MX 6.2L MPI

[tsouthard91]

Hey guys,

I've got a 6.2L that I think needs some tuning.

When I start the boat (no matter if its a cold start or warm start), the boat kinda coughs to life.

Also, the idle speed is very slow along with the idle RPM. It almost sounds like it has a performance cam in it. Sometimes I think its going to die. It will also act like it wants to stall out when going from forward to neutral or neutral to reverse.

Any thoughts on some immediate fixes that come to mind? I am not overly mechanic savvy, but with direction I can do most things.

TIA

[Big Block Power]

Well. Take the air cleaner off open the throttle all the way open. Engine off of course. Take carb cleaner on a rag and clean the throttle plate and that whole area. You may have a lazy iac motor. Easy to change 2 screws. Also merc puts a tiny filter in a passage going to the iac motor that could be sucked in or coming apart and plugging the passage.

After watching this vid it may be normal.

https://youtu.be/cRHZotplPJ4

Nauti's have one.

[tsouthard91]

Thanks BBP.

After watching the video, seems very similar to mine.

I'll also take at that part.

Appreciate it!

[Islander208]

Screenshot_20180707-133157_Gallery.jpg

You may also want to change the fuel filter. Mine is on the starboard side. If you open your engine hatch look down to the left. Maybe run some Seafoam in the gas tank as well. I was going to replace mine before the season started, but still in a box in the garage.

About four years ago when my idle control valve went bad, boat would die when idling. I had "warning beeps" when it went out. Funny thing, when researching the Mercruiser part, it was the same as a 1990-something Town&Country (I think, it was a long time ago).

Picture of the fuel filter

[Big Block Power]

Interesting. I have not seen a online fuel filter in a long time on any of my boats.
Yes there are a couple of diff style iac. One is off of a Ford and one is a gm style. Never saw the chry. One.
Ive had a few fail on me and I always have a spare on the boat.

[tsouthard91]

Screenshot_20180707-133157_Gallery.jpgYou may also want to change the fuel filter. Mine is on the starboard side. If you open your engine hatch look down to the left. Maybe run some Seafoam in the gas tank as well. I was going to replace mine before the season started, but still in a box in the garage.

About four years ago when my idle control valve went bad, boat would die when idling. I had "warning beeps" when it went out. Funny thing, when researching the Mercruiser part, it was the same as a 1990-something Town&Country (I think, it was a long time ago).

Picture of the fuel filter

Thank you!

I will certainly look at this!!

[Islander208]

20180710_212847.jpg

Screenshot_20180707-133157_Gallery.jpgYou may also want to change the fuel filter. Mine is on the starboard side. If you open your engine hatch look down to the left. Maybe run some Seafoam in the gas tank as well. I was going to replace mine before the season started, but still in a box in the garage.

About four years ago when my idle control valve went bad, boat would die when idling. I had "warning beeps" when it went out. Funny thing, when researching the Mercruiser part, it was the same as a 1990-something Town&Country (I think, it was a long time ago).

Picture of the fuel filter

Thank you!

I will certainly look at this!!

[Big Block Power]

I would think that is just a AC Delco filter. Does it have a AC part number on it.

[Islander208]

These were the only #'s on the filter. Not sure what the other #'s are

Screenshot_20180711-064000_Gallery.jpg

[tsouthard91]

This is perfect.

Appreciate it guys!

[Big Block Power]

These were the only #'s on the filter. Not sure what the other #'s areScreenshot_20180711-064000_Gallery.jpg

Nope they don't have the ac delco number anymore. I know they used to when I changed it on my donzi.
Good find though.

[cmattj]

These were the only #'s on the filter. Not sure what the other #'s areScreenshot_20180711-064000_Gallery.jpg

Nope they don't have the ac delco number anymore. I know they used to when I changed it on my donzi.
Good find though.

Yep that is a AC Delco GF series filter. Even K&N made them.

[ajcampen]

These were the only #'s on the filter. Not sure what the other #'s areScreenshot_20180711-064000_Gallery.jpg

Nope they don't have the ac delco number anymore. I know they used to when I changed it on my donzi.
Good find though.

Yep that is a AC Delco GF series filter. Even K&N made them.

Matt any idea who’s filter the cool fuel module uses? That definey could be an aftermarket part

[cmattj]

Nope they don't have the ac delco number anymore. I know they used to when I changed it on my donzi.
Good find though.

Yep that is a AC Delco GF series filter. Even K&N made them.

Matt any idea who’s filter the cool fuel module uses? That definey could be an aftermarket part

Not sure AJ. Just the Merc or Quicksilver brand would be fine. Unlike the in-line gf delco with brass adapters and clamps ( funny how things get adapted by rigging), those are more proprietary to the cool fuel systems .

[Islander208]

Screenshot_20180713-084210_Gallery.jpg

Screenshot_20180713-084202_Gallery.jpg

Here are some pics of the fuel line to filter to fuel pump.