Loosing RPM 5.7 EFI
#11
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#12
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Thread Starter
Im pretty sure its not the EST, and it is the thunderbolt style distributor
#13
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Est dist
tbolt dist
tbolt dist
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articfriends (07-20-2022)
#14
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From 99-2000 the MEFI 3 came out with TB5 Dizzy
Sterndrive is 8* and Inboard is 10*
Put a advance timing light on it and see it your getting full advance
What Octane fuel are you using?
Using a Techmate you may not see that a code 44 shows up. If it is showing up then it will retard the timing
Sterndrive is 8* and Inboard is 10*
Put a advance timing light on it and see it your getting full advance
What Octane fuel are you using?
Using a Techmate you may not see that a code 44 shows up. If it is showing up then it will retard the timing
#16
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Thread Starter
From 99-2000 the MEFI 3 came out with TB5 Dizzy
Sterndrive is 8* and Inboard is 10*
Put a advance timing light on it and see it your getting full advance
What Octane fuel are you using?
Using a Techmate you may not see that a code 44 shows up. If it is showing up then it will retard the timing
Sterndrive is 8* and Inboard is 10*
Put a advance timing light on it and see it your getting full advance
What Octane fuel are you using?
Using a Techmate you may not see that a code 44 shows up. If it is showing up then it will retard the timing
It did have about 30-40 gallons of fuel that sat in it for a little over a year while the engine was getting rebuilt, but since then another 30-40 gallons of marina rec fuel has been added
Last edited by Ryanw10; 07-20-2022 at 07:15 PM.
#17
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Couple other things that I should mention:
-Last time on the water I remember feeling that the starboard riser was hot to touch where the port one was cool. Thinking back on that now I remember pulling an exhaust shutter out of the exhaust passage in the transom assembly when putting the outdrive back on. Im wondering if the other exhaust shutter is lodged somewhere in there and blocking flow in the starboard side.
-While the engine was getting rebuilt I also replaced the lower on the bravo 3. Im 99% sure I confirmed it was the same ratio as the old one but I have made mistakes before...
-I still have yet to get an actual fuel pressure reading because I can not come up with the correct fitting. Techmate said around 12 gph under full throttle
-Last time on the water I remember feeling that the starboard riser was hot to touch where the port one was cool. Thinking back on that now I remember pulling an exhaust shutter out of the exhaust passage in the transom assembly when putting the outdrive back on. Im wondering if the other exhaust shutter is lodged somewhere in there and blocking flow in the starboard side.
-While the engine was getting rebuilt I also replaced the lower on the bravo 3. Im 99% sure I confirmed it was the same ratio as the old one but I have made mistakes before...
-I still have yet to get an actual fuel pressure reading because I can not come up with the correct fitting. Techmate said around 12 gph under full throttle
#18
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Can you drill thru, then tap for say 1/8” npt fuel psi gauge , the plug in the ‘return’ side of tbi ?
#3 here:
https://www.mercruiserparts.com/bam/...31629/2340/130
(some places list in stock, if you eish to try it on a spare part)
#3 here:
https://www.mercruiserparts.com/bam/...31629/2340/130
(some places list in stock, if you eish to try it on a spare part)
#19
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The Techmate will read accurate, disregard the timing light
Lets get more into the ratio
You can remove the fuel pressure sensor and install gauge there
The low oil and fuel pressure may be an indication that the 5V reference voltage may be low. It can be low by one of the sensors drawing to much current. What does the Techmate show the voltage is?
You didn't happen to replace the injectors?
replaced the lower on the bravo 3. Im 99% sure I confirmed it was the same ratio as the old one
You can remove the fuel pressure sensor and install gauge there
The low oil and fuel pressure may be an indication that the 5V reference voltage may be low. It can be low by one of the sensors drawing to much current. What does the Techmate show the voltage is?
You didn't happen to replace the injectors?
Last edited by AllDodge; 07-21-2022 at 08:07 AM.
#20
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Thread Starter
The Techmate will read accurate, disregard the timing light
Lets get more into the ratio
You can remove the fuel pressure sensor and install gauge there
The low oil and fuel pressure may be an indication that the 5V reference voltage may be low. It can be low by one of the sensors drawing to much current. What does the Techmate show the voltage is?
You didn't happen to replace the injectors?
Lets get more into the ratio
You can remove the fuel pressure sensor and install gauge there
The low oil and fuel pressure may be an indication that the 5V reference voltage may be low. It can be low by one of the sensors drawing to much current. What does the Techmate show the voltage is?
You didn't happen to replace the injectors?
The old lower was corroded beyond repair. I got a used lower off ebay and would have spun the input shaft 1 turn and then counted how many times the propshaft rotated and make sure both old lower and new lower are the same.
I will try and locate the fuel pressure sensor today and see if my gage fits.
The low oil and fuel pressure warnings have not been present the last 2 times I have hooked up the scanner. All im getting right now is "general warning #1" I will hook the scanner back up to see what voltage I am getting.
I did not replace the injectors. I did take a very short video with the hatch up, and air cleaner off to watch the injectors under load. The port injector seemed to be flowing a little less, but hard to say from a phone camera.