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cracked plugs with less then 1,000 miles

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Mater

Post subject: cracked plugs with less then 1,000 miles

Posted: Sat Jun 11, 2011 5:33 pm

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WTF

what would couse a plug to crack in less then 1,000 miles? this may explain the missfire and poor fuel econmy the car had but they where brand new AC delco dirrect replacements?

going to just get autolites int he factory heat range copper cores but this makes me a bit PO'd becuasr they where not cheap being platnum tippped....

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z3r0

Post subject: Re: cracked plugs with less then 1,000 miles

Posted: Sat Jun 11, 2011 6:52 pm

The Man in Black

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iirc the s/c hates the plat plugs even causing blowouts and misfires w/ anything over copper plugs

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bigdog9191999

Post subject: Re: cracked plugs with less then 1,000 miles

Posted: Sat Jun 11, 2011 7:26 pm

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My guess is un less you pulled.them before you pulled the manifolds off that they got.bumped. I have done it and thought I didn't. The factory plug configuration platinum or other wise would not have been used if they where that bad.

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Mater

Post subject: Re: cracked plugs with less then 1,000 miles

Posted: Sat Jun 11, 2011 7:49 pm

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probably did but it was missfiring befire i messed witht eh manifolds that's why i toor it down to begin with

also i bought the plugs when i thought i was going to leave it stock for a wile i had no need to go into the engine

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
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Don_Rome

Post subject: Re: cracked plugs with less then 1,000 miles

Posted: Sat Jun 11, 2011 11:20 pm

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It's probably just a defective plug. The porcelain could have cracked when it was put together.

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Mater

Post subject: Re: cracked plugs with less then 1,000 miles

Posted: Sun Jun 12, 2011 12:02 am

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but all 6?

looking at them i think i might have hit them witht he manifold it's a strange cracking though

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

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z3r0

Post subject: Re: cracked plugs with less then 1,000 miles

Posted: Sun Jun 12, 2011 8:52 am

The Man in Black

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pics?

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Mater

Post subject: Re: cracked plugs with less then 1,000 miles

Posted: Sun Jun 12, 2011 4:26 pm

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shure

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slow6

Post subject: Re: cracked plugs with less then 1,000 miles

Posted: Sun Jul 03, 2011 10:59 pm

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If the porcelain is cracked it's possible you over tightened. It typically happens with #6

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Mater

Post subject: Re: cracked plugs with less then 1,000 miles

Posted: Tue Jul 05, 2011 2:05 pm

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na i figured it out i dropped the manifold when i was taking it off and i am pretty sure that when it happend

i got soem copper core pugs for it AL104s

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