Question about 1989 Jaguar XJ6
Hi as you know this could be numerous things, i have had a look in my auto data information and what i have come up with is a couple of things you might need to try, air leaks,on air intake system and vacuum system what you can do is purchase a can of easy start, and run engine, on idle just go around the air pipes and vents to see if there is a leak, the engine will idle faster if found, also the fuel pressure delivery regulator, this will need to be checked obviously if you are not getting enough fuel or too much fuel this will cause hesitation with the vehicle..hope this helps
Posted on May 31, 2010
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Posted on Jan 02, 2017
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A code P0300 may mean that one or more of the following has happened:
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders ( spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open
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