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2006 Indmar 325 MPI EST Distributor timing issues

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Stretch72cj

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Ive been searching all of goolge and havent got a solid answer or path for troubleshooting my issues. Ive installed a new distributor and have been trying to figure out the base timing procedure. Ive tried the shunt at the distributor and the engine will not run with it installed. With the oem harness connected it will run. Ive tried jumping pins a and b and have gotten it to run which seems decent at 10 deg. The indmar procedure if im reading it correctly is asking for it to be set at 50 deg. But thats with the software so not sure whats what and where I should be setting it at and if the jumping pins a and b is even correct. Alot of different opinions and procedures on the internet so trying to do this correctly. Thanks in advance.
 
The 2006 Indmar operator's manual states the timing adjustment only applies to their carburetor engines.

You have MPI in the title but also state you have the EST distributor. Most MPI enignes in that time frame have the 'enhanced ignition'.

Can you post a picture of the distributor, clearly showing the cap?
 
This is the document I am referring too. I do not currently have a picture of the setup.
I have the EST style distributor shown in the procedure. It does have EFI. This is the MEFI 3 or 4 I believe. Hard to determine what actual years they went to the HVS distributor. Appears to be later 2000's with the MEFI 5. I need to inspect the ECM to confirm that still as well as if my application has a crank sensor or not.
 
I'd say the attachment is a good start but doesn't appear comprehensive.

Agreed, you need to know what you have before you can proceed. the MEFI ECU should have a GM part number on the "back" of it - usually all you have to do is unbolt it and you can write down the number...a quick www search will tell you what version you have.

If you need to do the cam-retard procedure, you will need a scan tool to get it right. My guess is this is what you have.

if it is the regular EST w/o the crank sensor variant, I'd suggest setting the timing to max advance, at 3000RPM without the timing shunt.

"model years", on boats, are NOT applied consistently, so use with caution. Most all OEMs (engines) use their serial numbers to track the configuration.
 
The rinda tools are the industry standard...

You can read the codes with a jumper wire, an LED, and the proper resistor...thats on the internet, too...
 
makomark said:
The rinda tools are the industry standard...

You can read the codes with a jumper wire, an LED, and the proper resistor...thats on the internet, too...
Click to expand...
Just to share there’s also a neat way to check the MEFI ECM’s using a multimeter…,
 
I believe I got it handled. Did not have a crank position sensor so I jumped the obd terminals with the rinda codemate and set base timing to 10deg BTDC. Took it out and runs good. Small hiccup every once in a while though left to be determined.
 
I haven't used it but have read those that have are mostly happy with it....its a 'read only' version so, if that fits your needs, go for it.
 
The Rinda products are the industry standards....most OEMs have adopted them and use them in their factory training schools...
 
Stretch72cj said:
I believe I got it handled. Did not have a crank position sensor so I jumped the obd terminals with the rinda codemate and set base timing to 10deg BTDC. Took it out and runs good. Small hiccup every once in a while though left to be determined.
Click to expand...
Show your engine, its model and serial number (should be on a sticker, on the oil pan).

MEFI 3 & 4 were long gone by 2006 at Indmar, AFAIK.

Why did you need to replace the distributor?
 
This is the only picture I have of the boat currently. It’s raining today so I can get more if yould like. I went through and did a standard tune up and when taking the rotor off the reluctor was pretty loose. It received new plugs, wires, distributor, fuel filter and all fluids changed. Put a new impeller in it as well and
new belts.
Boat Engine.jpg
 
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