Results 1 to 1 of 1
  1. #1

    Default '91 454 Crusader's with 1150 hours

    At 2700 RPM's we begin to experience a cough and popping from the Starboard engine. The popping and coughing will continue until we drop lower than 2700 RPM's. Then the engine runs smooth.

    We have replaced the plugs, distributor, wires, coil, ignition modulator, rebuilt carb., risers replaced, exhaust manifold is new, intake manifold gasket replaced and engine was timed with a light.

    Engines are well maintained with annual service. This current amount of work done was preventative maintenance. The problem arose during the under load sea trial and continues.
    Engine runs fine at dock with increased RPM's. Only under load does this coughing and popping occur.

    What the heck can it possibly be? Thanks for your ideas.
    Last edited by cathy azure; 11-12-2014 at 07:26 PM.

Similar Threads

  1. 1998 Crusader 7.4L, 320hp Fuel Injected ECM hours
    By scaycht in forum Crusader Marine Engine Forum
    Replies: 3
    Last Post: 03-09-2014, 11:37 AM
  2. C18 1150 hp
    By extra300 in forum Caterpillar
    Replies: 0
    Last Post: 06-10-2012, 09:20 PM
  3. 1990 crusader 690 hours fresh water only
    By 40208n in forum Crusader Marine Engine Forum
    Replies: 6
    Last Post: 04-07-2011, 10:06 PM
  4. 978 Mercury 1150 Outboard
    By ronw in forum Mercury Mariner Outboard Archive
    Replies: 3
    Last Post: 06-11-2007, 10:52 PM
  5. 350 Crusader Engines 1994 with 100 hours
    By Jeff Norton in forum Crusader Marine Archive
    Replies: 4
    Last Post: 08-09-2002, 12:58 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts