Spark Plug Blows Out - Twice Now

[NHRef]

Hello!

First the number one spark plug blew out of my 2002 MCS (last December, just before Christmas). Yesterday the number two blew out.

The first I blamed on poor workmanship on my part, not torquing the spark plug tight enough. Lesson learned and applied. But now, I'm not so sure . . .

So why did a second spark plug blow out? And what are the odds of numbers 3 and 4 coming out as well?

I'm not the first, from what I can tell, to have this problem. Are you aware of any MINI recalls?

I am running Bosch Platinum+4 plugs.

Right now, the S is at the shop waiting for it to open on Monday. Immediate plan is to have them install a helicoil.

Maybe there's a better, long term solution . . . especially since I like to track the car (drivers' ed, not racing) a few times a year?

Thanks,

Pete

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2002 MCS R/W
BMP air filter, Alta pulley, Alta waterless intercooler cover, Borla exhaust
EBC slotted/dimpled rotors with green pads; Goodrich braided brake lines
Moss rally light bar, custom body side stripes

[Mike Edwards]

Unless the plug took the thread with it, helicoils won't help?

[Ryephile]

Well, I've seen plugs loosen due to inadequate crush-washer seating and thus improper torquing, I hate to say that's why you've had problems, but it's a possibility.

[NHRef]

The service manager at MINI of Peabody (MA USA) told me he's had at least 5 cars come in with this problem, all but one using after market plugs.

Suggested frequently checking the plugs to ensure they're at the correct torque.

[obehave]

I've run aftermarket plugs for over 2 years.
A retorque 2 weeks or so after initial install and mine have been fine.