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Originally Posted by Chevota
Carbon build-up on a port injected car? Hmmm, I looked at the blade on my car a few months ago (65Kmiles) it was very clean, I guess I'll check the ML next chance I get. The problem appeared suddenly so I was thinking it would be something electronic. The ML is 3 hours away and nowhere near a dealer, so when I go look at it I want as much info as possible.
Thanks...
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On a normal vehicle your hunch would be right, C, but MB had a funny little habit of recirculating PCV air in above the butterfly valve in the 90's, providing another method of carboning for those normally shiny throttle valves...