Jump to content

Welcome to TheMalibuCrew!

As a guest, you are welcome to poke around and view the majority of the content that we have to offer, but in order to post, search, contact members, and get full use out of the website you will need to Register for an Account. It's free and it's easy, so don't hesitate to join the TheMalibuCrew Family today!

Check Engine at 1000 - 1500 rpm


fireworkperson

Recommended Posts

Hi,

I have a 2006 Malibu 23 LSV with the 383 Hammerhead (just about 300 hours). Just recently the check engine alarm comes on when the engine hits about 1000 - 1500 rpm. There are no other symptoms. I read the code using diacom and the following error comes up:

SPN 65701 FMI 31General Warning 1 Not Available

I've searched the diagnostic manual and it seems the code is triggered by low voltage from a sensor. I checked all the sensors that I can think of and the voltages are within 4.8 - 5.2 V. All the fluids have been replaces as well as spark plugs, the fuel filter, and the air filter.

I'll explain what happens:

Boat is at rest, throttle up and the alarm sounds at (usually) 1200 rpm or so. Silence the alarm by hitting the "E" button. Alarm will come back after the ~5 minute timer or so. The engine doesn't go into limp mode or anything. Absolutely no other noticeable changes occur. The coolant temp and oil pressure remain in normal ranges. The alarm does not ever come on if the engine remains below ~1200 rpm.

Any input or experience would be of great value. Thanks in advance!

Edited by fireworkperson
add details
Link to comment
5 hours ago, fireworkperson said:

Hi,

I have a 2006 Malibu 23 LSV with the 383 Hammerhead (just about 300 hours). Just recently the check engine alarm comes on when the engine hits about 1000 - 1500 rpm. There are no other symptoms. I read the code using diacom and the following error comes up:

SPN 65701 FMI 31General Warning 1 Not Available

I've searched the diagnostic manual and it seems the code is triggered by low voltage from a sensor. I checked all the sensors that I can think of and the voltages are within 4.8 - 5.2 V. All the fluids have been replaces as well as spark plugs, the fuel filter, and the air filter.

I'll explain what happens:

Boat is at rest, throttle up and the alarm sounds at (usually) 1200 rpm or so. Silence the alarm by hitting the "E" button. Alarm will come back after the ~5 minute timer or so. The engine doesn't go into limp mode or anything. Absolutely no other noticeable changes occur. The coolant temp and oil pressure remain in normal ranges. The alarm does not ever come on if the engine remains below ~1200 rpm.

Any input or experience would be of great value. Thanks in advance!

From Larry at Indmar:

 

Link to comment

Hi everyone,

Thanks so much for your suggestions and help. I have two knock sensors on the drain plugs for the engine. I checked both connections, which were secure, but the knock sensors were corroded/oxidized and the knock sensor mounts were also extremely oxidized and corroded in spots. Perhaps it's having an effect.

Unfortunately, after cleaning out the air filter (which was doused in engine oil), I'm having trouble starting the engine, so it's going to be a bit longer before I can further diagnose the check engine.

Thanks again for your help and I'll check back in once it gets fixed so that this post can hopefully help someone else in the future!

Link to comment
  • 7 months later...

Well, turns out that a lot more was wrong with the boat. I was hoping that the check engine light was something simple but, according to my boat mechanic, it's worse than expected. Apparently, one of the stringers has failed. The failure of the stringer has caused the engine to shift to an angle. The shift has caused a number of problems, including the error code listed above (I think?). Anyways, thanks for all of your help to those who had responded to my first inquiry; your help was greatly appreciated!

I'll continue to update this thread if I find anything new - I really hope that this can help others!

Link to comment
8 hours ago, fireworkperson said:

...one of the stringers has failed.

Huh?  I'd bet bamaboy's bitcoin that your stringer hasn't failed. 

A loose engine mount maybe.  Are you the original owner of the boat? 

Link to comment
formulaben
1 hour ago, justgary said:

Huh?  I'd bet bamaboy's bitcoin that your stringer hasn't failed. 

A loose engine mount maybe.  Are you the original owner of the boat? 

Agreed, sounds very suspect.

Link to comment

Thanks, all. I am not the original owner. I just updated this post since we just got it back from our boat dealer/mechanic who has had it since October 2020. We’ll be taking it to another dealer for a second opinion - it’s just a 4 hour drive since we live in the rural Midwest.
 

I made another post regarding the alleged stringer problem. justgary, I believe you replied to that post - thanks!

Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...