Changed plugs on my 98 LS400 today
09-01-02, 12:35 AM
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Changed plugs on my 98 LS400 today
Changed plugs today on my 1998 LS400 today. The car was running fine, but since I bought it with 47K on it, wasn't sure what kind of condition the plugs were in. The car now has 49K on it. Not as bad as I thought it would be. Purchased NGK Iridium factory plugs to install - part number IFR6T11. As someone on the forum stated before, the left side is fairly easy. You need a 10 inch extension, 10 mm socket, 16 mm deep socket , and I used a 3/4 inch ratchet. Remove the screw that holds the coil in place on each plug. Gently pull out on the "coil over" bushing and it will eventually free up, and you can pull it out about an inch - then disconnect the Molex plug. This plug was kind of stuck on some of the plugs and was difficult to remove, so I used a flat head screw driver and used a little leverage.
Once you unplug the Molex connector, the coil is free of any attachments and you can pull it all the way out - the each "coil over" is about 6 inches in length. Using your 10 inch extension along with the 16 mm socket, you can unscrew the plug. But because the 16 mm deep socket has no way to grab on to the plug once it's removed, I had to use a loose screw grabber and grab the spark plug by the top and pull it out. Rear plug on the drivers side is a little difficult, since the brake fluid reservoir is kind of in the way. So I used a 6 inch extension with a swivel adapter attached to the 16 mm Socket to loosen the plug.
Now comes the right side. The plug closest to the firewall is easy, since nothing is in the way. in order to get at the other 3 plugs, you have to remove the 2 screws holding part if the intake and undo the 3 hoses attached to it - along with undoing the clamp on the hose going into the air filter assy and the clamp holding on the air filter assy that leads into the engine.
Once you have removed this assy, you can remove and install the other 3 plugs.
NGK factory plugs list ~ 14 dollars apiece. I gaped each plug at 0.043. The guy sold them to me for 10.00 each The car runs great and has better acceleration. Also change the air filter and air conditioning filter while I was at it.
Next, I'll replace my front two rotors. Local dealer wanted $ 530.00 for this. Has to be a cheaper way :-)
Thought this might be useful for someone else.
Later
Once you unplug the Molex connector, the coil is free of any attachments and you can pull it all the way out - the each "coil over" is about 6 inches in length. Using your 10 inch extension along with the 16 mm socket, you can unscrew the plug. But because the 16 mm deep socket has no way to grab on to the plug once it's removed, I had to use a loose screw grabber and grab the spark plug by the top and pull it out. Rear plug on the drivers side is a little difficult, since the brake fluid reservoir is kind of in the way. So I used a 6 inch extension with a swivel adapter attached to the 16 mm Socket to loosen the plug.
Now comes the right side. The plug closest to the firewall is easy, since nothing is in the way. in order to get at the other 3 plugs, you have to remove the 2 screws holding part if the intake and undo the 3 hoses attached to it - along with undoing the clamp on the hose going into the air filter assy and the clamp holding on the air filter assy that leads into the engine.
Once you have removed this assy, you can remove and install the other 3 plugs.
NGK factory plugs list ~ 14 dollars apiece. I gaped each plug at 0.043. The guy sold them to me for 10.00 each The car runs great and has better acceleration. Also change the air filter and air conditioning filter while I was at it.
Next, I'll replace my front two rotors. Local dealer wanted $ 530.00 for this. Has to be a cheaper way :-)
Thought this might be useful for someone else.
Later
09-23-02, 02:54 AM
#3
Next, I'll replace my front two rotors. Local dealer wanted $ 530.00 for this. Has to be a cheaper way :-)
I need to replace my front rotors, too but no luck on finding....
Brembo don't make them... is it possible to resurface the rotors in stead of replacing them even the rotor bend??
thankx
02-20-07, 08:58 PM
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02-21-07, 12:43 AM
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About the rotors, they will need to be measured so you can find out if there is enough material left to be turned and still be within spec. Its very possible the rotors can just be turned and you won't need to spend the $$ on new ones, but it would depend on how your specific brakes are wearing (uneven wear will lessen the possibility of being able to turn them). If there is not enough material then you'll need to buy new ones. Getting rotors turned does not require special factory equipment, any shop with a lathe should be able to do it, my local parts shop does it for $10 per rotor. Getting the rotors measured should be free.
02-21-07, 07:49 AM
#11
I spent a good 1/2 hour searching for this tutorial....great to now have it at arm's length. Drifter, I plan to do the swap sometime this week, so if you want, I'll be happy to take the pics.
Another good thing to add is the spark plug type. I'm installing Denso IK20's (.4mm electrode) which is a higher performance plug (but may last only 30k miles).
Grand_LS & PD, thanks for keeping this site informative!
Another good thing to add is the spark plug type. I'm installing Denso IK20's (.4mm electrode) which is a higher performance plug (but may last only 30k miles).
Grand_LS & PD, thanks for keeping this site informative!
Last edited by lexusnutt; 02-21-07 at 08:09 AM. Reason: addition
02-21-07, 03:37 PM
#12
I spent a good 1/2 hour searching for this tutorial....great to now have it at arm's length. Drifter, I plan to do the swap sometime this week, so if you want, I'll be happy to take the pics.
Another good thing to add is the spark plug type. I'm installing Denso IK20's (.4mm electrode) which is a higher performance plug (but may last only 30k miles).
Grand_LS & PD, thanks for keeping this site informative!
Another good thing to add is the spark plug type. I'm installing Denso IK20's (.4mm electrode) which is a higher performance plug (but may last only 30k miles).
Grand_LS & PD, thanks for keeping this site informative!
) and PM me the links to them.
02-21-09, 07:19 PM
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guys this thread is years old...
www.lexls.com has a guide on doing your rotors etc...
we dont really need this thread.... not to mention the OP only posted once on this site.
www.lexls.com has a guide on doing your rotors etc...
we dont really need this thread.... not to mention the OP only posted once on this site.