On Jul 16, 5:49*pm, "Steve" wrote:
I looked up the numbers on the module, its the same module that is used on
all gm igntions systems. Remember this is a 2005 with the electronic
iginition.
There is no mechanical advance or vacuum advance. it is all done in the
module.. As far as the coil goes, I looked up the numbers off the coil, same
coil (different mount) as a coil off of a 1987-1994 gm blazer or anything
with the 4.3 v6 OR the small block V8

"jamesgangnc" wrote in message

...
On Jul 15, 2:09 pm, wrote:





On Fri, 15 Jul 2011 10:41:07 -0700 (PDT), jamesgangnc

wrote:
On Jul 15, 12:54 pm, wrote:
On Fri, 15 Jul 2011 05:24:15 -0700 (PDT), jamesgangnc

From a car? How did you manage to get a car electronic ignition to
work on a merc? Not saying it can't be done but why?

Why not. These I/Os are basically just auto/truck engines with
marinized parts where they might spark. (alternators starters etc)-
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Yes, but the trigger and the trigger module are generally designed to
work as a pair. And on boats there is no vacuum advance and often no
mechanical advance either. All the advance is handled by the module.
On cars the vacuum advance was used because the engine load is not
consistent like it is on a boat. Then all of that changed completely
when cars went to computerized spark controls. Could you make a car
one from the era when cars still had them work, sure. But it's not
just going to plug in to the thunderbolt connector.

I got the impression he was just testing to diagnose an idle problem.-
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And I was asking how exactly he did that. *He said he used a car
module. *Well the only ignition module I know of that plugs into the
merc harness is the merc thunderbolt one. *And you won't get the merc
one off a car. *So I wanted more details. *No matter why he did it I
don't understand how he did it.

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Yes, I realized it was electronic ignition. Merc has had electronic
ignition for a pretty long time. Since late 80s I think. I didn't
know they had started switching over to gm modules, for a long time
they made their own thunderbolt module. The early automotive modules
still relied on vacuum advance to detect when the engine was under a
load at low rpm. Today on cars the computer controls everything and
most cars now have gone to individual coil/module packs per spark
plug.

I still would put the electronics at the bottom of my list. Heat
associated failure of electronics is generally always total failure
until it cools back down.

I still suspect heat soak of something though. Did you try leaving
the engine cover off for a day to see if that delays or eliminates the
problem?