Question about 2004 Toyota Tundra

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Diagram to install spark plugs on a 2004 tundra

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Posted on Jan 02, 2017

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SOURCE: Can't find the spark plugs on a 2004 toyota tundra V-8

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.

Posted on Mar 02, 2009

ministock48
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SOURCE: How do I replace the spark plugs on my 2004 toyota

i believe on those the plugs go in through tops of the valve covers with a coil pack on top of each plug just unplug and un bolt the coil and remove and chang plugs

Posted on Oct 19, 2009

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How do I replace the spark plugs on my 2004 toyota tundra?


i believe on those the plugs go in through tops of the valve covers with a coil pack on top of each plug just unplug and un bolt the coil and remove and chang plugs

Oct 19, 2009 | 2003 Toyota Tundra

1 Answer

Can't find the spark plugs on a 2004 toyota tundra V-8


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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2004 Toyota Tundra spark plug


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.

Sep 30, 2008 | 2003 Toyota Tundra

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