Spark plug #6 arching to block
12-28-2016, 11:34 PM
#1
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Car: 1992 Z28 Convertible
Engine: LB9 - seeking sped density L98
Transmission: 700r4, have a t5 I am swapping
Axle/Gears: G92 3.23 third gen Borg warner
Spark plug #6 arching to block
So changed headers a year ago but haven't really used the car much since... at the time I bought a set of inexpensive wires for the 90 degree boots. After a new 5 spd swap to my 5.0 1992 TPI z28 and then a new rear end, I took the car out for a weekend that ran great. Then this week a misfire occurred lightly, then dramatically over the week. I only changed a couple of wires and left some old. I tried changing back to the old wires but same issue. With the lights out it appears to only Arch to the block at #6 cyl.
could it just be wires? Tune up? The t5 swap? Or blown cylinder?
could it just be wires? Tune up? The t5 swap? Or blown cylinder?
12-28-2016, 11:36 PM
#2
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Car: 1992 Z28 Convertible
Engine: LB9 - seeking sped density L98
Transmission: 700r4, have a t5 I am swapping
Axle/Gears: G92 3.23 third gen Borg warner
Re: Spark plug #6 arching to block
Still running the automatic 7004r chip on the 5.0 for fyi
12-29-2016, 06:57 AM
#3
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Spark plug #6 arching to block
Cracked spark plug, If wires are good.
12-29-2016, 04:13 PM
#4
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Re: Spark plug #6 arching to block
Here's a nice example of a plug that was arcing for a while.
Side 1:
Side 2:
If the plug had less miles on it, it might not have been as obvious. It didn't show on the engine scope either. Misfire eventually got worse as the mileage accumulated to where I actually felt something was wrong. This eventually killed my catalytic converter.
Side 1:
Side 2:
If the plug had less miles on it, it might not have been as obvious. It didn't show on the engine scope either. Misfire eventually got worse as the mileage accumulated to where I actually felt something was wrong. This eventually killed my catalytic converter.
12-29-2016, 04:44 PM
#5
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Join Date: Oct 2013
Location: Home of the world champion San Antonio Spurs. 210 baby!!!
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Car: 1992 Z28 Convertible
Engine: LB9 - seeking sped density L98
Transmission: 700r4, have a t5 I am swapping
Axle/Gears: G92 3.23 third gen Borg warner
Re: Spark plug #6 arching to block
Thank you each for the responses. I think it's time for a tune up anyway so best to knock it all out