Question about 1996 Jeep Cherokee
Is the problem only on a cold engine, hot or both?
is the hot engine reaching and holding 180F or more as it must?>
its running rich
and that is misfire.
lots of causes for rich. the tests are easy in shop with tools.
or the 02 lies. , goes to 0volts and then engine runs rich as a piggy. (my scan tool shows this is seconds, 02 flat-lined at 0v.
all cars, with 02 do that. with that issue.
02 means oxygen sensor, the front one, not the rear one.
Posted on Dec 11, 2016
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Posted on Jan 02, 2017
what codes are present? If it is lean codes P0171/P0174 problem is most likely the orings leaking between upper and lower intake manifold if this is a 4.0L
Posted on Feb 11, 2009
Perform a valve clearance inspection and adjust if necessary. Tight or sticking valves will cause a misfire or rough running concern. Note: Perform valve adjustment when the engine is stone cold. 4cyl: INT 0.26mm EXH: 0.30mm (V6 engine are hydraulic and no adjust necessary.) Also check for a sticking or stuck open EGR valve. For diagnostic purposes only: Remove the EGR valve. Place a business card over the EGR passage and bolt the EGR valve back on. This plugs the EGR ports and if the misfire goes away the EGR valve is partially stuck open and is defective.
Check for low fuel pressure. Check for low compression. Check cam timing. Check for a weak ignition coil. Also don't over look the possibility of worn or broken engine mounts which cause excessive engine movement and engine vibration. -hope this helps
Posted on Mar 05, 2010
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