5.7 TBI perfomance issue on a rebuild 14.5x17 prop

[zero lash]

Re: 5.7 TBI perfomance issue on a rebuild 14.5x17 prop

Yes that's what I did. I gave the mercruiser tech my engine number and they told me the correct way to set timing. I set it 8 degrees and at 1200 rpm. It was off about 12 degrees. Think that might make a diff. We will see what happens. When I take it out

 

[Bondo]

Re: 5.7 TBI perfomance issue on a rebuild 14.5x17 prop

Yes that's what I did. I gave the mercruiser tech my engine number and they told me the correct way to set timing. I set it 8 degrees and at 1200 rpm. It was off about 12 degrees. Think that might make a diff. We will see what happens. When I take it out

Ayuh,.... I guess I've been doin' it Wrong all these years,....

Timing is set, at Idle...

 

[Tail_Gunner]

Re: 5.7 TBI perfomance issue on a rebuild 14.5x17 prop

I borrowed a tool to set it into service mode. But first I got the boat 2 operating temperature. Plugged in the tool. Plugged in the timing gun. Manually set The throttle to 1800 RPM. Then I set the timing to 10 degrees Before top dead center. It took a few times because it kept stalling In RP M's kept dropping Or rising.

Actually its like use a jumper wire and connect the white / black wire to the black wire inside the connector..If it is a mefi 1 you turn it to 1500 then adjust. As Don stated you need to post the serial number and the code on your ecu.


Along with that if you post the pitch of the prop along with gearing on the leg that would illuminate a few things..4500 rpm and 32 mph does not sound right. the std v8 gearing is 1.5 assuming that and a 17p prop turning 4500 at 32 is 33% slip

 

[zero lash]

Re: 5.7 TBI perfomance issue on a rebuild 14.5x17 prop

That's just what mercruiser told me. Here is the eng. 0l2012580. MCM 5.7 not sure where the ECU number is.

 

[Don S]

Re: 5.7 TBI perfomance issue on a rebuild 14.5x17 prop

That's just what mercruiser told me.

Was that Mercruiser directly, or just a Mercruiser dealer? Makes a huge difference.

Here is the eng. 0l2012580. MCM 5.7 not sure where the ECU number is.

Check your serial number again, you have way too many numbers, and make sure it's the engine serial number and not the outdrive serial number.

 

[zero lash]

Re: 5.7 TBI perfomance issue on a rebuild 14.5x17 prop

Direct mercruiser then engine number I have is 0L012580. Is there another place it should be other than my warranty card and on the motor itself? Thanks for everyones help btw

 

[Don S]

Re: 5.7 TBI perfomance issue on a rebuild 14.5x17 prop

You just had the wrong number, 0L012580 compared to 0l2012580 you posted earlier. Makes a big difference when you take that first 2 out.

 

[zero lash]

Re: 5.7 TBI perfomance issue on a rebuild 14.5x17 prop

Trying to type on a smart phone for a guy 6'4 260 ain't easy. What was the diagnosis wrong timing procedure?

 

[Don S]

Re: 5.7 TBI perfomance issue on a rebuild 14.5x17 prop

I don't know, but I do know which manual the procedure is in.
Here is a link to the manual. http://www.4shared.com/office/JOT2vS2W/24__GM_V8_50-57_98-01.html? You will find the correct procedure in it, I'm just trying to do about 4 things at a time right now and haven't looked it up yet.

 

[zero lash]

Re: 5.7 TBI perfomance issue on a rebuild 14.5x17 prop

Yea that's the procedure I used. Thanks

 

[TilliamWe]

Re: 5.7 TBI perfomance issue on a rebuild 14.5x17 prop

I fear your hull is waterlogged.

 

[zero lash]

Re: 5.7 TBI perfomance issue on a rebuild 14.5x17 prop

And how do I know and how do I get it out. I planto to putthink it onthat's a scale5 tomorrow. would of thought since searay installed the bildge and water could possibly get in the holes even though they were caulked there would be a way for the water to get out.

 

[TilliamWe]

Re: 5.7 TBI perfomance issue on a rebuild 14.5x17 prop

No, boats aren't supposed to get water in them. Strange, but the worst thing you can do to a fiberglas boat is put it in the water. Gelcoat actually absorbs water. yes, you read that right, it absorbs water.
And the water that came out of your screw holes probably didn't get in through those screw holes. It probably got in from somewhere else when the boat was floode and full of water.

You quite possibly have a HUGE project on your hands.

 

[zero lash]

Re: 5.7 TBI perfomance issue on a rebuild 14.5x17 prop

Thanks it will get it on a scale I guess and see what it weighs and move on from there.

 

[Tail_Gunner]

Re: 5.7 TBI perfomance issue on a rebuild 14.5x17 prop

Yea that's the procedure I used. Thanks

Connect timing light to number 1 spark plug wire.
2. Start engine and run at 1300 rpm until it reaches normal operating temperature.
3. Stop engine and connect the scan tool or timing tool to the DLC connector on the EFI/
MPI wiring harness.
4. Start engine, allow rpm to stabilize.
NOTE: MEFI-1 models only, manually adjust remote control throttle lever to get 1200 engine
rpm.
NOTE: MEFI-2 and MEFI-3 models only, ECM will automatically adjust engine rpm to
approximately 1200 rpm when put in the service mode on a scan tool or when using the
timing tool.
5. Check ignition timing. If incorrect, rotate the distributor until timing is correct. Torque
clamping screw to 18 lb-ft (25 Nm).
6. Recheck ignition timing.
7. Disconnect scan tool or timing tool from DLC connector.
8. If required, return remote control throttle lever to idle position and shut off engine.
9. Restart engine, increase rpm to 1300 then return to idle position slowly. Ensure that
engine returns to idle rpm. Readjust throttle cable, if required.
10. Shut engine off.
Spark Plugs

So you did not use a shunt....So I disconnected the timing tool ...what is a timing tool? Below is a shunt

And the EFI timing tool...The shunt connects to the dist and the timing tool connects to the ecm or data link

 

[zero lash]

Re: 5.7 TBI perfomance issue on a rebuild 14.5x17 prop

Yes I did use the shunt.

 

[Don S]

Re: 5.7 TBI perfomance issue on a rebuild 14.5x17 prop

Yes I did use the shunt.

You DO NOT use the shunt when setting the timing on the TBI engine, you have to use the timing tool on the DLC. (a paper clip also works for this.) this puts the ECM into service mode so the timing can be set.
Using the shunt, you just bypass the ECM completely, then when you hook up the ECM again, everything is way off.