Go Back  Offshoreonly.com > Technical > General Q & A
1996 7.4 mpi Timing question >

1996 7.4 mpi Timing question

Notices

1996 7.4 mpi Timing question

Thread Tools
 
Old 10-27-2012 | 02:33 PM
  #1  
Thread Starter
Registered
 
Joined: Apr 2009
Posts: 110
Likes: 0
Default 1996 7.4 mpi Timing question

Again thanks again for all the help with getting my motor to get spark its now fixed and running great but i have a question about the timing I set the timing by the manuel at 8 degrees before top dear center runs great but it idle at 800 rpm and the book says to idle it at 650-700 but their is no linkage adjustiment left , the butterflys are closed , but i noticed if I set the timing at 4 degrees before top dead center it runs fine and idles at 650 rpm is this acceptable or will it harm my motor , Thanks James
jimmie is offline  
Reply
Old 10-27-2012 | 03:28 PM
  #2  
racinfever's Avatar
Registered
 
Joined: Nov 2005
Posts: 635
Likes: 2
From: cincinnati ohio
Default

Did you ground the timing module when setting timing?
racinfever is offline  
Reply
Old 10-27-2012 | 05:49 PM
  #3  
Thread Starter
Registered
 
Joined: Apr 2009
Posts: 110
Likes: 0
Default Yes back to neg on battery and pos to pos in battery

Yes black to neg and pos to pos on battery
jimmie is offline  
Reply
Old 10-27-2012 | 06:18 PM
  #4  
Thread Starter
Registered
 
Joined: Apr 2009
Posts: 110
Likes: 0
Default

Originally Posted by racinfever
Did you ground the timing module when setting timing?
now i wondering what do you mean by timing moduel ?
jimmie is offline  
Reply
Old 10-27-2012 | 06:54 PM
  #5  
Registered
 
Joined: Jun 2012
Posts: 143
Likes: 0
From: Cincinnati OH
Default

Here is a link to a cool little tool that will put the mpi into base timing mode
http://www.rinda.com/marine/marine.htm

I thing it can be done with a jumper wire as well I'll see if I can find one of the threads and post it for you
Z06vette1 is offline  
Reply
Old 10-27-2012 | 07:12 PM
  #6  
Thread Starter
Registered
 
Joined: Apr 2009
Posts: 110
Likes: 0
Default mercuriser

cool i appericate it
jimmie is offline  
Reply
Old 10-27-2012 | 07:50 PM
  #7  
Registered
 
Joined: Jan 2004
Posts: 4,480
Likes: 43
From: Tennessee
Default

You have to jump the A and B pins in the data plug. That will put the ecm in base timing mode. Then, set the timing to 8 deg. BTDC. You can either use the Merc timing jumper, a small piece of wire, or a paperclip. I use the paperclip since I can never find the Merc tool in the shop when I need it. Once you put the jumper in, you may need to rev the engine up to 1500 rpm or so to get the timing to stabilize.
Eddie
Young Performance is offline  
Reply
Old 10-27-2012 | 09:12 PM
  #8  
Thread Starter
Registered
 
Joined: Apr 2009
Posts: 110
Likes: 0
Default Timing

cool thanks man
jimmie is offline  
Reply
Old 10-29-2012 | 04:41 PM
  #9  
Registered
20 Year Member
 
Joined: Feb 2002
Posts: 6,656
Likes: 20
From: Lake Michigan
Default

Part Number...805747A2 , TIMING TOOL, EFI
1800rpm
$12 bucks from Bam Marine
Back4More is offline  
Reply
Old 10-29-2012 | 05:51 PM
  #10  
Registered
 
Joined: May 2007
Posts: 518
Likes: 3
From: On a Boat
Default

Originally Posted by Back4More
Part Number...805747A2 , TIMING TOOL, EFI
1800rpm
$12 bucks from Bam Marine

Paper clip free
tunertech is offline  
Reply


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.