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Old    Nacho (denverd1)      Join Date: May 2004       08-16-2016, 9:16 AM Reply   
2006 EFI Merc Black Scorpion in Sanger V230

Started the season off with fresh fuel filter, separator and impeller. Been out quite a few times since then, boat was hesitant to start first time out after service. Thought it was air working its way out of fuel system.

Now at least 15 engine hours later, I still have an issue after about 5 minutes of being on plane running 15 - 20 mph. Engine will stumble and drop anywhere from a few hundred to a thousand RPM. Often perfect pass revs it a bit and you can barely tell a difference in the wake. Other times, we have to drop the rider and restart cause the boat won't maintain speed. Never dies, solid hole shot, cranks every time. So that rules out bad gas I thought I got from a shady station.

Acts like a fuel pump issue, losing pressure after a few minutes of running it. Only 370 hours, so I'm not convinced its the pump. Can hear it power up and charge the system with key on. Keep going back to my garage mechanic skills and not sure I primed the system properly.

I didn't fill the separator with gas when I put it back on, about the only thing I can think of.

Should I take the engine cover off and try check for air in fuel rail? Whats best way to get all the air out? Or do I have something else going on?
Old    BLAIR BARHAM (jonblarc7)      Join Date: Jul 2006       08-16-2016, 10:00 AM Reply   
Have taken the cap and rotor off and looked at the point to see if there corroded or changed the plug wires. I had to do this last year on my 06 supra. They had never been change and the boat started running like crap. I thought it was bad fuel too.
Old    Rick (CALIV210)      Join Date: Jun 2015       08-16-2016, 11:37 AM Reply   
Start with the basics . Make sure your battery voltage isnt dropping or fluctuating as well computer controlled engines need solid voltage one weak battery and a big stereo can wreak havoc . Bad gas could still be the issue or possibly a ton of water in the fuel . I'm not sure where you live but condensation will create a lot of water . And of course check the cap and rotor and everything else.
Old     (Jeff lyonz)      Join Date: Mar 2014       08-16-2016, 5:51 PM Reply   
Could buy an in line spark tester and make sure all plugs are good. Tool is only about 20 dollars.
Old    T (TTyler89)      Join Date: Jun 2015       08-16-2016, 8:04 PM Reply   
Does yours have the screw on fuel filter or the one in the black box housing that you loosen 3 bolts to remove?
Old    Red (Redheadd)      Join Date: Apr 2014       08-16-2016, 8:22 PM Reply   
Check all your electrical connections. At battery and block. Check cap and rotor/plugs/wires. If all checks out check fuel pressure at fuel rail.
Old    Nacho (denverd1)      Join Date: May 2004       08-17-2016, 10:18 AM Reply   
Thanks for the ideas. A little more background, I use the boat regularly. Batteries are 3 years old and in good shape. Haven't touched main grounds or any of that ever. I did recently add an amp and sub. but they're on a different battery separated from engine electrical system with a perko switch.

Gonna start with cap/rotors then go from there.

Quote:
Originally Posted by TTyler89 View Post
Does yours have the screw on fuel filter or the one in the black box housing that you loosen 3 bolts to remove?
I have a threaded oil filter style fuel/water separator. and a fuel filter in a black housing. I think the black filter had a plastic band holding it to the stringer

Last edited by denverd1; 08-17-2016 at 10:25 AM.
Old    Trayson Harmon (trayson)      Join Date: May 2013       08-17-2016, 10:36 AM Reply   
Quote:
Originally Posted by jonblarc7 View Post
Have taken the cap and rotor off and looked at the point to see if there corroded or changed the plug wires. I had to do this last year on my 06 supra. They had never been change and the boat started running like crap. I thought it was bad fuel too.
^^^^^THIS.

I was having hesitation and it was intermittent. I found all sorts of corrosion on my distributor cap. I thought that was THE issue, but while things were better after changing the plugs/cap/rotor, I still had issues. changed the plug and COIL wires and now the boat runs like a boss. I found some visible corrosion in the end of the coil wire, so I think that was certainly a factor. The plug wires were expensive (over $100) because they were specific to the Indmar setup, but got a bit of a discount at Bakes and it's so worth it to have a boat that runs well.
Old    BLAIR BARHAM (jonblarc7)      Join Date: Jul 2006       08-17-2016, 10:42 AM Reply   
Mine looked exactly like yours.^^^^
Old    Nacho (denverd1)      Join Date: May 2004       08-17-2016, 10:54 AM Reply   
at 370 hours, they've probably never been done. although it looks like someone recently numbered all the wires and marked them on the dizzy cap. I'll pop the cap off tonight and take a look.

thanks guys, I never would've thought to check cap and electrical system for what seems like a fuel delivery issue.
Old    Trayson Harmon (trayson)      Join Date: May 2013       08-17-2016, 10:59 AM Reply   
Quote:
Originally Posted by denverd1 View Post
at 370 hours, they've probably never been done. although it looks like someone recently numbered all the wires and marked them on the dizzy cap. I'll pop the cap off tonight and take a look.

thanks guys, I never would've thought to check cap and electrical system for what seems like a fuel delivery issue.
it's a spark issue. the boat is missing and retarding timing. Your boat is going FULL RETARD!!!

Make sure you also take a look at the terminations on your coil wire. that's where mine also had corrosion.
Old    Nacho (denverd1)      Join Date: May 2004       08-17-2016, 11:02 AM Reply   
NOOOOO!!!! lol!

ya know I saw some corrosion on what I think are coil leads. gonna pop black scorpion cover off take a look at things. fuel rail pressure, cap, etc
Old    T (TTyler89)      Join Date: Jun 2015       08-17-2016, 5:55 PM Reply   
I honestly don't think it's your cap and rotor, but you can check it and replace if you want. I would hook up a fuel pressure gauge and go out and run it in the same scenario that it does it to see if it's a fuel problem. The reason I say that is because typically a spark issue is really present under hard acceleration (hole shot). It doesn't run fine, then just cut out 5 mins later, then go back to running fine. It seems more along the lines of a fuel/air problem, but if your pressure never drops, then it's more towards a bad IAC or your coil breaking down once hot. Maybe even vapor lock. How hot has it been while you've been out running it?

Last edited by TTyler89; 08-17-2016 at 5:58 PM.
Old    Nacho (denverd1)      Join Date: May 2004       08-18-2016, 7:54 AM Reply   
under the conditions above, 158*
If I run 35-WOT for 10 minutes + I'll see 180* but it cools down quickly

Picked up a fuel gauge yesterday.
Old    Red (Redheadd)      Join Date: Apr 2014       08-18-2016, 1:53 PM Reply   
T not true a bad connection (loose) will be very sporadic. You installed a new amp? Boom! Check your perko bolts and battery cables for looseness.
Old    Red (Redheadd)      Join Date: Apr 2014       08-18-2016, 1:54 PM Reply   
If everything is tight and pressure is good. I'd check the iac valve next.
Old    Nacho (denverd1)      Join Date: May 2004       08-20-2016, 2:21 PM Reply   
Cap and rotor looks like chit. Dizzy went full retard for sure

Old    Nacho (denverd1)      Join Date: May 2004       08-20-2016, 2:26 PM Reply   
Gasket was torn and it only had 3 of 4 screws holding it down. Pretty sure I found my problem.
Guess moisture condensed in there when it cooled down.

Hard to tell in the pic, but every contact had 1, sometimes 2 green corrosion scales on it. Ordering a new one

I should replace rotor but couldn't get it come off. Mine might be rusted to the cam gear shaft with all the moisture I've got

Last edited by denverd1; 08-20-2016 at 2:29 PM.
Old    T (TTyler89)      Join Date: Jun 2015       08-20-2016, 3:01 PM Reply   
Take a pair of flat head screwdrivers and pop the rotor off. It's not the worst I've seen, but it does need replacing. Give it a shot and see if it fixes your problem.
Old    Todd (antoddio)      Join Date: Dec 2006       08-20-2016, 7:28 PM Reply   
I've seen a lot worse, but you should at least sandpaper the cap and rotor annually, especially if you leave the boat in moist conditions. Gasket being torn doesn't matter much and you might be able to find the 4th screw in the bilge. If you sandpaper them up a little, you can be back in business in 5 minutes. I'd replace it when you get the new one, but not every year. Just sandpaper it a little.

99.9% of Black Scorpion owners of the same design will have the same thing happen, so don't feel special.
Old    Nacho (denverd1)      Join Date: May 2004       08-20-2016, 11:09 PM Reply   
Nice. Like the sandpaper fix. Wanted to go out tomorrow so that helps. Cheers
Old    Todd (antoddio)      Join Date: Dec 2006       08-21-2016, 6:02 AM Reply   
Quote:
Originally Posted by denverd1 View Post
Nice. Like the sandpaper fix. Wanted to go out tomorrow so that helps. Cheers
Good deal. I've super glued that gasket before when it tore. Maybe you can use a twist tie for the other screw...although 3 might work for a bit. Good luck.
Old    Jack Henry (racer808)      Join Date: Jan 2013       08-21-2016, 6:09 AM Reply   
Sounds like a coil to me. I say that cause these are the exact same symptoms my wife's Nissan was having, would start run fine the act up. Was just one bad coil that would cause the cylinder to misfire
Old    Nacho (denverd1)      Join Date: May 2004       08-21-2016, 11:27 AM Reply   
Quote:
Originally Posted by racer808 View Post
Sounds like a coil to me. I say that cause these are the exact same symptoms my wife's Nissan was having, would start run fine the act up. Was just one bad coil that would cause the cylinder to misfire
a hot coil on the fritz is a close second IMO. Pics don't do justice to the moisture and corrosion in the cap. Good idea.I lose timing when it misses so ima check coil voltage too

Last edited by denverd1; 08-21-2016 at 11:29 AM.
Old    BLAIR BARHAM (jonblarc7)      Join Date: Jul 2006       08-22-2016, 11:32 AM Reply   
Called it first LOL

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