The reason (most of the time) for IMRC failure on our cars is debris getting inside of the dc motor housing. This combined with high radiant heat from the exhaust manifold makes for a 20-25 HP loss when the IMRC fails. Sometimes the motor will partially work the butterflies open, but not all the way once failure has set in.
The cure is as simple as taking a can of electronics cleaner and spraying it inside of the dc motor when the engine is COLD. Please don't try it when the engine is hot! You WILL combust!! Most auto parts stores carry electronics cleaners. I don't mean ELECTRICAL PARTS CLEANER I mean electronics cleaner. Trust me, there is a difference in the two. And yes, heat does have alot to do with how swiftly the IMRC operates. There are ways to shield most of the heat out of the IMRC box. Do some searches for heatshielding on the web.
[url=http://www.jcwhitney.com/webapp/wcs/stores/servlet/ProductDisplay?productId=5170&catalogId=10101&langId=-1&storeId=10101]COOL IT thermal heatshielding material
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[image]http://www.jcwhitney.com/wcsstore/jcwhitney/images/imagecache/I20480.gif;pv9bf69080c6b237d5[/image]
This looks to be some pretty good stuff for general heatsheilding. It just depends on whether you are anal retentive about looks.


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