difference between GM and Merc module?

C

capecodtodd

Petty Officer 2nd Class
Joined
Aug 11, 2010
Messages
128
I have a 1998 3.0 mercruiser that has been running very poorly and sometimes not at all. The trouble has been narrowed down to the timing and the module under the dist. cap has been found out to be junk. Question what is the difference between buying a module meant for the GM automotive 3.0 vs getting an actual mercruiser part. Would there be a problem with the spark advancing properly in the GM one?
A test was done with the old one following the timing procedure and it would not advance. From idle to 3000 rpm the advance stayed the same. What else could it be if not this module?
Thank you
Todd
 
Don S

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: difference between GM and Merc module?

Question what is the difference between buying a module meant for the GM automotive 3.0 vs getting an actual mercruiser part.
Click to expand...

There is no automotive equivalant for that engine and ignition. The 3.0L engine was NEVER used in a car. The modules are designed for marine use.
 
zbnutcase

zbnutcase

Commander
Joined
Sep 19, 2009
Messages
2,055
Re: difference between GM and Merc module?

The auto module, even though they look identical, are not. The car one is designed to interface with a PCM,(computer) while marine 3.0L is a stand-alone unit.
 
You must log in or register to reply here.
Top