Yzf42612 Posted February 24, 2019 Share Posted February 24, 2019 I just had injector cups put in my 2011 Mack mp7. The problem is went to start it and sound like a thumping sound out of my pipe coming from manifold to air to air. Please some one help can send video of it. Thank u Quote Link to comment https://www.bigmacktrucks.com/topic/55818-having-a-thumping-sound-out-of-my-intake-pipe-to-air-to-air/ Share on other sites More sharing options...
fjh Posted February 24, 2019 Share Posted February 24, 2019 (edited) Sorry only have examples of a gray engine doing this how ever if this is the first run RE check the valve set Bud to loose of a set on one exhaust will cause this on a gray engine this is a sign of lifter failure on a gray engine ! Check that all the valve yokes are in place yada yada GET IT CHECKED! Mp engines have been known to drop a piece out of the valve face as well ! Edited February 24, 2019 by fjh Quote Link to comment https://www.bigmacktrucks.com/topic/55818-having-a-thumping-sound-out-of-my-intake-pipe-to-air-to-air/#findComment-416554 Share on other sites More sharing options...
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