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#1
01-23-2012, 08:34 PM
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Need a plug reading
This coming Sunday I've got a private track rental to go to so I figured I would do some basics before hand. Changed the oil/filter, fuel filter, and new plugs even though the ones I took out were only like 2 months old and had 2 bottles on them. Anyway I pulled number 8 out and found this. Now mind you the motor has almost 150k on it and a 100k worth the spray. I know the the motor is tired but to me it looks like it could be sooner than later that I will have serious issues by looking at this plug. Also there was oil on the threads. Maybe Don could chime in on this one.
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2000 SS Th350, FTI 4200 stall , cam, full bolt-ons, 150 wetshot, Moser 9inch/locker/4.11s, Slowhawk tuned. 493rwhp 570rwtq. 10.97 @ 127.7 1.58 60' and M6 10.84 @ 126.3 1.55 60' Th350 SOLD BUT NOT FORGOTTEN New Toy - 06 Torrid Red Gto M6. 231/242 cam, Kooks, magnaflow, GForce, Monster stg2, lingenfelter cai, 411rwhp 385rwtq. 12.40@111 
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#2
01-23-2012, 09:08 PM
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looks like ash to me
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 1999 Z28 T-Top M6 - LS6, Bolt Ons, Suspension, MWC Narrowed 9" - 415rwhp 385rwtq 10.847 @ 125.17 1989 IROC-Z H/T M5 2006 F350 SCSB 4x4 6.0L Diesel - Studs, EGR Delete, Powermax Turbo, Extreme Tuning & Exhaust - 13.23 @ 101
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#3
01-23-2012, 09:41 PM
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 Ash - lean on fuel in that cylinder from nitrous? says caused from fuel additives. do you add anything?
__________________
 1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore.  BAAAAAA!!!!!!
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#4
01-23-2012, 10:16 PM
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No don't add anything. Wondering if its from the oil adadditives? there was oil on the threads. But I did install new valve seals when I changed the cam last year.
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2000 SS Th350, FTI 4200 stall , cam, full bolt-ons, 150 wetshot, Moser 9inch/locker/4.11s, Slowhawk tuned. 493rwhp 570rwtq. 10.97 @ 127.7 1.58 60' and M6 10.84 @ 126.3 1.55 60' Th350 SOLD BUT NOT FORGOTTEN New Toy - 06 Torrid Red Gto M6. 231/242 cam, Kooks, magnaflow, GForce, Monster stg2, lingenfelter cai, 411rwhp 385rwtq. 12.40@111
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#5
01-23-2012, 11:16 PM
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I had a plug that had some ash on it like that, and probably not coincidentally I think my car has bad valve seals. The electrode was not white like yours however, which would suggest excessive heat or running lean. I assume it's a colder heat range plug for the spray? If you just did valve seals and there's still evidence of oil it might be worth doing a compression check just to rule it out, although you might be down compression anyways from the life that motor has had.
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#6
01-24-2012, 12:17 AM
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Oh I can almost be sure that the motor is down on compression and the rings are gettting worn.
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2000 SS Th350, FTI 4200 stall , cam, full bolt-ons, 150 wetshot, Moser 9inch/locker/4.11s, Slowhawk tuned. 493rwhp 570rwtq. 10.97 @ 127.7 1.58 60' and M6 10.84 @ 126.3 1.55 60' Th350 SOLD BUT NOT FORGOTTEN New Toy - 06 Torrid Red Gto M6. 231/242 cam, Kooks, magnaflow, GForce, Monster stg2, lingenfelter cai, 411rwhp 385rwtq. 12.40@111
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#7
01-24-2012, 12:35 AM
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Back cylander isn't getting enough fuel common on nozzle systems just be careful or jet up a tiny bit more fuel
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 2000 SS Procharger 98 Z vert turbo 07 TB SS cai catback and tune
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#8
01-24-2012, 02:48 AM
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oil burning can also cause detonation at high rpm. food for thought.
__________________
1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. BAAAAAA!!!!!!
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