Car had prior misfire, possible causes of some oil leaking from valve covers,old plugs,leaking breather hose so recently change all plugs with oe plugs,hose that goes to brake booster,all oil seals on valve covers,breather hose for pcv,and imt tuning valve o rings, car ran fine the two weeks now showing these misfires i rechecked for intake leaks with carb cleaner but everything seems fine, im out of ideas
The fault codes you have are all misfire codes p1313 and p1314 are manufactuer codes only. but they all point to same issue check the engine wiring harness under the air box for chaffing also the on plug coils are very unreliable the spark plug internal resistance is critical use only genuine plugs we had to change all 6 because pattern plugs had been fitted and check for water ingress in to the ecm/connector that may be the problem
SOURCE: 2003 x type engine light
Please email me what items has been change / swapped in last 30 days.
Did you get a tune up lately.
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Is the Jag able to start up in on crank?
All sign is pointing to a miss-alignment or failing crank position sensor.
Check the CPS on the engine (near transmission housing) for loose mounting and bad / corroded connection.
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All these miss firing can be sign of loose wire or WET ignition wire in the morning.
p0300 p0301 p0302 p0306
Inspect all plugs and wirings to rule out connection problem.
Wipe dry all wires and connectors before road test the car.
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Use IR non-contact tester to inspect the temperature before and after the catalytic.
The exit temperature should be 5-20F higher then the entry inlet on both banks.
Please keep me up to date on the fix via email.
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