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Search took 0.00 seconds. Search: Posts Made By: mmwjr

Forum: Engines

04-14-2018, 11:31 AM

Replies: 24

Loss of engine power; Mercruiser 5.0l MPI/Bravo 3

Views: 17,799

Posted By mmwjr

Not sure I understand how a leaking exhaust...

Not sure I understand how a leaking exhaust manifold gasket would cause a loss of power.

Forum: Engines

09-09-2017, 09:42 PM

Replies: 24

Loss of engine power; Mercruiser 5.0l MPI/Bravo 3

Views: 17,799

Posted By mmwjr

Don S welcome aboard What year is your boat?...

Don S welcome aboard

What year is your boat? Is it MPI or throttle body injected?

So you loose power at higher rpms? Where does it fall off, rpm?

Forum: Engines

08-25-2017, 12:29 PM

Replies: 24

Loss of engine power; Mercruiser 5.0l MPI/Bravo 3

Views: 17,799

Posted By mmwjr

Dirty injectors usually start showing signs as a...

Dirty injectors usually start showing signs as a rough running engine and not loss of rpm.

Now that you found the engine manual there is a troubleshooting guide in it you may want to look at.

Forum: Engines

08-25-2017, 02:40 AM

Replies: 24

Loss of engine power; Mercruiser 5.0l MPI/Bravo 3

Views: 17,799

Posted By mmwjr

180 is rather high, 150 is more normal and all...

180 is rather high, 150 is more normal and all cylinders should be within 10% of each other.

Never heard overheating causing rings or valves to leak. It can warp heads or block throwing tolerances...

Forum: Engines

08-25-2017, 12:17 AM

Replies: 24

Loss of engine power; Mercruiser 5.0l MPI/Bravo 3

Views: 17,799

Posted By mmwjr

What is the compression of the other cylinders? ...

What is the compression of the other cylinders?

130 is low but not too low for the power loss you mention.

Being that cylinders 2 and 4 are low my guess is the head gasket is leaking between...

Forum: Engines

07-05-2017, 10:49 AM

Replies: 24

Loss of engine power; Mercruiser 5.0l MPI/Bravo 3

Views: 17,799

Posted By mmwjr

For a raw water cooled engine 150 is the correct...

For a raw water cooled engine 150 is the correct t-stat, I don't think this is contributing to the issue. There are several temp sensors on the EFI, one for the gauge, one for the alarm and another...

Forum: Engines

07-04-2017, 08:49 PM

Replies: 24

Loss of engine power; Mercruiser 5.0l MPI/Bravo 3

Views: 17,799

Posted By mmwjr

Another thing could be a bad temp sensor having...

Another thing could be a bad temp sensor having the engine think it always cold and keeping the mixture rich which intern is fowling the plugs.

All these sensors is why a scan is required.

Forum: Engines

07-04-2017, 08:36 PM

Replies: 24

Loss of engine power; Mercruiser 5.0l MPI/Bravo 3

Views: 17,799

Posted By mmwjr

I would expect around 10 gph running at 3200 rpm....

I would expect around 10 gph running at 3200 rpm. At 1500 rpm it should be a lot better say 4 gph. Could be leaky injectors, what do the spark plugs look like?

Forum: Engines

07-03-2017, 11:04 AM

Replies: 24

Loss of engine power; Mercruiser 5.0l MPI/Bravo 3

Views: 17,799

Posted By mmwjr

I would check the fuel pressure as the pump may...

I would check the fuel pressure as the pump may be dieing, however this is counter to increase fuel use. I would look into having the engine scanned for fault codes.

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