Question about 2005 Jaguar Xjr
The pinking is due to either lean burn, high temperatures or overly advanced timing.
If the mass air sensor is dirty then it may underestimate the volume of air entering the engine and therefore call on shorter injection cycles meaning less fuel = lean mix
A faulty or slightly under-performing exhaust gas recirculation system would reduce the amount of inert exhaust gas from entering the combustion process and this will cause a high temperature lean burn situation.
An under-performing crank sensor may yield erroneous timing signals to the ECU giving rise to an excessively advanced ignition causing the pinking.
There may be error codes logged by the ECU which would help in the diagnosis.
Posted on Sep 12, 2010
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Posted on Jan 02, 2017
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