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

Did you ground the timing module when setting timing?

Yes back to neg on battery and pos to pos in battery
 

Yes black to neg and pos to pos on battery

now i wondering what do you mean by timing moduel ?

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

mercuriser
 

cool i appericate it

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

Timing
 

cool thanks man

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

Paper clip free