a steering damper (shock absorber) that is restricting steering. wrong one installed

Check the fuel pressure. Low fuel pressure will cause a lean condition.

there is no way to adjust the idle on a computer controlled car. If your having an idle issue most likely the injectors are clogged or the Idle air control valve is bad. Try cleaning the throttle body around the throttle plate. If this doesnt help and you have no codes present I would get a data scanner to make sure the throttle position sensor is giving the correct data or test it with a meter. At idle it should be about 1 volt on the center wire. Some are adjustable. If all this checks out then replace the IAC

You will probably find what you are looking for here:
1998 Jeep Grand Cherokee Service Manual
http://rapidshare.com/files/138412864/ServiceManual.Jeep.Grand.Cherokee.1998_by_Parasico.rar
otherwise i still recommend downloading this for reference...

Goold Luck!

HALLO

THEY RE NOT ADJUSTABLE, BECOUSE THEY RE HYDRAULIC
MARKO

Remove the valve covers. Inspect each rocker arm for wear, cracks or other damage, check the rocker arm abd dykcrum for wear, replace with new ones, they can"t be adjusted.

shift select switch-faulty or out of adjustment.

its your valve lash thats clicking. make an oil change and put some oil treatment. if it still exist, adjust your valve lash.

Sounds like a loose belt, Depending on what engine etc., it may need to be changed or if you have adjustment, tightened. When adjustment or replacement done, is a good time to check all pulleys. If your not up to it, an adjustment should not cost too much, few minutes work in most cases, if belt needs changing, price of belt & a little more labor involved.