Question about 1996 Jeep Grand Cherokee
Car is running extremely rough when not in motion (check engine light is active). Diagnostic tool @ Autozone said I had a "random cylinder misfires detected" error and a specific cylinder misfire error (cylinder 6). Most probable cause is spark plugs. I had a full tune-up last April (2008) and my assumption (see what that gets me) is that they changed the spark plugs. If yes, I doubt that they would go bad after a year. Does this model year require a specific spark plug type (can't find it in the owner's manual)? Any other helpful tips would be greatly beneficial! Thanks.
P0300 Code - Random Misfire
Symptoms Symptoms may include:
Posted on Mar 05, 2009
97 Intrepid -- the check engine light came on & it ran rough enough to make you sick to your stomach. Code said problem w/ #5 cyllinder. We had the manifold gasket replaced (it crumbled to bits) & voila problem fixed.
Posted on Jan 23, 2012
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2004 Marauder and 2003-2004 Mustang vehicles built before 12/19/2004 equipped with 4.6L 4V/5.4 4V engine may exhibit a runs rough, lacks power, and engine misfire, prompted by a MIL light and DTC codes P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, and P0316.
Diagnose engine for engine misfire concern. If diagnostics determine an engine misfire which is characterized by leakage through exhaust valve(s), only replace the affected cylinder head(s).
SERVICE PROCEDURE FOR VEHICLES WITH RUNS ROUGH/MISFIRE CONDITION:
1. Perform relative compression check on all cylinders. If abnormal, check cylinder leakage and actual compression for "low" cylinders refer to Workshop Manual (WSM), Section 303-00.
2. If leakage/compression check indicates a valve train concern, per valve train diagnostics in WSM, Section 303-00, replace cylinder head and cam assembly, pipe plugs and timing chain tensioner, per procedure outlined in WSM, Section 303-01.
3. If cylinder leakage and compression tests are inconclusive, perform misfire diagnostic, per TSB 05-22-8.
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