225 efi sluggish takoff...sometimes

[bottledgt]

This motor sometimes wont plane out occasionally. It will hit about2900 rpm and sit there until it gains enough speed to get over about3200 then it takes off great from there. No missing or anything. Other times, it goes straight to3500 and takes right off. The tuner holes were all plugged up so i took everything apart and cleaned and drilled all that out. It runs a lot better across the board now, but still does the slow take off at random. Runs and starts great otherwise. Powerhead is new along with injectors flowed and cleaned,etc. also noticed sometimes when idling,if you raise throtle slowly up to about2500,then slowly increase from there,it will slow down and seem to lose power at a certain throttle position like its loading up or something. Then you have to give it more to get past the dead spot. Ive went through the tps but its perfectly smooth reading from idle to wot. Its a 99 engine. Only thing left i can come up with is map sensor?

[EuropeanAM]

Possibly MAP sensor... fuel pressure regulator (check fuel pressure under acceleration)- OR there may be a problem with the throttle cam/roller synchronization.

Also- make sure:

-Idle relief port (back of engine) is at least 1" above the water's surface (bottom of opening). This MAY require beginning holeshot with trim at a LEVEL TRIM position... and then tucking trim down as you begin to take off.

-If you're running a SMALL hub prop... make certain you've installed a "blowout ring" (which will allow PVS openings to function as intended... allowing you to dial-in those openings for combination that results in good hole-shot).

What prop are you running- and with what size PVS openings?

[bottledgt]

26 fury. All holes open with 3 extra 5/16 holes for more help. When it takes off normally its about3500 rpm which is about spot on.

[mdtritn21]

Mr Dee over on the setups and props board had extra PVS holes drilled in his to help venting but he says you can only drill two holes in it because of the struts. Mark Croxton agreed with him about only being able to drill two holes but it does help..

[bottledgt]

Yeah, the strut is close on one, but it does fit.but that isnt problem it seems. At the time ,i didnt know the idle relief ports were plugged. After i drilled it, it gained me a couple hundred rpm. And after drilling the idle reliefs back out, itmade a good difference as well. Its liveable now, but still not quite right and random, so those were somewhat the problem, but not all of it apparently

[EuropeanAM]

What reeds are you running? Fuel pressure been confirmed/monitored WHILE this is occurring?

[bottledgt]

At the moment they are stock reeds. I planned on switching to tdrs when i got it all running correctly. Just havent done it yet. Fuel pressure was checked in the shop when i got it running, but i havent ran a on the water test yet. I need to do that. BUT as good as it runs after planing and wot, and by the look of the plugs, i suspect it will be fine on pressure.

[bottledgt]

My gauge is leaking ,so i have to get a new one. But i had it out yesterday andpaid close attention to it. Seemed like at beginning of the day,after warmup, it would hit 3500-3700 real quick and go. But after it got good and warmed up is when it acted up. If you try to run about 10 mph and increase slowly from there it just doesnt want to go. Even to the point of a slight surge. Seems that if the boat isnt on plane and under a load is when it occurs. If its on plane,you can back off throttle under 3000, then take off without a hiccup at all. Seems like a lean problem to me. Tps is at .95 last i checked,but will setting it at 1.0 even be enough change to richen it up if thats the case?

[EuropeanAM]

Increasing the TPS to 1.0 would definitely increase the amount of fuel delivered (especially at low throttle settings/idle).

You may also want to check the final filter (which is located under the hose-flange of the pressure regulator).

[bottledgt]

Increasing the TPS to 1.0 would definitely increase the amount of fuel delivered (especially at low throttle settings/idle).

You may also want to check the final filter (which is located under the hose-flange of the pressure regulator).

good call don, but that was already cleaned before the engine went together. Lol. Ill bump up the tps for now if my pressure check turns out good next time out.

[EuropeanAM]

Just for the grins-n-giggles... wouldn't be a bad idea to check that final filter again. Might be clean as a whistle.... and then again, it might NOT be, also.

[bottledgt]

Just for the grins-n-giggles... wouldn't be a bad idea to check that final filter again. Might be clean as a whistle.... and then again, it might NOT be, also.

Yeah,it could be. Ill pull it just for a check, but it did this the very first time off the trailer and every since then, so i cant see that being it, but it could be

[bottledgt]

Went out today. Waited till it acted up to check fuel press. 38 lbs across the board no matter what. No fluctuation whatsoever. All while it Was doing what it does. Took until about mid day before it acted up. Tps was raised to 1.0 also. That didnt seem to help much other than my speeds are a couple mph faster at certain rpms i normally run at. It definately didnt act up near as much as it always does though. Its got me puzzled since it runs so well otherwise. No hiccups at all except this one thing. Im still wondering if the tps isnt acting up sometimes after its warm. Thats sure what it feel like. I cant really see it being fuel since it only does this at approx 3000 rpm. Once past that it flies. And other times, it just runs like it should through the whole range

[EuropeanAM]

Remove the hose from the MAP sensor, and from the intake. Blow it out with compressed air... and ensure that the hose has no splits, cracks or pin-holes.

COULD be a small amount of oil built up in the hose (or fitting at the intake)....

[bottledgt]

I will try that out. It has to be something silly like that.

[BushBanger]

sometimes on 2 cycles. if the oil ratio is too high, makes them bog

[bottledgt]

yeah, i dont really think that is part of my issue.

[bottledgt]

been a long winter, but my injectors get back from don today. turns out, two were flooding pretty bad. hopefully this takes care of the problem!

[bottledgt]

after fire up this afternoon in the drive, the 2000 rpm vibration i could notice before is not there anymore. going for water test in a couple days!

[EuropeanAM]

Good luck... be sure to report back.

Make sure TPS is properly set... and pre-mix supplied to the system (until oil injection is completely purged of air... of course- if you've removed oil injection, this is a "mute point" as you would premix ALWAYS).