Low TPS reading and injector questions?

[nola 521dvx]

Motor is an 04 225 HO FHLSRM. Just finished rebuild, rigged powerhead on the boat yesterday. TPS at idle stop is 0% as it should be, and starts to increase as the plates open, but at full throttle with plates ~all the way open (i've never been able to get them at 90 degrees) TPS reads only ~80%; before rebuild same position gave me ~92%. iF i move the TPS arm by hand it does go to 100%. Was getting dark so I could not look real close at the linkage but anything in particular i should be looking for? The roller sleeve is intact.

Second question - motor fired up and ran fine on hose, sounds real smooth. However, there is only a slight change in idle when I disable injector #5 (much less than when I disable the others). The injector clicks and the plug is new and good. Should I expect a similar change in running quality by disabling any injector?

Thanks as always.

[Danrude]

After a rebuild you have to do the timing adjustment and the sync and link per the service manual. Have you done that yet?

[nola 521dvx]

Yes, should have stated that - set mechanical timing and EMM timing (21 degrees BTDC). TPS just starts to register as the plates begin to open. Max voltage appears to be about 3.8 IIRC, think it shoudl be more like 4.7 (?). The WOT stop on the linkage is also tight so that doesn't seem to be the problem. Appreciate any insight you have. Maybe I just need to futz with the throttle cable some more?

[Danrude]

Are you using the software? You should be at .5v at idle and 4.75v at WOT, The % should go from 0 at idle to app 98% at WOT. Be sure to also check the voltage with the linkage disconnected to eliminate it.

[nola 521dvx]

Yes using software voltage is 0.4 or so at idle position, 3.8 wot. I've never been able to get the plates perpendicular, very close but not fully there. I'll try some more.

Any thoughts on the injector ?

[Danrude]

Is #5 the cylinder that blew.? It is hard to tell the difference in injectors at idle. The drop test should be performed on the water.

[triton21dan]

I have a motor just like that too i would like to know how to set the timing you spoke of on your motor i have the software for motor thats all i have to do to my motor before i crank it. I sure could use some how to do imformation on timing that motor. thanks dan

[nola 521dvx]

Suggest you get a factory service manual. in a nutshell, to set mechanical tdc you'll need a piston stop tool - I got one from Summit or Jegs or the like. With battery disconnected rotate flywheel by hand clockwise until the pointer is 20 degrees or so after TDC (see the numbers cast into the flywheel). Install tool into #1 plug hole (starboard top plug), rotate flywheel counterclockwise until piston hits the stop tool, record position of pointer. Leave tool in place, rotate flywheel by hand clockwise until piston hits tool, record position of pointer. TDC is exactly between these points - and the timing pointer needs to point to this central spot.

For electrical timing, fire up the motor, prime the oil system etc (see service manual for how), let motor warm up to operating temp. Using software, in settings menu (I think), put motor into timing mode - the screen will show you the target angle to reach, somewhere around 20 degrees before tdc. Using a timing light hooked up to plug wire #1, identify current angle on flywheel with engine running and use advance and retard buttons on laptop screen to get to the timing target angle. Once you are there, save the setting and you are done. If i can clarify anything just IM me, glad to help.

[nola 521dvx]

Thanks Danrude.

[Danrude]

Everything you neede to know is in the service manual. It would be the best investment you could make if you want to work on the motor yourself.

[triton21dan]

I tryed IM to you but no sure if i did it right i am new on this thing. But if you look at timing light degrees an degrees are not right just advance or retard on laptop looking at timing light and when timing light gets to 20 or 21 degrees hit save on laptop. Is that not right

[nola 521dvx]

That's right, when you have the motor running and enter timing mode (ignition timing tab in settings I think) the laptop gives you a target, e.g. 21 BTDC. Using your timing light look at actual timing on the motor and use the advance or retard buttons on the laptop screen to get the actual timing you see with the light to match the target number, in this case 21 BTDC. So, if the target is 21 BTDC but the motor is running at 19 BTDC, advance by 2 degrees using the laptop and re-check with your timing light to see motor is now actually running at 21 BTDC.

As we said above, the factory service manual is the best $50 you'll ever spend if you want to work on these yourself.

[triton21dan]

andy i did what you said to do on the timing. But the timing mark on my motor would keep moving around not stay still in one place is that normal or what. It is hooked up to #1 plug wire. I have timrd a car motor before and the mark will stay right there when turing the dist. Can you use a regular auto timing light to do this. I would like hear your opinion on this and what should i do .