Question about 1991 Jaguar XJ6
New plugs and wires. Fuel injectors appear fine (both electrical and fuel flow). No noticable problems. Running remarkably well on cylinders 1-4, but would rather have full use of all!
Check for spark at the cylinders you mention. Unplug the wires from the spark plugs, put a spark plug in the end of the wires, and attach the body of the plugs to earth, or an exposed metal part of the engine. With the engine running, you should have spark at the plugs. If no spark, get the ignition system tested. If there is spark present, and you think the fuel is ok, then the compression must be at fault. The things that are required for combustion are: spark, fuel, and compression. Get a compression test done on the engine, but first check for any vacuum leaks in the inlet manifold around the cyl 5 and 6 area.
Posted on Oct 26, 2008
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