Spark plug replacement and gas mileage
Thread Starter
Lead Lap
Joined: May 2006
Posts: 3,680
Likes: 302
Don't you have to remove the Valve Covers in order to replace the spark plug seals? I was told they can get hard as rocks and difficult to remove the spark plug seals. I had my valve cover gaskets replaced last year and I had given that tech the spark plug seals but don't trust him that they were changed.
Instructor
Joined: Dec 2015
Posts: 878
Likes: 232
From: Arizona
You do have to remove the valve covers to replace the tube seals. There is no tube to remove except the coil itself as they seal the valve cover to the coil. The seals come out from the bottom and are held in with 4 metal tabs each that need to be bent out of the way. With the tabs out of the way it can still be difficult to remove the seals. Mine were hard like plastic. I used a combination of tapping them down from the top with a hammer and screwdriver and prying them from the bottom. The new ones are a tight fit as well and must be installed carefully making sure its installed with the correct orientation.
Last edited by 911LE; Dec 6, 2016 at 07:41 AM.
Driver School Candidate
Joined: Oct 2013
Posts: 3
Likes: 1
From: WA
No need to ponder, the Lexus engineers have already figured out the best time. As per Canadian maintenance schedule, 12 years or 192000 km, whichever comes first.
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NCLexi250
IS - 2nd Gen (2006-2013)
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Oct 15, 2011 05:54 AM
