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10-13-2012, 07:45 AM
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#1
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DC Crew
Posts: 42
Member #116949
Member since: Jun 2011
Location: Billings/MT/USA
My Corvette(s)
2002 coupe
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Spark plug help
OK guys, I know this is stupid but man o man has this got me confused. I want to change the plugs in my C5 as I'm at 100 thousand miles and don't know when or if they have ever been changed. I took one out and it really doesn't look all that bad but here's the problem.
My shop manual says plugs are AC PTJ16R15. Checking at the local parts store the guy says they should be AC 41-110. AC/Delco website says they should be 41-805 but what's in the car right now is AC 41-974.
What the heck???? A set of plugs shouldn't be this tough to figure out. I would like to stay with ACs but I need a correct number.
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10-13-2012, 09:27 AM
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#2
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DC Pit Crew Boss
Posts: 20,747
Member #71977
Member since: Apr 2008
Location: Louisville, KY
My Corvette(s)
2001 Navy Blue Metallic Coupe
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These are the ones you should be using.They are the ACDelco 41-110.
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"Marines - Making the other guy die for his country for over 200 years." |
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10-13-2012, 10:36 AM
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#3
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DC Crew
Posts: 5,580
Member #36463
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2000 Torch Red/Red Z51 coupe
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There have been 3 or 4 part numbers used over the years, each replacing the previous. That is the source of all the confusion.
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ASE Certified Automotive Repair Technician in: Suspension and Steering, Brakes, Electrical/Electronic Systems, and Heating and Air Conditioning
402 LS2- Callies Compstar crank/rods, Wiesco pistons, LG G5X3 114 LSA cam, LS6 heads, Edelbrock Victor water pump, Melling oil pump, Halltech air intake, Granatelli MAF, Jet-Hot coated LG long tube headers, Corsa Tigershark exhaust, AMW catch can, Hotchkis sway bars, Monster Level 3 clutch |
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10-13-2012, 10:42 AM
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#4
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DC Pit Crew Boss
Posts: 20,747
Member #71977
Member since: Apr 2008
Location: Louisville, KY
My Corvette(s)
2001 Navy Blue Metallic Coupe
Thanks: 51
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The 41-110 are the latest revision. I checked when I did mine and verified it again before I posted.
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"Marines - Making the other guy die for his country for over 200 years." |
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10-14-2012, 08:45 AM
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#5
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DC Crew
Posts: 42
Member #116949
Member since: Jun 2011
Location: Billings/MT/USA
My Corvette(s)
2002 coupe
Thanks: 0
Thanked 1 Time in 1 Post
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OK so 41-110 it is. Thank you for that. Now, are they supposed to be gaped at .060 or should they be gaped according to the service bulletin I saw on line of .040?
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10-14-2012, 08:54 AM
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#6
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DC Pit Crew Boss
Posts: 20,747
Member #71977
Member since: Apr 2008
Location: Louisville, KY
My Corvette(s)
2001 Navy Blue Metallic Coupe
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Thanked 229 Times in 176 Posts
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Quote:
Originally Posted by deanz02
OK so 41-110 it is. Thank you for that. Now, are they supposed to be gaped at .060 or should they be gaped according to the service bulletin I saw on line of .040?
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Verify the gap at .040 set from the factory and install with 1 drop of synthetic oil on the threads. Torque to 11 ft lbs. The electroplating on the spark plug threads IS an antiseize coating so none is required.
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"Marines - Making the other guy die for his country for over 200 years." |
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10-15-2012, 08:12 AM
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#7
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DC Crew
Posts: 42
Member #116949
Member since: Jun 2011
Location: Billings/MT/USA
My Corvette(s)
2002 coupe
Thanks: 0
Thanked 1 Time in 1 Post
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OK great. Many thanks for all the info. Are these plugs better to run than platinum or iridium types? Just thinking' these are not too tough to change but not exactly easy either. Mabie a plug that lasts longer would be better. Your thoughts and or experiences please.
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10-15-2012, 11:28 AM
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#8
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DC Pit Crew Boss
Posts: 20,747
Member #71977
Member since: Apr 2008
Location: Louisville, KY
My Corvette(s)
2001 Navy Blue Metallic Coupe
Thanks: 51
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The plug that I posted IS the Iridium plug, and you're supposed to b able to get 100,000 miles out of it. I know I got that out of my first set.
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"Marines - Making the other guy die for his country for over 200 years." |
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02-25-2013, 07:21 AM
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#9
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DC Crew
Posts: 30
Member #91427
Member since: Sep 2009
Location: Sylacauga/AL/USA
My Corvette(s)
yellow '69 and magnetic red metallic '05 Z51
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How to determine the need to change plugs
My early C6 Z51 has 146K miles and starts and drives just as strong as the day it was delivered. I bought a set of plugs when it turned 100K but I am waiting for any sign that they NEED to be changed. On my C3 it's easy to detect a spark plug misfire and I change them very regularly. I've been very impressed with how long most all the engine parts last on the C6 (brake pads and rotors lasted 133K, harmonic balancer pulley 143K, oil 13K on average, etc.).
So what prompted you to change your plugs?
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