Question about 1999 Jeep Grand Cherokee
P0306 is a #6 cylinder misfire trouble code..have seen a faulty injector on 6 cyl model,plug and/or coil on v8 models
Posted on May 17, 2009
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Posted on Jan 02, 2017
SOURCE: 1999 lexus rx300 check engine
Your 306 code means you have a misfire on cylender 6. That may be the cause of the po 125. Inspecdt the coil, spark plug wire, and spark plug on cylender 6. With the age of the car I would replace all 3 items. If you want know how to test all 3 I can tell you process of elimination is the way to do it. Do you know how to find cylender 6
Posted on Oct 15, 2010
Run standard misfire tests--pull plug, attach to wire, ground plug threads to engine and crank to observe spark. If spark is absent or weak, try a different plug/wire to narrow down to spark problem. Please see my tip at http://www.fixya.com/cars/r6715318-causes_gasoline_engine_misfires . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
If spark is good, run compression test on bank to check for bad valve/gasket.
If compression is good, suspect injector.
Please see my tip at http://www.fixya.com/cars/r6715318-causes_gasoline_engine_misfires . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
Posted on Jan 23, 2011
SOURCE: 2003 Mercedes e500 105000 miles
V8, think your right
Misfires all the way down drivers side
Not a Mercedes guy,so I guess you have
a bad ignition module effecting one side?
Posted on Feb 16, 2011
PO306 is a miss on cylinder #6. More than likely a bad plug or plug wire. But can also be a bad fuel injector or coil if this engine is a coil-on-plug design. PO306pd I have never head of. Air bag light lit normally indicates a problem with the SRS. This is a system that should only be repaired by a professional due to the hazards of working on this system.
Posted on Feb 28, 2011
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