Pinging on 91 fixed by E10 94
I recently noticed my XJ was pinging (pre-detonation) quite badly
Spark plugs are recommended Champion 12RYC, about 4yrs old but only about 40k, they are whitish and the ground electrode is eroded out to about .060" from stock .035"
I change them and pinging is reduced, but still present
Italian tuneup further reduces pinging, but it is not altogether gone,
most folk would not notice, but I know burned piston is a thing on XJs
I have always used 91 which is stated ok in Handbook, as is E10
I decide to fill with E10 (94), as it is cheap on that day
Pinging is gone
Continue to use E10, no more pinging
(was previously present under high throttle & load situations only)
I have not tried it on 95, but probably will, just to see
With E10 @ $1.75, and 95 @ $2.15, I will be just using E10 in future
(in theory, if an engine is deemed suitable for 91 Octane, increasing octane content should give no better power or economy)
Pre-detonation is unequivocally bad for an engine
Has anyone else experienced pinging on '91 ?
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'96 4.0 Sport 375k+
'96 Limited 263k (unreg spare)
'96 Sport 335k (got smashed, farmtruck)
Last edited by awg; 28-12-2023 at 04:19 PM.
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