4.3 mercruiser ignition control module -HELP

[vernonbluewater]

Does anyone know how often these fail ? If they do what are the results. I have gone thru thunderbolt ignition checklist & still have no spark. The last thing to do is replace ICM. @ $400.00 not sure i'm ready to part with money if this is not it.

 

[Bt Doctur]

Re: 4.3 mercruiser ignition control module -HELP

have you removed the tach lead from the coil and checked the shift interupter?

 

[vernonbluewater]

Re: 4.3 mercruiser ignition control module -HELP

Hi Bt Doctur - thanks for your suggestion. I have not done this - Would you know what colour the tach lead is , what does the shift interupter look like & where is it located.(does it have a nylon roller on it?), To check shift interupter do I bypass it? Also do Ignition control modules fail ? I look forward to your response - thanks again.

 

[Bondo]

Re: 4.3 mercruiser ignition control module -HELP

Ayuh,... The factory manuals are up in the Adults Only section at the top of this forum...
There's Step by Step diagnostic trees in 'em...

 

[vernonbluewater]

Re: 4.3 mercruiser ignition control module -HELP

Bt Doctur & Bond-o, you guys rock! I disconnected shift interupter (after looking @ manual in Adult section) got spark! Boat started right away, idled fine & didn't stall. Thankfully marine store had parts (had to buy whole assembly to get switch as it has been updated) not bad though @ $160.00.
Went for a cruise yesterday - ran great! Thanks again for your advice. Now if I could figure how to buy you guys a beer.

 

[caravelle 2000br]

Re: 4.3 mercruiser ignition control module -HELP

Dude I am on my third one and still no fix I am going to look for shorts again in the wiring harness if I don"t find any than I am going to go to a Mallory ignition system.

 

[Titanty]

Re: 4.3 mercruiser ignition control module -HELP

OP,
Was your interupter switch blowing fuses too?

 

[Ferds]

Re: 4.3 mercruiser ignition control module -HELP

Hi

New to this site and forums, where can I locate the adult only section at the top of the forum.

 

[Ferds]

Re: 4.3 mercruiser ignition control module -HELP

have you removed the tach lead from the coil and checked the shift interupter?

Hi
I have the same problem with no spark on a 4.3 mercruiser v6. Think it may be the ignition control module but not sure. Do not want to buy one until I am sure this is the problem as it is also very expensive here in Spain. Can you help and how do I access the manual in Adult section. Thanks your your help.

 

[dingdongs]

Re: 4.3 mercruiser ignition control module -HELP

the very first page at the top written by Sticky.its at the top and about 3 or 4 posts later everyone starts there problems.

 

[Blk-n-Blu]

Re: 4.3 mercruiser ignition control module -HELP

Here ya go:http://forums.iboats.com/showthread.php?t=288430

 

[Ferds]

Re: 4.3 mercruiser ignition control module -HELP

Thank you for your help, disconnected shift interupter and i got a spark.
You guys saved me the cost of a new ICM.

 

[Billy6567]

Re: 4.3 mercruiser ignition control module -HELP

First, I'm Billy and I am a new to the site. I have a 1995 Mercruiser 4.3 also with no spark. I have replaced the coil and disconected the shift interrupter. Any idea on how to check the Ign Ctrl Mod before spending $400 on a new one? Any help is appreciated.

P.S. The motor uses a thunderbolt IV Ign if that helps.

 

[Eric 3.7LX Alpha 1]

Re: 4.3 mercruiser ignition control module -HELP

Hey Billy, Welcome aboard. You should start a new thread for your problem instead of asking in someone else's. It will get answered correctly that way.

 

[John_S]

Re: 4.3 mercruiser ignition control module -HELP

First, I'm Billy and I am a new to the site. I have a 1995 Mercruiser 4.3 also with no spark. I have replaced the coil and disconected the shift interrupter. Any idea on how to check the Ign Ctrl Mod before spending $400 on a new one? Any help is appreciated.

P.S. The motor uses a thunderbolt IV Ign if that helps.

http://www.boatfix.com/merc/Bullet/92/92_11.pdf

 

[Billy6567]

Re: 4.3 mercruiser ignition control module -HELP

Thanks for the info and the advice.