Spark plug snapped - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-21-2010, 08:50 PM   #11
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Default Crisis mode off.

A little lube, a little more careful ratcheting, and the rest of the plug came out. The plug had actually snapped in half; the porcelain snapped at the top of the metal. Turns out either myself or my friend overtightened them, as the topmost two threads were completely mashed.

Fortunately, I didn't throw away my old plugs (as they turned out to be long-life platinums with at least 10,000 miles left in them). I grabbed one and plugged the hole.

She'* still running a bit rough, but with five copper plugs, one platinum plug, and worn-out wires, I suppose I couldn't ask for more. Obviously looking at doing a full tune-up and oil change this weekend.
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Old 06-21-2010, 08:52 PM   #12
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ouch, I wouldn't drive like that. Sounds like asking for a chipped piston or something along those lines.
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Old 06-21-2010, 09:00 PM   #13
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Really? Yikes.

What would cause a piston to chip? The fact that one spark plug may be stronger or weaker than the others?
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Old 06-21-2010, 09:02 PM   #14
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If the car is running rough, possibly misfiring, I would not think it a good idea to be driving it. Especially since spark plugs can be purchased almost anywhere fairly cheaply. Why take the chance?
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Old 06-21-2010, 09:11 PM   #15
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Lets talk overall torque...15LBS no more!! (with anti-seeze) you should be fine..3/8" torque wrenches were made for drainplugs and spark plugs...Yet, before I used a 3/8" torque wrench on spark plugs, on a L36 I snapped spark plug torqueing it...best of luck getting the old plug out....a machine shop should be able to get the old plug out...
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Old 06-21-2010, 09:11 PM   #16
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Good point. My paychecks are sporadic, so that'* why there aren't new plugs and wires under my hood right now.

I can catch a ride to work tomorrow, but if I need to take my car in an emergency (i.e., not a beer run), would it be safer for the piston if I unplug cylinder 3'* spark and fuel injector wires again?
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Old 06-21-2010, 09:12 PM   #17
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Chipped piston.

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This comes from predetonation. The odd plug is bad news on a supercharged engine. Autolite copper plugs are about $1.50 each.
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Old 06-21-2010, 09:15 PM   #18
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Originally Posted by SignOfZeta View Post
Good point. My paychecks are sporadic, so that'* why there aren't new plugs and wires under my hood right now.

I can catch a ride to work tomorrow, but if I need to take my car in an emergency (i.e., not a beer run), would it be safer for the piston if I unplug cylinder 3'* spark and fuel injector wires again?

If you drive normal, you should be OK, just stay off the gas. nice and easy.

As for torquing plugs. I have never used a torque wrench on spark plugs. Antisieze, turn in by hand, then 1/16th of a turn, that'* 1/16th turn. Just enough to compress the seal.
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Old 06-21-2010, 09:19 PM   #19
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Quote:
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If you drive normal, you should be OK, just stay off the gas. nice and easy.

As for torquing plugs. I have never used a torque wrench on spark plugs. Antisieze, turn in by hand, then 1/16th of a turn, that'* 1/16th turn. Just enough to compress the seal.
I have become a fan of torqueing everything due to my boss who needs everything to be torqued to OE spec.
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Old 06-22-2010, 07:34 AM   #20
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Congrats on getting the plug out.

Did you happen to get a picture of the remnants? I'm interested on how the tip looked, mashed, beated or hit?
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