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Monsoon misfire


C.Hill

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I have a 2010 malibu vlx with the monsoon 350 engine and i have had nothing but problems. I have constant misfire codes and constant visits back to the dealer. I am out of patience and scared that this problem may never get resolved. Also the dealer had the boat for 5 months at one time working with indmaar to redo some "plumbing." Is anybody else dealing with this problem?

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had my monsoon since 05 never had a problem, have several friends with monsoon all running strong. The monsoon is pretty basic tech that has been around for 15+ yrs should not be that hard to diagnose what is going on

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strange i have an 08 and it is perfect till today ! just got a new boat with monsoon again as its the most trouble free engine.

hope they fix it soon for you !

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Had 7 monsoons I can think of. Zero issues that engine is as reliable as any marine engine I've ever been around. Can you elaborate on your issues?

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Thank you very much for the response, this is my first time on a forum and quickly seeing the benefit. I had little trouble until about 125 hrs. I started getting misfire codes on various cylinders and was told that it was not a significant problem because i couldn't actually feel the engine misfiring. After a month i took the boat to OC md  and after an hour ride stopped the boat for about an hour, when i started it up and went to get on plane i felt a power reduction and checked the oil and had burnt a couple of quarts of oil. I took the boat back to the dealer and they had worked with indmaar to fix the problem becuase some other malibu's had similar problem including traces of water in the cylinders. I got the boat back in april and put 3 hours on the boat and got another misfire code. Took it back to them and the couldn't find a misfire. I got it back and another couple engine hrs. Later i got another misfire code  

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I have an 07 monsoon(has 470hr now) and at 250hr I developed a misfire. It didn't happen all the time so I started with new fuel, fuel filter and plugs. That didn't fix the problem and finally decided to check out the cap and rotor. I figured since it only had 250hr the cap and rotor should be fine, but I was wrong. The cap was burnt on about 3 contacts, so I changed those 2 things and it's been trouble free ever since.

I would think a dealer would check these basics first, but you never know. The cap is kinda of a pain to get at since it's under the manifold. I found it way easier to just remove the manifold to get at it.

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Ok thanks alot i will give the cap and rotor a shot and change the plugs to see if it helps. After that im gonna start calling malibu for a new engine.

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  • 4 years later...
4 hours ago, kerpluxal said:

Has this issue ever been resolved? if so, what was it? I just had a new crate engine installed and now experiencing the same issue :(

Long shot here, but I've been surfing a bunch of GM forums for info on the intake manifold gasket I have to replace (at 250 hours).  Apparently many of the 5.7 engines have problems with bad gasket sealant application in the "crotch" between the gaskets - and with bad or quickly deteriorating gaskets.  I just got the replacements and they are plastic with rubber "beads" as a sealing mechanism and they do not seat flat - rather they seat at an angle.  Water leaking into a cylinder could cause your problems.  If you run the boat out of the water (on a cooling water supply of course) do you notice any steam?  Spark plugs all look the same?  Anyway, your issue may be mechanical, so look beyond the electrical.  If you can identify the cylinder via the codes check out that plug.

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17 hours ago, minnmarker said:

Long shot here, but I've been surfing a bunch of GM forums for info on the intake manifold gasket I have to replace (at 250 hours).  Apparently many of the 5.7 engines have problems with bad gasket sealant application in the "crotch" between the gaskets - and with bad or quickly deteriorating gaskets.  I just got the replacements and they are plastic with rubber "beads" as a sealing mechanism and they do not seat flat - rather they seat at an angle.  Water leaking into a cylinder could cause your problems.  If you run the boat out of the water (on a cooling water supply of course) do you notice any steam?  Spark plugs all look the same?  Anyway, your issue may be mechanical, so look beyond the electrical.  If you can identify the cylinder via the codes check out that plug.

Well, looks like I jumped the gun and assumed that same code was being thrown... according to dealer the miss fire did not show this time... it was the drive by wire unit... so will see if this $1,000.00 repair fixes it :(

Thank you for your response @minnmarker on a 2 year old post :cheers:

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