Please note this thread has been inactive for 90 days. For the best results, please start a new thread.
Results 1 to 4 of 4
  1. #1
    Seaman Apprentice
    Join Date
    Jun 2008
    Posts
    48

    Default 2003 Mercury 115 Hard starting

    2003 115 Mercury 115 Saltwater (carb) starts great when cold but after it is warmed up you have to choke it to start. You have to crank it a few times, like 5 seconds each time,to get it started. Runs great when it starts. There is approx 400 hours on it. Any suggestions would be great. Thanks

  2. #2
    Captain
    Join Date
    Aug 2009
    Location
    Savannh Georgia
    Posts
    3,273

    Default Re: 2003 Mercury 115 Hard starting

    I have a motor like that also...I throttle it up slightly each time I go to start it when its hot. cranks like a champ then with no choke. I am not sure what you could do to improve it.
    Free ignition troubleshooting guide http://issuu.com/cdielectronics/docs...owFlipBtn=true
    You will need a DVA adapter http://www.usatoolwarehouse.com/usat...e/ESI-640.html First test compression, Second test spark with a spark gap tester set a 7/16 gap, Third check timing, next CLEAN your carbs properly,

  3. #3
    Seaman Apprentice
    Join Date
    Jun 2008
    Posts
    48

    Default Re: 2003 Mercury 115 Hard starting

    Quote Originally Posted by SparkieBoat View Post
    I have a motor like that also...I throttle it up slightly each time I go to start it when its hot. cranks like a champ then with no choke. I am not sure what you could do to improve it.
    I will try starting with more throttle and no choke to see if that helps
    Thanks

  4. #4
    Supreme Mariner Silvertip's Avatar
    Join Date
    Sep 2003
    Location
    Midwest
    Posts
    25,008

    Default Re: 2003 Mercury 115 Hard starting

    Just a tip: Most modern engines (carbed or EFI/DFI) start easily if a proper starting procedure is used. If you need to crank for extended periods to get an engine to fire you are obviously doing something wrong or the engine needs attention. With carbed engines (hot or cold) about 75% of the starting issues are operator error.

Similar Threads

  1. 2003 Nissan 25hp 4 stroke hard starting issue
    By oakfam in forum Honda & Tohatsu/Nissan Outboards
    Replies: 5
    Last Post: August 30th, 2010, 02:53 PM
  2. 2003 Mercury 125 hard starting/idle when warm
    By nightshifter in forum Mercury & Mariner Outboards
    Replies: 0
    Last Post: June 19th, 2009, 05:02 PM
  3. 2003 115 hard starting
    By elk2009 in forum Mercury & Mariner Outboards
    Replies: 2
    Last Post: February 18th, 2009, 08:50 PM
  4. 2003,15 hp.2cycle outboard,hard starting problem randonly
    By driftermantravis in forum Mercury & Mariner Outboards
    Replies: 3
    Last Post: September 14th, 2004, 02:04 PM
  5. 2003 60H.P. Mercury Hard Start When Warm
    By smoker craft dave in forum Mercury & Mariner Outboards
    Replies: 1
    Last Post: September 16th, 2002, 08:33 PM
  1. iboats Forum Directory - Over 100,000 forum posts organized by topic