Re: Can't find the spark plugs on a 2004 toyota tundra...
If the engine is the same as my 2002, they are a Hemi-style which go right into the valve covers, hidden under the individual coil packswhich can be removed by loosening one nut I believe. After you remove the nut, pull straight out and you will see the Spark plug cap is attacked to the bottom of the coil pack, use an extension and a spark plug socket preferably with a rubber grommet inside it or you will play hell getting the plugs out of the wells once they are loose.
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www.tundrasolutions.com/...tundra/187079-2005-tundra-spark-plug-con... Mar 20, 2010 - 9 posts - 6 authors
I have a 2005 DC 4x4 4.7 which is due for spark plugs. I read about ... The spark plug gap spec for the 4.7L 2UZFE is .032. The V6, IIRC, is .044 ...
Code 0308 indicates a misfire was detected in cylinder 8. You say you checked the fuel injector and it is OK. Other probable causes include:
1. Control unit software in need of updating
2. Faulty PCM or ECM
3. Ignition system wires
4. Fuel system
The spark plugs are at the end of the
coil packs. Remove the coil (10mm bolt) and pull the coil up. Use a 6 to
10 inch extension on a 5/8 spark plug socket and the plugs come right
out. The valve covers don't have to come off. Click the links below.
The causes for spark plugs leaving the cylinder head are as follows:
1. The threads in the cylinder head were compromised, as in cross-threading.
2. The spark plug, when replaced, was not tightened down properly (like only 2-3 threads in)
3. A combination of the above.
Whe the plugs are fully seated in the cyl heads, and are at the proper torque, it would be extremely RARE for the plug to be jettisoned by the compression of the pistons. You only have roughly 175-185 PSI compression, this will NOT defeat the retention of the threads. Look at the hole in the head...How may threads are damaged? If it is just the end of the hole, the plugs was not in "all of the way". If ALL of the threads are bad, the plug was inserted improperly, and damaged the threads in the head. Rethreading (a "heli-coil") will correct you condition, if properly done.
Hope this helps.