2001 sx225txrz. Intermittent surge between 3300 and 4000 rpm. Will go up and down on its own. Holds nice and steady above and below those speeds. Filters nice and clean. Have cleaned O2 sensor but did not test it. Could the O2 be the culprit here ? Would a cheap replacement work as well ? Like ngk/ntk 21006
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OX 66 occasional surge
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Originally posted by scofflaw View Post2001 sx225txrz. Intermittent surge between 3300 and 4000 rpm. Will go up and down on its own. Holds nice and steady above and below those speeds. Filters nice and clean. Have cleaned O2 sensor but did not test it. Could the O2 be the culprit here ? Would a cheap replacement work as well ? Like ngk/ntk 21006
I would Google any numbers seen on the original sensor and see what comes up.
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Here's what Rodbolt said about testing O2 sensors on another thread.Not sure if this is applicable to your engine or not. Good information though.
over time Yamaha found the flame test not very accurate.
that's why there are running tests to properly observe O2 sensor voltage.
one is at idle gear case submerged and engine at operating temp.
with the air box removed and the engine at normal temp cover the #1 cyl idle air bypass hole with a finger.
O2 sensor voltage should rapidly climb above about .8V.
remove the finger and it should drop to about .3V then start scaling between about .35 and about .65 V.
the other is a constant run at about 3000-3500 RPM and watching the O2 sensor voltage.
should scale in the .35V range.
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So to recap this...It is possible a bad O2 can cause these symptom in this 3300 to 4000 rpm range ? Don't own that winky blinky device yet, but since my idle rpm is 700 can I assume that I have no bad sensors ?
This engine never goes into a higher cold idle mode if that is any clue or not.
Thanks for lookingLast edited by scofflaw; 05-07-2017, 12:43 PM.
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Originally posted by 99yam40 View PostI would think if the motor thought it was warmed up already it would not idle high for the cold fast idle.
Check the temp senders that talk to the ECU
New plugs, CS
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Update....have confirmed that the O2 voltage values are out of spec. in my problem area. Seeing this is an old boat and motor, I'm attempting to cheap my way out with an O2 sensor that costs less than 10% of what Yamaha wants.
Will update again when installed and running
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