How to replace spark plugs on 2002 Highlander?

[LifeTech]

A Hybrid was used for test purposes and the Dyno results were given as a "Net Gain". If yu know a little about Hybrids... Net HP is a combination of Brake HP and the Traction HP of the Batteries measured in Kwh. A very moot point was made by the Mfr of these plugs. (well they do not even refer to them as spark plugs.. like they are "special") And I do not trust the Dyno results. How true were these Independant tests????

If yu want to experiment...do it wisely and be methodical about your data collection. But I would not waste my time on any other spark Plugs.

Been there done it. Stay with the OE.
Toyota prevails in quality vehicles.. largely due to there engine designs. I won't deviate much from the intended design. Especially the ignition system.

Stay away.. Just my opinion.

With the gas crisis these days many are finding themselves looking for many ways to improve MPG.. And there are many companies that feed on this frenzy. Caveat Emptor!

LT

[MD Highlander Guy]

I replaced the plugs in my 2003 Highlander V6 with dealer spec plugs and - as we all know and I found out the hard way - the front 3 plugs were easy and the rear 3 were a PIA. I took the engine plastic cover off and was able to get my hand/arm thru the manifold and get to the back 3. I used a Craftsman shorty ratchet to do so and all has been well for 20k+ miles. Hope that helps.

[erubin]

I just finished replacing the spark plugs in my 2002 Highlander and did not remove the intake manifold. It is doable but time consuming, and as noted, you need somewhat small hands. It took about three hours, the same amount of time that would probably be needed to remove and replace the intake manifold I figure unless you're an experienced mechanic.