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kizdan67
10-21-2010, 10:59 AM
Hi everyone! New here.........

I have a '96 ProStar 205 LT1. At full throttle, or close to full throttle, I get a slight hesitation, like a skip, if you will. I have done a search of the forum, and from what I have read, seems to point to the fuel pump. Wanting to further confirm it, I had a mechanic come out with an OBDII tester, only to find that the connector didn't fit on the boat's. He was thinking that maybe it is OBDI. Anyways, he checked his OBDI tool when he got back to the shop, and said it was not the same connector.

Does anyone know if MasterCraft installs it's own unique connector? Or if there is an adapter that exists?

flipper
10-21-2010, 11:14 AM
You'll have to take it to a dealer to scan it. It's not an automotive computer.

chico
10-21-2010, 04:59 PM
That is a MEFI plug.(marine electronic fuel injection)You need to use a Techmate scanner or equivelent.You can also jumper the connector to read codes.

ahhudgins
10-21-2010, 06:36 PM
I bought a Codemate tester from Michiganmotorz.com (on ebay). Just plug it into the connector, slide the switch, turn the key on and count the led flashes. If you follow the link below, you can see that I rigged my Codemate and installed a "Check Engine" led on my dash. It's not the same as a diagnostic reader, but it will tell you if you have any stored codes. I may eventually spring for some diagnostic software.

http://www.mastercraft.com/teamtalk/showthread.php?t=36502&highlight=codemate

JLeuck64
10-21-2010, 07:13 PM
Hi everyone! New here.........

I have a '96 ProStar 205 LT1. At full throttle, or close to full throttle, I get a slight hesitation, like a skip, if you will. I have done a search of the forum, and from what I have read, seems to point to the fuel pump. Wanting to further confirm it, I had a mechanic come out with an OBDII tester, only to find that the connector didn't fit on the boat's. He was thinking that maybe it is OBDI. Anyways, he checked his OBDI tool when he got back to the shop, and said it was not the same connector.

Does anyone know if MasterCraft installs it's own unique connector? Or if there is an adapter that exists?

Sounds like you're describing a misfire to me... 14 year old plug wires I am assuming? An old set of spark plugs? One or the other or both could be a simple culprit.

kizdan67
10-22-2010, 09:20 AM
Sounds like you're describing a misfire to me... 14 year old plug wires I am assuming? An old set of spark plugs? One or the other or both could be a simple culprit.

I have about 535 hours on the boat, and was told by the dealer that I am not due to change the wires. I did just change the plugs and the gas filter.

I found some other threads on here regarding this issue, and they did point to the fuel pump.

I added some "Sea Foam" to the gas tank, and will run it this evening when I get home from work. I've heard good things about this product, hopefully it does the trick. No matter what, I am yanking the boat out of the water for the season tonight, and am bringing it to a dealer for winterization and storage tomorrow, and I will also have them check on this issue as well.

thatsmrmastercraft
10-22-2010, 09:28 AM
Sounds like you're describing a misfire to me... 14 year old plug wires I am assuming? An old set of spark plugs? One or the other or both could be a simple culprit.

I have about 535 hours on the boat, and was told by the dealer that I am not due to change the wires. I did just change the plugs and the gas filter.

Your dealer isn't helping you out on this one. JLeuck64 is giving you sound advice.

Did this problem happen before of after you changed the plugs?

JimN
10-22-2010, 09:35 AM
I have about 535 hours on the boat, and was told by the dealer that I am not due to change the wires. I did just change the plugs and the gas filter.

I found some other threads on here regarding this issue, and they did point to the fuel pump.

I added some "Sea Foam" to the gas tank, and will run it this evening when I get home from work. I've heard good things about this product, hopefully it does the trick. No matter what, I am yanking the boat out of the water for the season tonight, and am bringing it to a dealer for winterization and storage tomorrow, and I will also have them check on this issue as well.

It's a '95 model boat and it's not die for wires? I can't think of a single motor that wouldn't have been due for wires by now!

You can check for codes without a real scanner, using a paper clip. You can do a search hear for what to do- it has been posted several times and you'll see a lot of other good info along the way.

Step 1- always check fuel pressure first.
Step 2- check spark at all RPM. If you still have the OEM plug wires, I would be very suspect of their integrity at 15 years. Crossfire is a very real possibility.

What plugs did you put in? AC MR43LTS is the one this motor uses and if your parts supplier gave you NGK, they need to be the BPR6EFS and the gap is .045"

You don't have the in-tank pump but it is possible that the inlet screen on your pump is clogged. Usually, this issue is indicated by bogging at/near 3000RPM and improving if you accelerate slowly and smoothly through this range.

JLeuck64
10-22-2010, 09:52 AM
Did this problem happen before of after you changed the plugs?

Ahhhh... as Paul Harvey would say, and now you know the rest of the story!

Double check your plug wires to be sure they got back on the correct plugs. This is very easy to mix up and will cause a misfire that is MORE noticable at higher RPMs. I know this cuz I have done it ma self before ;)

JimN
10-22-2010, 09:57 AM
Ahhhh... as Paul Harvey would say, and now you know the rest of the story!

Double check your plug wires to be sure they got back on the correct plugs. This is very easy to mix up and will cause a misfire that is MORE noticable at higher RPMs. I know this cuz I have done it ma self before ;)

On this one, it's pretty hard to swap the plug wires because their length has less slack than the TBI and I think they may actually be numbered. If it was a standard distributor, I would definitely agree.

kizdan67
10-22-2010, 10:13 AM
It's a '95 model boat and it's not die for wires? I can't think of a single motor that wouldn't have been due for wires by now!

You can check for codes without a real scanner, using a paper clip. You can do a search hear for what to do- it has been posted several times and you'll see a lot of other good info along the way.

Step 1- always check fuel pressure first.
Step 2- check spark at all RPM. If you still have the OEM plug wires, I would be very suspect of their integrity at 15 years. Crossfire is a very real possibility.

What plugs did you put in? AC MR43LTS is the one this motor uses and if your parts supplier gave you NGK, they need to be the BPR6EFS and the gap is .045"

You don't have the in-tank pump but it is possible that the inlet screen on your pump is clogged. Usually, this issue is indicated by bogging at/near 3000RPM and improving if you accelerate slowly and smoothly through this range.

I would have to ask the mechanic what plugs he put in there. The issue existed before changing them, and still exists now.

The issue occurs at full throttle, or very close to full throttle only. It sort of skips for a split second, like a hesitation, but again, just for a second.

JimN
10-22-2010, 10:18 AM
I would have to ask the mechanic what plugs he put in there. The issue existed before changing them, and still exists now.

The issue occurs at full throttle, or very close to full throttle only. It sort of skips for a split second, like a hesitation, but again, just for a second.

If he tries to diagnose this on the trailer, it's gonna be a long haul. This needs to be checked on the water and it will be impossible to find a definitive cause unless it's by an incredible coincidence or he just checks everything.

I doubt it will throw a code but it may be picking up a knock if it has crossfire. Did you notice any knock or thump when this happens?

kizdan67
10-22-2010, 11:52 AM
If he tries to diagnose this on the trailer, it's gonna be a long haul. This needs to be checked on the water and it will be impossible to find a definitive cause unless it's by an incredible coincidence or he just checks everything.

I doubt it will throw a code but it may be picking up a knock if it has crossfire. Did you notice any knock or thump when this happens?

That was my intention when my guy came out with his tester that had the wrong connector. The place where I winterize will do a lake test for me. I can't say I noticed a knock or thump.

What is your impression/experience with "Sea Foam"?

kizdan67
10-25-2010, 10:08 AM
I yanked the boat out of the lake for the winter this past Friday. Before I did, I did 3 or 4 laps around the lake, much of it done at full throttle. No more hesitation. Could it be the Sea Foam?