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rem_pss308
06-19-2009, 10:17 PM
Well you guys have helped me in the past, and I hope you can on this one.

Had the boat out today about 4 hours. Had perfect pass on. It started out occasionally, then got worse.

Upon acceleration it would pause ( like shut down for a breif second, ) then go.
After the rider would fall. I would go to neutral, and the engine would tac out at 2000 rpms. it would very slowly go back to normal.
when idled up, it was making a weird noise.
It got to where it did it a few more times. and one time stayed at 3000 rpms. Some smoke was comeing from the exhaust that time.

The temp gauge was reading 130. it usually reads 160

The last time it did it, the boat would not plane out. it would shut down each time, so we idled back to the boat ramp.

The boat is a 1999 X-star with the LTR 330 HP


Anyone have any ideas?

Will the engine shut down if the temp sending unit is bad ? and show ing a low temp.

I will check the impeller, and trans cooler, and thermostat tomorrow. But the heat gauge showing the low temp is weird.

thanks in advance for any advice.

bigmac
06-19-2009, 10:40 PM
Don't know about the engine performance, but it does sound like your thermostat is stuck open. I'd replace it.

If the engine is too cold, it will run too rich. That could be the problem....at less than 140 degrees, your EFI will limit revs to 4200. Replacing the thermostat will tell you.

Footin
06-19-2009, 10:44 PM
I don't think its the thermostat, I'm thinkin IAC.

Jim should be along shortly.

cbryan70
06-19-2009, 10:54 PM
Jims old he is sleepy

rem_pss308
06-19-2009, 11:18 PM
I don't think its the thermostat, I'm thinkin IAC.

Jim should be along shortly.

What is an IAC ?

André
06-19-2009, 11:57 PM
What is an IAC ?

Idle Air Contol.

Jorski
06-20-2009, 12:10 AM
Did you try it with perfect pass off?

rem_pss308
06-20-2009, 12:18 AM
Did you try it with perfect pass off?

Yes, I forgot to mention that I did try it with perfect pass off, and it still did it.

bigmac
06-20-2009, 08:55 AM
IAC is good thought. But how does that make the engine run at 130 degrees?

rem_pss308
06-20-2009, 10:01 AM
IAC is good thought. But how does that make the engine run at 130 degrees?

Is the IAC something I would just replace. ( electronic ) or Need cleaning, and where might I find such an item on the engine?

Jorski
06-20-2009, 11:49 AM
The IAC shouldn't affect the temperature...you may have two problems.

rem_pss308
06-20-2009, 12:04 PM
Worked on it this morning.

Impeller is fine, trans cooler was a little stopped up. and thermostat looked ok, but I will replace it just to make sure.

Also ordered a new temp sensor from Skidim.

Took the boat out, and it still does the same thing.

Upon acceleration, just before getting on a plan. it bogs, and wont go any higher. it doesnt shut off, but when I go to neutral it is reving high. ( this was without perfect pass on )

I talked to the parts store and they told me a idle air control module is about $100.00 if we can match it.

So its not a part I want to buy on a whim.

They also said it shouldnt make the engine stall.

what do yall think of that.

WilliM1940
06-20-2009, 12:11 PM
Possible vacuum leak.

chico
06-20-2009, 01:54 PM
How old is the PP servo motor?Did you turn the black knob to take up any slack,the new ones have a self adjust feature.Make sure the servo cable isn`t binding and moves freely.

rem_pss308
06-20-2009, 02:22 PM
How old is the PP servo motor?Did you turn the black knob to take up any slack,the new ones have a self adjust feature.Make sure the servo cable isn`t binding and moves freely.

I dont know how old it is. but its doing it with perfect pass not on too.

chico
06-20-2009, 06:03 PM
The servo motor works to keep the throttle cable tight even when it is off.Check all the pp connectors on the servo and the module.

BriEOD
06-20-2009, 06:57 PM
Chico is right. Even when PP is turned off your throttle is interdependent on it.

rem_pss308
06-20-2009, 07:50 PM
How do I know if the servo is working properly?

I know one time yesterday it fell like there was no tension on the throttle cable. Like the cable had broken, but it straightened out after a few minutes.

These connections to check, are they on the thing with the dial. on the motor. or underneither the steering wheel?

chico
06-20-2009, 10:33 PM
With the key on the knob should be hard to turn,if it is loose try turning it clockwise to tighten,if this fails check for voltage to the servo motor.

chico
06-20-2009, 10:36 PM
If you have a ball joint for the throttle cable it`s easy to disconnect the servo cable and try running it without the PP.

rem_pss308
06-20-2009, 11:49 PM
If you have a ball joint for the throttle cable it`s easy to disconnect the servo cable and try running it without the PP.

I do think I have a ball joint. there is a thing on top of the motor that has the dial knob. and the cable from it hooks into what appears to be a ball joint below the throttle body linkage.

I will look in the morning.


I really appretiate all the responses Im getting. this is something I know nothing about. I understand motors but this is really getting to me.

chico
06-21-2009, 08:33 AM
That is the servo motor,with the key on the knob should be hard to turn and probably has power,if it is loose you have a problem with the servo.

rem_pss308
06-21-2009, 12:09 PM
That is the servo motor,with the key on the knob should be hard to turn and probably has power,if it is loose you have a problem with the servo.

Checked all connections, at servo motor, and under the dash.
they all seem tight.
When the key turns on, the servo motor runs and tightens the wire going to the throttle. and it stays tight.

I do not have the ball joint.

going to take it to the river to test again.

rem_pss308
06-21-2009, 04:08 PM
Im thinking maybe BIGMAC has the answer. It is still running cold. 120 degrees while driving, and if idleing would barely reach 140. If I kept the RPMs below 3000 it worked fine. if I got over 3500 it would stall, then idle high for a moment.

will have a new thermostat after Monday. maybe that will fix it.

rem_pss308
06-26-2009, 11:07 PM
It looks like the thermostat was the problem.
I put the new one in, and it is running fine.
So I guess when it does run cooler than supposed. the computer does tell it to shut down.

( Something new to me )

hope this helps someone else.
thanks for the opinion BIGMAC

bigmac
06-27-2009, 07:15 AM
Glad you're up and running.

BriEOD
06-27-2009, 08:31 AM
Good to know.

rem_pss308
06-28-2009, 09:13 PM
Yep been a few days, and its still running great.
It does go to about 170 sometimes, but mostly runs at 160

But no bogging. runs like a champ.

Computers are complicated. wish there was a manual that lists these symptoms.

has any one used the blinky tester on theres. is it worth $90.00

or would it be better to get a batter one that gives the code numbers.

any suggestions on which one?

Cloaked
06-28-2009, 09:30 PM
A buddy of mine had the same issue. Ended up being that the trannsmission cooler / strainer was clogged up causing the overheating, thus putting the engine in limp mode.