02 rxdi troubleshooting performance issues ?

[ludikris]

My RXDI is merely 30 hrs into a new motor... it runs good normally.. not as good as it did before the rebuild .. maybe a few hundred rpm less on the top end but Im not complaining.

What I AM encountering now is a bog out down to 2000 rpms randomly... not alot but here and there. maint light came on once. full rpms return after I let off the throttle 100% and give it full right after...
Im gonna check voltage on the battery with my meter first but I was wondering what else I should check before I have a guy put it on the computer to read the code.

Thanks guys.

 

[ludikris]

anyone installed an inline fuel pressure guage ? anyone have experience with fuel injector testing etc.. ? a good spray vs a bad spray ?

r&d out of santa fe has a $45 inline fuel pressure gauge that Im thinking of getting...

 

[ludikris]

I've discovered the high pressure hose from the crank to the solenoid mounted on the wall above the fuel rail is hissing.. (leaking)

other than starting / fuel pressure / rave valve issues, what would cause a new motor to drop both cylinder pressure levels to under 100psi ?

 

[Dr Honda]

I've discovered the high pressure hose from the crank to the solenoid mounted on the wall above the fuel rail is hissing.. (leaking)

other than starting / fuel pressure / rave valve issues, what would cause a new motor to drop both cylinder pressure levels to under 100psi ?

Wrong oil??

If you are talking about compression... that engine is dead. BUT... running lean will burn the piston crowns... and since you have an air leak, it sounds like it was running lean.

Sorry I missed your post before. But do you have a warranty with that rebuild?

 

[ludikris]

the guy that did it is reputable so, Im gonna go speak with him once I replace that hose...
what part of the hose leaking vs the rebuild is to blame if the compression in both cylinders is at around 95 psi. ?

 

[ludikris]

I replaced the hose and the hissing went away... I used my car to start the ski but once I disconnected the cables, I noticed I was only getting 12.2-12.4 volts from the ski so, I deduce that the Voltage Regulator is toast.... ?

 

[brock1]

I replaced the hose and the hissing went away... I used my car to start the ski but once I disconnected the cables, I noticed I was only getting 12.2-12.4 volts from the ski so, I deduce that the Voltage Regulator is toast.... ?

Im sure youir mpem is toast too you are not supposed to boost the battery while it is installed you will be very lucky if you didnt fry it but it sounds like you did. As for the low compression if you ran it with that hose "hissing" you more than likely fried the new engine or if your luck maybe just the rings. You ran it too lean and that is what is causing the low compression. That line may be what caused you to have to rebuild it in the first place. Thats assuming that it blew up the first timeand that you didnt want to just replace the engine just because.

 

[ludikris]

What .. ? the MPEM is toast ? but it runs ok.. so I doubt that.. but I don't get over 12.3 volts when I put a meter on the installed battery while running the ski.... the charging system should be doing 13.5 volts right ?

why is boosting from another battery (car not running) bad for it ?

how do you properly boost a seadoo ?

I can still get the ski running fine.... the ski will turn over with the battery but wont start unless the "charged" battery is connected with cables...

if the fuel wasn't delivering correctly due to pressure loss in that hose.. does that mean there was too much oxygen and oil delivering and not enough gas ? I never thought too much oil would cause the engine to fail... not enough oil maybe.. but..

I clearly need some guidance here..

btw.. thanks for your help guys.. Im not a very experienced seadoo mechanic.. clearly:blush:

 

[brock1]

So it still runs then ok..... maybe your mpem is ok then you got lucky. There is a warning label on the hull that warns not to boost battery while installed it will fry your electrical components too much juice. But the oil is not your problem im pretty sure it waas the hose. Hissing means sucking air which means running to lean which means NEW TOP END. Did you check the compression before or after adding the extra oil. If you check it before you added more oil then your engine is done. If you added the oil then ran it for a while then tchecked compression you may still have done damage but im sure it all will boil down to the hose sucking air. Pull off the heads and see what it looks like i believe that engine has a rubber o ring for a head gasket so you wont need a new one if you arwe careful and its not melted.

 

[ludikris]

Im confused by the more oil thing... I said more oil because I didn't realize till after that the fuel and oil are equally injected into the fuel injector so when air pressure is lost, lean to me meant not enough gas but that there was still oil.. like I said.. Im a noob with DI's

I guess lean is just too much oxygen and not enough fuel (oil and gas).... that being said, the machine has probably worn the rings like u said and that's why my compression is way down but the motor still runs... for now anyway...

I need to boost the ski to test the VR now and Im not sure what is the "safe" way to do it.... there must be if the battery dies... but how ?

what readings should I expect and what else could they point to if I rev it up with a multimeter on the battery ?

 

[brock1]

Im confused by the more oil thing... I said more oil because I didn't realize till after that the fuel and oil are equally injected into the fuel injector so when air pressure is lost, lean to me meant not enough gas but that there was still oil.. like I said.. Im a noob with DI's

I guess lean is just too much oxygen and not enough fuel (oil and gas).... that being said, the machine has probably worn the rings like u said and that's why my compression is way down but the motor still runs... for now anyway...

I need to boost the ski to test the VR now and Im not sure what is the "safe" way to do it.... there must be if the battery dies... but how ?

what readings should I expect and what else could they point to if I rev it up with a multimeter on the battery ?

Correct lean means too much air, as for boosting it you can do it the best with a battery charger but DONT set the charger to BOOST only set it to CHARGE. I have also takeen out the batt and hooked jumper cables to the batt cables that is fine too. But like i said earlier you more than likely ruined your rings. I doubt that it was the adding to much oil that did it it was likely caused from the hose sucking air

 

[ludikris]

i was told differently but can you tell me if it's possible the cylinders equally lost compression solely by the rings wearing out due to the air line failure ?
I was told that the cylinders can lose compression backward through the line that failed...

 

[ludikris]

update.....

I changed the high pressure hose from the crank to the solenoid and the hissing is gone.. charged up the batter and the ski starts up fine now. Took it out on the water and it runs great...
I have yet to compression test it but I will do that soon to see where Im at...
It appears to me that the air line's hole really can cause the cylinder compression test to read incorrectly. I would not have had such performance if my compression was down at like 95psi... especially since both cylinders read the exact same ...