• This site contains eBay affiliate links for which Sea-Doo Forum may be compensated.

951 DI problems after engine rebuild / need help

Status
Not open for further replies.

sagent

New Member
My 2001 GTX di has had maintenance light issues since I bought it. After going through 2 faulty new rectifiers from OSD I finally bought a used 4 tec rectifier off ebay and installed it last summer. After installing the 4 tec rectifier, info center would blink "maintenance" and red light would flash after plugging key in 10 times , then seemed to run fine. Last august I threw a connecting rod and rebuilt the motor over the winter.

Finally got the ski in the water a few weeks ago and as soon as I got on the throttle, info center started going crazy blinking " maintenance " with red light flashing. Ski runs like crap, misfiring and wont go above 30mph. The clock on the info center will stay at 12:00 and compass will constantly read south even days after shutting the motor down and removing key or alll characters on display will be lit up.

If I remove the negative cable from the battery, there is no maintenance or red light when plugging key in and starting machine if left at idle. It only acts up when you get on the throttle

The other strange thing is the hour meter on info center has gone from 150 hours to 0.1 hours to 555.5 hours since I have been running it this year. The machine has 143.7 hours on it which is correct and my candoo pro reads same from mpem

According to my candoo pro, the only codes which have been activated since rebuild are following:

P0335 wrong pattern sensed on encoder
P0325 knock sensor circuit malfunction

When I rebuilt the engine I took the mag flywheel off with the encoder ring as one piece so I dont know why the encoder ring would be an issue

When i go to the min / max page on the candoo pro, it appears the voltage has gone up to about 19 volts at some point likely because of the rectifier issues.

Any ideas on where to go from here ?
 
What is your battery voltage now running? I would check all connections for corrosion and make sure all grounds are good. My guess there you MPEM might have been cooked with the 19 volts...
 
Battery voltage appears ok. That's what I was thinking about mpem. Discovered last night my head gasket is leaking water into combustion chamber. Would that cause the misfire ?
 
you might want to remove the drive shaft & pump to see if it does the same thing. The cps/encoder and knock sensor can go a little coo-coo if there are strong vibrations in the engine. I rebuilt a GTX 2 years ago that started & idled perfect but was tripping the CPS code above 3K In this engine, the crank bearings were bad, IF you have a new/rebuild crank installed that should not be the case as long as the runout was in spec. Did you happen to check that when you put it together? Also, pull the plugs and slowly hand rotate the engine from the PTO & make sure its very smooth & no noises from within.
 
Crank and pistons are new wsm. I did hand crank the engine after I put it together and seems to rotate smothly
 
Whey you replaced the crank, did you align it with the counter balancer? That would cause vibration.
 
Well, replaced fuel filter and had head shaved flat. Machine will now accelerate up to 60 on the speedometer. Voltage appears to hold from 13.8-14.1 volts when revving machine in the garage. I still have misfiring and maintenance light starting as soon as machine hits about 4500 rpm and at the same time, the info center goes crazy, the clock will reset to 12:00. Seems to start acting normal when I return to idle speed / low rpm and maintenance light goes out. Any ideas ? Try new mpem ?
 
Put your meter on ac volt and measure the charging voltage. I wonder if you are getting too much ripple from the regulator.
 
One other thing I forgot to mention, I had my laptop / candoo pro on the Machine and was on engine monitor function. I revved the motor to check voltage and the candoo pro software froze up. Also the minutes at which the candoo read codes went from 8622 to like over 55000. I read somewhere this is caused by high voltage working it way back thru ground ?
 
Status
Not open for further replies.
Back
Top