Cracked Spark Plug Insulator.

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BTW, I've had a look, but my better half accuses me of having "Boy's Looks" when it comes to searching for stuff.

My father was telling me yesterday of his problems with a Nissan Pulsar (the Oz model fitted with the 1.8L J-Car engine).

It's 286,000km.

Was sluggish, and he put in Bosch Platinum plus 4 things (against what I'd read here), and noticed a deterioration in performance...within a few weeks, it was running like a busted arsehole.

He pulled the plugs and put in NGKs, and found #4 pot had split the centre electrode ceramic 4 ways (vertically).

A few weeks later, and it's running bad, so he looks at them all, and #4 is cracked again.

A few weeks later, and it's running bad, so he looks at #4, and it's cracked again.

He DOES hear a little detonation as he moves from the lights, as he tends to lug it a tad (but I've heard far worse, including a Torana that would run for half a minute after turning it on).

He ran premium on the last plug change and it still wrecked the plug.

My two thoughts are :
* accumulated chamber deposits (that never made it to the plugs) causing detonation;
* #4 injector is losing the plot, and 4 is running hot.

I've suggested "Take two techrons and call me in the morning".

Any thoughts ?
 
Ta,
but the knocking that I've seen him induce is pretty mild compared to when I was playing games with timing and air fuel ratios.

but the detonation pic does fit the bill
 
detonation isn't caused by loose spark plug wires. Maybe one injector is lean or it could be a lot of carbon fouling.
 
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