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Thanks. I forgot about the TPS. I will check that this PM. Good call...
Just to make sure.... this motor only has two Thermostats... correct?

Yes, oil in the Motor tank is full. I will redo the pump. I changed the two Thermostats on the port and starboard heads. Where is the third? Thanks!!

I do not have a pressure gauge on the motor. I am working to get one. I suspect the water pump is good as it was rebuilt less than 3 months ago.
The battery voltage is good. I am not overspending...

2004 175 DFI Model 1175D83CY - Serial 0T972330

Moving at 1800 RPM no issues... after a while if I push the throttle up to speed up, I get the alarm. Back to neutral for a few seconds and then...

Thank you Don for the comments. I will reach out to Rhonda at European Marine.
One more question. Which would be the correct manual and do you know if it is available to the public?

2004 175 DFI Model 1175D83CY - Serial 0T972330 System Smartcarft ECM

Currently, I only have the Tachometer.
Supposedly, this is a SmartCarft motor but the wiring harness from the motor to the...

Update and conclusion..... for those interested.

After I completely checked the air and fuel regulators and tracker valve, the issue was solved by doing three things.
Replaced the rings in the...

Thank you EuropeanAm, I sent you a PM.

Thank you for the comments. Extremely helpful...
I did get the new Boyesen reeds. Whish I had waited for your comments. The motor runs quite well.... On the muffs that is. Not tested on the...

While I wait for parts, I thought I would provide an update.
The air compressor rings have been replaced and it is pumping great. Solid pressure.
I did find out that the air regulator is letting...

Thanks for the feed back.
Air compressor piston and cylinder walls are in good shape. So is the connecting rod and bearings.
The reeds are also good. Checked the stand open specification of 0.020...

Ok, this is where I am as of today.
I decided to test my theory about the air pressure being low. So, I connected my shop's air compressor and set it to 80PSI. Then disconnected the air compressor...

Thank you. The belt is new. And I checked the tensioner and also seems to be strong and the base where the spring engages is also good. Maybe the rough idle makes the belts bounce more than...

Ok, I got to take the readings as suggested.
On the readings below, keep in mind the needle is bouncing a bit so it is a best estimate on where the needle bottoms.
I am also testing out of the...

Ok, will do it that way. Thanks !!!

Ok, I got gauges now. Glycerin filled and two of them so I can take the measurements at the same time for fuel and air. 70 bucks instead of 100s....
I still plan to test the fuel pumps themselves....

I will have to sort the gauges out. Looking in the internet, that is a lot of money for a rarely used tool....

While I figure that one out.....
I do have one question. I want to verify the HP...

Thank you EuropeanAM !! Always helpful.
I will check the seal at the HP pump.
Sadly, I only have one gauge.
In the test you mention. Am I looking for the pressures to maintain first and...

2004 175 DFI Model 1175D83CY - Serial 0T972330 System Smartcarft ECM
I found water in the fuel tank and proceeded to clean the entire system.
Cleaned the tank
Cleaned the lines
Cleaned the vapor...

The 3 mechanics that try to fix my problem kept changing the same items. Impeller, thermostats, poppet valve rebuild, different spring for the poppet, gaskets, impeller housing, everything..... but...

Tuner gasket - Part number 27-78246-1 For those that will need it.
I have also ordered gaskets 27-183076 and 27-991764 as I expect they will need to be replaced.
The SS bolts and lock washer I got...

No idea if the bolt was there from factory or not. Talking to one of the mechanics that tried to work on it, he said that it was from Mercury. Not sure about that. In any case, if you are having a...

2004 175 DFI Model 1175D83CY - Serial 0T972330 System Smartcarft ECM
Issue: Motor overheating when RPM passed 1200, guardian setting off alarm, back down to neutral and alarm would turn off. All ok...