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 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 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.