Put this question up before,misfire on all left hand bank,i have had new plugs,coil packs checked,inlet manifold gaskets fitted upper & lower,both breather elbows,but still had misfire.Auto the EXPERT! said it was timing chain,so had both chains,tensioners & guides fitted,Guess what still misfire.no fault codes showing runs fine exept on idle thats when its misfiring.Any ideas ?
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coil 3 on early engines it is under the inlet manifold you have to remove it. you should also change all 3 plugs whilst manifold off the plugs can cause coil failure.we at the dealer I worked for changed all 6plugs and coils on jaguars advise, my advise change coils and plugs under manifold only the other 3 are easy access
Hard to diagnose your problem from my laptop but if it shakes in the morning I would asume a cylinder or two are misfiring. I would pull the plugs out and see what the engine is doing. Not an easy task as the manifolds have to come off to get three of the plugs out. Also do you have the check engine light on? If so the codes will tell you what, if any, cylinders are misfiring. Possible lazy coil packs ( one for each plug ), worn out plugs, etc.
If you look stright forward at the front of your car when youlift the
bonnett the left bank of plugs are under the inlet manifold and the
right set are under the Jaguar name plate, this cover on the right
lifts of and reveals the coil packs the plugs are under the coil packs,
you have too take the inlet manifold of to replace the left bank.
Get your local garage to put a scanner on the car. The early s-type used to suffer from ignition coil faults. If a fault has been hinted towards a specific coil then swap to a different cylinder and see if the fault follows wich will indicate a coil fault.
Has the vehicle had its spark plugs changed? every 70.000 miles as they tend to fail if left unchanged. Intake manifold requires removing to replace bank 1 plugs.
Also check the small rubber elbow on the end of the plastic beather pipe wich runs throught the intake manifold branches. Elbow is located at the rear of the engine
The normal cause of bad idling on these engines is either air leaks on the top hoses or/and around the inlet manifold. Also sometimes either the throttle body or faulty coil/plug pack.
hope this helps.