C4 L-98 Sparkplug Change
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Heel & Toe
Joined: Jun 2003
Posts: 17
Likes: 1
From: Zionsville In
C4 L-98 Sparkplug Change
Has anyone had experience with the Bosch 4 electrode plugs ? And what is the secret to remove and replace the right bank plugs? Mine look like they never have been changed (57k miles). The car runs clean at high revs but burbles a bit above idle.
Team Owner
Joined: Sep 2001
Posts: 62,139
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
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Re: C4 L-98 Sparkplug Change (janman)
secret? the secret may be to put tape on your knuckles so they dont get cut up
the pass side is not terrible, except for the one in front under the compressor, but you might need better tools (ones that bend in the middle or in several places) so you have room to work
the pass side is not terrible, except for the one in front under the compressor, but you might need better tools (ones that bend in the middle or in several places) so you have room to work
Le Mans Master
Joined: Jul 2002
Posts: 5,818
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From: Alive and well in Burlington NC
Re: C4 L-98 Sparkplug Change (janman)
Remove the inner fender well on the PS. Makes that plug a little easier to get to. Also, some swivels and short extensions help a lot.
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
Re: C4 L-98 Sparkplug Change (janman)
It's not realy a secret...just not very well documented.
The left side plugs can all be gotten with a spark plug socket and a 3/8" drive.
To ease access to the right side spark plugs, remove the plastic access panel from the inner fender well just over the top of the shock, remove the A/C compressor rear strut and remove the two AIR tubes. Then use an extension and swivel to get at the two front plugs and the spark plug socket with a 5/8" box-end wrench to get the two rear plugs.
Changing spark plugs is about a 1hr job, using the above scenario.
Don't foreget to clean the spark plug threads and use a littel anti-sieze on the threads.
The left side plugs can all be gotten with a spark plug socket and a 3/8" drive.
To ease access to the right side spark plugs, remove the plastic access panel from the inner fender well just over the top of the shock, remove the A/C compressor rear strut and remove the two AIR tubes. Then use an extension and swivel to get at the two front plugs and the spark plug socket with a 5/8" box-end wrench to get the two rear plugs.
Changing spark plugs is about a 1hr job, using the above scenario.
Don't foreget to clean the spark plug threads and use a littel anti-sieze on the threads.
