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Poking around my engine trying to find the source of a dead spot at idle and running rich, I discovered some cracks (more like holes) on my upper air plenum. I've never seen cracks so big on a plenum (pic attached), what could have caused this? Also, I would have expected my engine running much worst and having the engine light on. It even passed emissions with flying colors, and I know I had the engine miss when I did emissions so I think the cracks were already there.
Dealer wants $940 for it (part only). Can you guys recommend a good national junkyard that I can source the part from? Thank you much!!


Hi Chelo & welcome to 4x4wire's Mitsu forums.

It's not common for them to crack that I can recall however it is common for the internal butterfly valve to fail and I wonder if it could have been ingested into the engine intake and then somehow spit back out? Not sure but I am confident others will chime in to try and help diagnose what happened.

As for as a used one, try car-part.com for a network of salvage yards where you can likely find a donor part. <img src="/forums/images/graemlins/kewl.gif" alt="" /> <img src="/forums/images/graemlins/cheers.gif" alt="" />

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