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  #41  
Old 07-30-2019, 04:39 PM
37tr3n5k 37tr3n5k is offline
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Boat: 2004 Maristar / 350 MCX
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That actually is the correct one. The screws hold on to the tabs. Mine is the exact same way. Mine is a 2004 MCX

This is a link to the one in my Boat:

https://www.amazon.com/09359409-Mani.../dp/B01C4O9K00
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  #42  
Old 08-13-2019, 02:53 PM
dom.xstar dom.xstar is offline
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Hello all,

as promised, I keep you posted about the whole story.
So after two weeks I got finally my new MAP sensor and now it works even better!
The acceleration is now really quick, compared before.
If its' the 100% of performance, I don't know.

Only sometime the engine has some backfire.
Not that much. And, at a dramatically decrease of the RPM's down to idle, sometime the engine is struggling a bit. After two or three seconds it rund continuously fine.

What could be the reason? Thinking about to ask my engineer to adjust the timing.

I ordered already new ignition cables as someone mentioned here.
Will see it helps.
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  #43  
Old 08-13-2019, 09:51 PM
37tr3n5k 37tr3n5k is offline
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Good news on the MAP sensor. Which one did you end up using? In regards to the backfiring, have you checked your iginition control module and ignition coil?

It is pretty unlikely your timing has slipped considering how difficult it is to access the distributor bolt holding it down.. Just my two cents.
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  #44  
Old 08-14-2019, 01:17 AM
dom.xstar dom.xstar is offline
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I took exactly the one you mentioned above with a picture.
First I asked my Mastercraft dealer but due to the price, I bought the "normal" one (not marine type).

Ignition control I checked last time.
How about the coil? I checked everything regarding the trouble shooting manual.

Backfire just occurs once a bit above the idle rpm's when I put the throttle on the table.
And only without switching into a gear.
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  #45  
Old 08-14-2019, 10:29 AM
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paintpollz paintpollz is offline
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Quote:
Originally Posted by dom.xstar View Post

Ignition control I checked last time.
How about the coil? I checked everything regarding the trouble shooting manual.
How did you check the ignition control module? I just bought a new one a couple days ago and plan on replacing this weekend to see if that fixes the issues. I'm only on an hunch from similar symptoms and recommendations from other TT'ers.

How many hours on your boat? You tried cleaning the MAF and it helped a little, but a brand new one helped a lot, correct? If that's the case I may just run down to the store and get a new MAF as well. I've got somewhere between 650-700 hours on this boat and the more I read about these issues the more I get the idea that these sensors really are wear items around this time.

Quote:
Originally Posted by dom.xstar View Post
Backfire just occurs once a bit above the idle rpm's when I put the throttle on the table.
And only without switching into a gear.
My backfire happens as soon soon as I put the throttle down to start out of holeshot , very infrequently I get a faint backfire pop. This just started when my poor acceleration issues started happening. I bet we have the same issue.
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  #46  
Old 08-14-2019, 02:09 PM
dom.xstar dom.xstar is offline
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It is also an idea to buy a new one.
Can you tell me which one I need?

And what do you mean with MAF sensor?
The MAP sensor I changed already. And in my case, the MAP sensor was not mounted correctly (was not tight).

Just one thing I want to change as well is the Knock Sensor!
I disconnected it and nothing changed.
So maybe it is already broken? Due to the fact nothing changed after disconnecting.

Can someone tell me which Knock sensor I have to buy? Not the Indmar one. Just a one it will also ok.
Would be really helpful.

Last edited by dom.xstar; 08-14-2019 at 02:19 PM.
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  #47  
Old 08-14-2019, 03:12 PM
37tr3n5k 37tr3n5k is offline
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re: knock sensor.. what year is your mcx? Some years have a knock sensor in place but dont use rhem for anything but a plug in the block. This is why Soder's knock sensor has no wires to it.
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  #48  
Old 08-14-2019, 07:38 PM
dom.xstar dom.xstar is offline
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My one is built up in 2004. See attached due to the engine.

The knock sensor is connected with a blue cable and connected to the ECU.
Regarding the wiring diagram everything is connected correctly.

And, can you tell me why my crank position sensor is not connected?
Is that normal?
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  #49  
Old 08-14-2019, 10:07 PM
37tr3n5k 37tr3n5k is offline
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My apologies for the above post- I meant to say Crank position sensor- not knock sensor.

In that regard, check out the description on this marine long block link:

https://www.perfprotech.com/new-gm-3...product/260508

"NOTE: It should be noted that the Vortec 5.7L longblocks are supplied WITHOUT a crank position sensor in the front timing chain cover. Therefore you must remove your existing crank position sensor and re-install it in the timing chain cover of the new longblock, otherwise the engine will leak oil out of this open hole. If your old engine did not utilize a crank position sensor you must purchase one to plug this hole as it requires this special o-ring type seal."

This could be the case on yours and what meant to refer to in my previous post. I would call Larry at Indmar and give him your engine serial number to see if yours had one.

901 353 9930
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  #50  
Old 08-15-2019, 08:15 AM
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paintpollz paintpollz is offline
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Quote:
Originally Posted by dom.xstar View Post
And what do you mean with MAF sensor?
My apologies, I meant to say MAP.

Quote:
Originally Posted by 37tr3n5k View Post
My apologies for the above post- I meant to say Crank position sensor- not knock sensor.
Based on these symptoms, wouldn't you recommend he start with the ICM?
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