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damo79 reacted to Scott06's post in the thread Mercruiser 4.5l low vacuum, WOT 4350 and higher fuel consumption with Like.

good catch yes vacuum at idle should be higher than throttle open near WOT should be less than 3" would think

Today at 1:29 PM
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damo79 reacted to nola mike's post in the thread Mercruiser 4.5l low vacuum, WOT 4350 and higher fuel consumption with Like.

Your manifold pressure is going the wrong way. At idle was the vacuum steady? You said you replaced TMAP, is that the MAP sensor? That...

Today at 1:29 PM
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damo79 reacted to alldodge's post in the thread Mercruiser 4.5l low vacuum, WOT 4350 and higher fuel consumption with Like.

Check fuel pressure at the rail. Ive found most marine motors manifold pressures are a tad lower than autos Its list each cylinder but...

Today at 1:29 PM
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damo79 reacted to Chris1956's post in the thread Mercruiser 4.5l low vacuum, WOT 4350 and higher fuel consumption with Like.

Gee, the data shows some misfires. Is that normal?

Today at 1:29 PM
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damo79 replied to the thread Mercruiser 4.5l low vacuum, WOT 4350 and higher fuel consumption.

Fuel pressure steady at 45psi - checked under load while on plane.

Today at 1:27 PM
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damo79 replied to the thread Mercruiser 4.5l low vacuum, WOT 4350 and higher fuel consumption.

What do you mean wrong way? TMAP it's integrated MAP with temperature sensor. New sensor readings in Diacom verified with gauge and...

Today at 1:26 PM
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damo79 replied to the thread Mercruiser 4.5l low vacuum, WOT 4350 and higher fuel consumption.

It was during startup. If diacom connected after warmup no misfires.

Today at 1:20 PM
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damo79 reacted to Scott Danforth's post in the thread Mercruiser 4.5l low vacuum, WOT 4350 and higher fuel consumption with Like.

did you change props? this says the motor is giving it nearly all it has.

Today at 9:36 AM
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damo79 reacted to Scott06's post in the thread Mercruiser 4.5l low vacuum, WOT 4350 and higher fuel consumption with Like.

Not sure if @muc may be able to weigh in.

Today at 9:36 AM
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damo79 replied to the thread Mercruiser 4.5l low vacuum, WOT 4350 and higher fuel consumption.

No and tried two different props didn't see much difference. I noticed that intake manifold pressure is too low at idle. It's only...

Today at 9:35 AM
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damo79 replied to the thread Mercruiser 4.5l low vacuum, WOT 4350 and higher fuel consumption.

It's 2016 MPI engine. No distributor. Ignition coils controlled by PCM112 module

Today at 7:44 AM
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damo79 replied to the thread Mercruiser 4.5l low vacuum, WOT 4350 and higher fuel consumption.

Today at 7:42 AM
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damo79 posted the thread Mercruiser 4.5l low vacuum, WOT 4350 and higher fuel consumption in Mercury MerCruiser Sterndrives & Engines.

Hi everyone. I'm trying to figure out what's wrong with my engine. Noticed it won't rev above 4300 and fuel consumption is 30% higher...
Today at 2:38 AM