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10-16-2008, 09:09 AM
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#1 |
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Senior Member
 
Join Date: Jun 2005
Location: Winona Lake, IN
Posts: 6,450
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Broken spark plug
Anybody know what would cause the center electrode insulator to break up? I have had this problem twice now, on the number one cylinder only, and it causes a cold miss and an occasional backfire through the carb until it warms up, then is mostly smoothes out. It's an inline six. Any info/suggestions would be greatly appreciated.
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70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Sliding Rear Window Power Windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear |
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10-16-2008, 09:23 AM
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#2 |
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Registered User
Join Date: Apr 2006
Location: East Sooke B.C. Canada
Posts: 543
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Re: Broken spark plug
Inline sixes have fuel distribution problems. If the cyl is running too lean, it would detonate, and melt the electrodes, and break the the porcelain. Another cause of your problem could be too much timing.
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10-16-2008, 09:30 AM
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#3 |
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Registered User
Join Date: Apr 2004
Location: Clanton, AL
Posts: 1,253
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Re: Broken spark plug
I'd have to agree w/ the probable detonation. Definately not a good thing.
It doesn't fix the problem, but I have found that Bosch Platinums are much better against the insulator coming apart.
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10-16-2008, 09:31 AM
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#4 |
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Senior Member
Join Date: Jun 2005
Location: Winona Lake, IN
Posts: 6,450
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Re: Broken spark plug
I never hear detonation, but that is a possibility. The electrode itself does not appear to be melted, just the ceramic insulator is missing a chunk. The last time it happened was over a year ago, and I drive it every day. If it was too much timing, I would think it would happen pretty quickly?
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70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Sliding Rear Window Power Windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear |
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10-16-2008, 10:18 AM
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#5 |
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Hittin E-Z Street on Mud Tires
Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: Broken spark plug
"Made in China"?
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10-16-2008, 11:22 AM
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#6 | |
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Senior Member
Join Date: Jun 2005
Location: Winona Lake, IN
Posts: 6,450
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Re: Broken spark plug
Quote:
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70 C/10 SWB 402/TH400/3.73 "The Needy Beast" 200,000 Mile Club Disc Brake Club Owner installed options: Front Sway Bar Power Steering Power Brakes Cigar Lighter Courtesy Lights Deluxe Side Markers Wiper Delay Sliding Rear Window Power Windows Power Locks Sniper EFI 2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear |
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