C5 / LS1 Spark Plug Replacement (recommendations)?
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Joined: Nov 2007
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From: Florida
C5 / LS1 Spark Plug Replacement (recommendations)?
Tiz the time to put in new spark plugs on my C5 (2000) any recommendations on plug selection (brand / part number)? AC delco (p/n 41-985) was recommended by the dealer. 
Any tricks to getting to the plugs or a special socket to get them out? Should I use PJ blaster to help release the old ones? Any contact grease recommended for the new ones? Best place to buy spark plugs? Web links to other post or web sites would be helpful. 
Any tricks to getting to the plugs or a special socket to get them out? Should I use PJ blaster to help release the old ones? Any contact grease recommended for the new ones? Best place to buy spark plugs? Web links to other post or web sites would be helpful.
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Joined: Nov 2007
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From: Florida
Would anyone know how the Bosch Platinum +2 (2 ground electrodes) and +4 plugs (4 ground electrodes) stack up? Ref p/n 4305 & 4458 according to the web site the gap is not adjustable, will this be an issue?
http://www.boschsparkplugs.net/resul...roductTypeID=1
http://www.boschsparkplugs.net/resul...roductTypeID=1
Race Director
Joined: Jan 2007
Posts: 16,513
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From: Official Dirty Dozen Member
the dealer gave you the correct plug for a stock motor
they work fine
forget the snake oil plugs
I use a double swivel impact spark plug socket with an impact extention from snap on.
works like a charm
a drop of oil on the threads is all you need
they work fine
forget the snake oil plugs
I use a double swivel impact spark plug socket with an impact extention from snap on.
works like a charm
a drop of oil on the threads is all you need
Race Director
Joined: Jul 2004
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From: Lake Havasu City, AZ
The stock Irridiums are a great plug with long life.
I have used Bosch +4 in ever car I have owned over the past 20 years except the C5. No issuees
I was happy with the Irridiums on the C5 so stuck with them.
I have used Bosch +4 in ever car I have owned over the past 20 years except the C5. No issuees
I was happy with the Irridiums on the C5 so stuck with them.
Racer
Joined: Aug 2008
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From: Fairbanks, Alaska
Stock AC Delco are great, dont buy into the hype of aftermarket plugs.
Le Mans Master
Joined: Feb 2002
Posts: 6,937
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From: Waldorf MD
I also use Bosch +4 on all my cars, including my C5, no problems, they run great.
BUT, I replaced my plugs in my C5 BEFORE the Irridiums came out, I would use the Irridiums now.
I use a universal joint on my socket and antiseeze on the new plugs' threads. A dab of diaelectric grease on the contact will make boots easier to remove in the future. Only one plug is tough, back one on driver's side.
BUT, I replaced my plugs in my C5 BEFORE the Irridiums came out, I would use the Irridiums now.
I use a universal joint on my socket and antiseeze on the new plugs' threads. A dab of diaelectric grease on the contact will make boots easier to remove in the future. Only one plug is tough, back one on driver's side.
Race Director
Joined: Jan 2007
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From: Official Dirty Dozen Member
I also use Bosch +4 on all my cars, including my C5, no problems, they run great.
BUT, I replaced my plugs in my C5 BEFORE the Irridiums came out, I would use the Irridiums now.
I use a universal joint on my socket and antiseeze on the new plugs' threads. A dab of diaelectric grease on the contact will make boots easier to remove in the future. Only one plug is tough, back one on driver's side.
BUT, I replaced my plugs in my C5 BEFORE the Irridiums came out, I would use the Irridiums now.
I use a universal joint on my socket and antiseeze on the new plugs' threads. A dab of diaelectric grease on the contact will make boots easier to remove in the future. Only one plug is tough, back one on driver's side.
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Pro
Joined: Dec 2004
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From: Livingston NJ
Am I the only one running NGK-TR55's?
Another vote for getting a set of plug wires while your in there. Gene culley has the red Z06 wires for $60 and the fit perfectly on the coils and the stock plug heat shields
Another vote for getting a set of plug wires while your in there. Gene culley has the red Z06 wires for $60 and the fit perfectly on the coils and the stock plug heat shields
Last edited by convertz; Oct 12, 2009 at 10:05 PM.
Instructor
Joined: Aug 2007
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From: Glen Cove New York
Pro
Joined: Apr 2005
Posts: 666
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From: Mt. Pleasant SC
I agree with using the Irridiums. I took four of mine out of my 2000 this weekend and after 40K miles they look like new. Replace your stock plug wires too. I am very happy with the MSD wires. Don't forget to use the heat protectors that were there from the factory. And as others have said, use anti-sieze on the plug threads and dielectric grease at both ends of the plug wires.
Team Owner
Joined: Sep 2003
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From: Raleigh / Rolesville NC
then went to the AC Delco and plugs and wires. I like these better
3rd Gear
Joined: Aug 2006
Posts: 3
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From: Near Providence, RI Massachusetts
I've tried the NGK TR-55's each spring the last two years.
There must be a coating or plating on them cuz after 3500-6000 miles the
"H.P."-feel of these plugs are gone. But for those first few thousand miles, the NGK's are great.
There must be a coating or plating on them cuz after 3500-6000 miles the
"H.P."-feel of these plugs are gone. But for those first few thousand miles, the NGK's are great.
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Joined: Nov 2007
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From: Florida
On a new set of Delco plugs do you have to mess with the gap?
Got part numbers for new plug wires? I’m used to MSD products. I usually go to Summit for that kind of stuff.
I haven’t dug around that part of the engine that much, do you have to take anything else off beyond the plastic valve cover shields? I learned its best to get all the intel you can before diving in on C5 maintenance.
Got part numbers for new plug wires? I’m used to MSD products. I usually go to Summit for that kind of stuff.
I haven’t dug around that part of the engine that much, do you have to take anything else off beyond the plastic valve cover shields? I learned its best to get all the intel you can before diving in on C5 maintenance.
