85 Blackmax 150 Spark problem

[tysdad2010]

Lost spark on 4 cyclinders on 1985 Mercury Blackmax 150... 3 are down on one side and middle one on other side is down ...what would cause that problem?

 

[Faztbullet]

Re: 85 Blackmax 150 Spark problem

Pull all the spark plugs and retest.. If spark returns its low cranking speed due to bad/weak battery, corroded ends or bad cables or weak starter. If it does not return disconnect the white/black wire off the switch boxes and test , if ok leave the idle stabilizer disconnected and just reinstall jumper. If ok the stabilizer was bad or if not the bias circuit in packs may be bad. Also could be a trigger but not as likely... maybe a stor if above test check out..

 

[tysdad2010]

Re: 85 Blackmax 150 Spark problem

Pull all the spark plugs and retest.. If spark returns its low cranking speed due to bad/weak battery, corroded ends or bad cables or weak starter. If it does not return disconnect the white/black wire off the switch boxes and test , if ok leave the idle stabilizer disconnected and just reinstall jumper. If ok the stabilizer was bad or if not the bias circuit in packs may be bad. Also could be a trigger but not as likely... maybe a stor if above test check out..

All batteries are around a year old and are still in great shape on holding charge...no corroded ends...no bad cables...and it has a brand new starter just installed a few weeks ago along with selenoid...I am really stuck on what EVERYONE is call the Idle stabilizer...can someone please provide me with a picture of some sort please?

I just went ahead and ordered 2 new powerpacks $229.70 shipped I know it needs them anyways... the one that are currently on there are really old ... my next things to check are stator.... and trigger....But wont be able to do that untill Monday night...Powerpacks should be here Tuesday or Wednesday...

 

[tysdad2010]

Re: 85 Blackmax 150 Spark problem

Well I got my boat back Friday night and It runns great now and starts up first try It was the Powers backs and Stator...Thanks for the Excellent parts Iboats!