2003 2004 2005 2006 Montero 3.8L major engine failure cause - Mitsubishi-Forums.com
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post #1 of 2 (permalink) Old 03-19-2017, 10:17 PM Thread Starter
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2003 2004 2005 2006 Montero 3.8L major engine failure cause

I've now owned two each 2003 Montero Limiteds with 3.8L. *I think the same motor design was in all 4 years (03 thru 06). *I figured it out from a forum post I can't find anymore.*

Both of my Monteros around 165,000 miles lost several intake butterflies that are accessible when you remove the plummy plummy...haha the plenum.

If you haven't already I suggest you remove them too before they ruin your motor. *The come loose, because they're only held on by 2 dinky screws. They should have been welded, or something better...but live and learn.

Removing them doesn't seem to effect operation at 6,500 to 11,500 feet above sea level, where I live.

​​​​​​​A possible lawsuit? *I bet many of these came loose much earlier than 165,000 miles and blew motors up. *That's just when I discovered mine loose. They looked to have been there for a few thousand miles. *They were partially melted and broken in half. *All screws and some molten metal were ingested and likely did some harm to my motors. *But mine still run...tough or lucky, I got lucky. *They do so leak or consume about a quart of oil every 1,000ish miles.

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post #2 of 2 (permalink) Old 03-20-2017, 01:07 AM
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yes....a butterfly can go missing .....also when loose give a rattling sound from the plenum

a better lock tite and new screws is on option

..its a known DIY owner fix to remove plenum intake butterflies


Last edited by chain rattle; 03-20-2017 at 01:31 AM.
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