1 - The role of the Oxygen sensor The o2 sensor (oxygen sensor) is located within the exhaust system, upstream of the catalytic converter. They now are telling me a need to upgrade my batteries from class 24 to 27 or 31, but don't know if that will fix problem. I use Ring Free 90% of the time, but then with so many no wake lakes I idle 95% of the time. it could be a bad wire or connection somewhere in the circuit. Its worth upgrading. had a bad oxygen sensor on one of my 225 OX66 engines. OX66 O2 sensor, TPS tests...good or bad? Have you run any Ring Free thru the motor yet? the crank position sensor tells the ECU where it is at. sir I saw that on the video as well. Genuine Yamaha Parts. Have to do a lot of idling on most of the lakes I fish. Guess I'll have to read up and check the o2 sensor. I have 2-1998 225 yamaha ox66 one has been missing not going over 3500 rpm then after awhile it goes away and it happens again. the coolant temp sensor gives info on block temp. My 1998 [Yamaha] Ox-66 225-HP starts up right and idles smoothly, but when [my Yamaha Ox-66 225-HP is] at slow speeds it runs a little rough. The motor would jump from 2200 to 3300 rpms without moving the throttle. The VMax model is in the high-performance model line. The symptoms you describe could also be from failing low pressure fuel pumps (you have three of them). My plugs were carboned up pretty bad, so I changed them. You're welcome, let me know how you make out. Manufacturer: Yamaha. lower v = lower fuel flow. Do you have access to a diagnostic indicator lamp tool for that engine? Removing and cleaning the O2 sensor is pretty easy. If it was a bad O2 sensor it would run bad all the time. Also was very hard to start. Email: support@simyamaha.com. International: +1.888.231.2392. We will follow up. We'll get it fixed. Charles. Watch later. I'm getting 5600 WOT and then 5000 the next two times and then back to 5600. replaced bad O2 sensor on OX66. Once the sensor is loose, unscrew it and let it soak in a container of gasoline for at least 8 hours. Use Yamaha combustion chamber cleaner on the O2 sensor. I have read many conflicting reports re: whether you can splice connectors on sensors...some say yes, some say no..I … Does it still pull the same WOT rpm? Yamaha Ox66 200 Service Manual; Ox66 250hp Service Manual; 2001 Yamaha 225 Ox66 Service Manual; Thus far I have replaced all 3 LP fuel pumps, swapped the O2 sensor with the other motor, cleaned the VST filter and replaced all filters. They are best replaced every season on a boat with a lot of use & every other season with limited use. Have you checked compression and done a cylinderleak down test? Another way to prevent getting this page in the future is to use Privacy Pass. Once I cleaned and bench tested the o2 sensor and reinstalled, the motor ran great and started right up for about 3 … Toll-free: +1.888.231.2392. Removing and cleaning the O2 sensor is pretty easy. I then tested the TPS with the #1 throttle valve disconnected asper the Yammie manual. - - Hard starting Yamaha 250 OX66 ... and I would check the TPS voltage as well. I have always admired the Yamaha OX66 engine because it seems to be one of the only outboard engines with fuel injection that used a closed loop feedback system and an oxygen sensor in the exhaust. Thank you VERY much. OX66 O2 Sensor … Part: SENSOR. Andy, thank … Ive swaped coils fuel injectors made sure fuel pumps were good batery wa … read more. Their is a test harness and procedure to test O2 sensor operation once you are sure it's clean. definately sounds like fuel supply. It also seems like there is a lot of … The initial TPS voltage was .47 volts. after cleaning VST, fuel filters and changing O2 sensor (all good things to do anyway as they are recommended on a regular service interval), if it does not fix the problem, check voltage to electric fuel pump. View Profile View Forum Posts Private Message Member Join Date Mar 2006 Location Austin Posts 860. OEM Part Number: 65L-8592A-01-00. (check manual for correct wire colors. ChampionDon. I use ringfree as the solvent but many use carb cleaner Make sure that only the sensor tube is immersed in the cleaner and not the whole sensor. Before you can clean an oxygen sensor, you have to remove it from the exhaust manifold. my Yamaha 2002 ox66 250 lost 10kts of speed.just changed o2 sensor and there is still a problem.motor is very well maintained(vst,plugs,and filters changed when they should be) also I lost this speed … read more Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. Topic: 1998 Yamaha 225-HP Ox66 O 2 Sensor Failure Symptoms: Richard March: posted 06-13-2008 02:47 PM ET (US) [This article has been moved to the REPAIRS/MODS discussion from another discussion area--jimh.] Customer reply replied 5 months ago. Performance & security by Cloudflare, Please complete the security check to access. the O2 sensor is for fuel trim. Cloudflare Ray ID: 63a809d28c49501e Had a lot of carbon built up on the o2 sensor. Its role is to inform the ECU of the oxygen content of the burned gases that result from combustion. Heat the tip with a propane flame while measuring the voltage on the sensor leads. When you are done soaking (if needed) spray it clean … O2 sensor checkcleaning? the TPS gives information on throttle angle. Spark plug color? Try pumping the bulb when it happens. Then I bought a upgraded joint that the carbon builds up on the outside of the tube instead of the inside. The o2 sensor helps to ensure that the amount of fuel injected into the cylinders for the air-fuel ratio is at an ideal level. If I manually advance the … Ask An Experts. I cleaned out the breather tube with no change in operation. yamaha ox66 o2 sensor 20 Descriptions: An oxygen sensor (or lambda sensor) is an electronic device that measures the proportion of oxygen (O2) in the gas or liquid being analyzed. It's cheap and the Seafoam bottle says it's O2 sensor safe. Please enable Cookies and reload the page. They're about $50 each, plus labor. Ask Your Own Boat Question. They also clog. Testing the O2 sensor is pretty easy. Also check the low and high pressure fuel filters. Andy. They now are telling me a need to upgrade my batteries from class 24 to 27 or 31, but don't know if that will fix problem. If the low pressure fuel pumps have not been replaced in a while, replace them. Try the. It will ruin the sensor. MOST of the time, it's the dogbone that's clogged and dirty with minimal "dirt" on the sensor itself. Also, when you pull the O2 sensor off the block, there is a barbell or dogbone looking "joint" that needs to be pulled and cleaned out. Also make sure you clean the transfer tube for the O2 sensor real well too, it will just pull out once you remove the O2 sensor. What were the symptoms? the SM has all the voltage specs for testing each and every sensor. When you are done soaking (if needed) spray it clean with electronic parts cleaner. I am thinking the new O2 sensor may be the problem. Ask The Experts anything on SIM Yamaha. Gonna do a few PM type things this week and want to get this done as well. Features: Help determine if the air-fuel ratio of a combustion engine is rich or lean. Gear & Gadgets on the Texas Fishing and Outdoors Show, Powered by UBB.threads™ PHP Forum Software 7.7.3. The engine's Electronic Control Unit (ECU) adjusts the fuel injectors "on time" to compensate for any changes in the exhaust mixture. The only problem I have had was a O2 sensor went bad and fuel pump diagrams tear. Its on a 250hp motor. I adjusted and sync'd the throttle valves. Spray the combustion chamber clear into a clean glass jar until there is enough to soak the sensor to the threads. Yamaha's OX66 outboard is the only two-stroke to use an oxygen-density sensor in its fuel4njection system. I have found the combustion chamber cleaner does a better job on the O2 sensor than ring free as recommended by Bass and Walleye boats in their O2 sensor cleaning article. There is a transfer tube Yamaha calls a joint that sends the gasses from the exhaust to the o2 sensor. Jump to page: Results 1 to 20 of 29 Thread Tools. They generally need replacing about every 500 hours, I was told. I have found the combustion chamber cleaner does a better job on the O2 sensor than ring free as recommended by Bass and Walleye boats in their O2 sensor cleaning article. I do used to do mine every 2 years and it was almost clogged. To make this easier, spray the sensor with WD40 and let it sit for 15 minutes. Heed tips on how, tools needed and what cleaning solvent, for how long etc. Yamaha Motors; OX66 O2 Sensor Removal; Thread: OX66 O2 Sensor Removal. Use Yamaha combustion chamber cleaner on the O2 sensor. • Do not use acetylene or overheat the sensor. I wouldn't fool with the O2 sensor too much myself, though, other than the Seafoam treatment and perhaps to take a small drill bit to get out any carbon still in the tube that feeds the sensor… I notice occasionally it will lage a few extra seconds before I get on plane and everyone says its the O2 sensor needing cleaning or replaced. Yamaha OX66 250 O2 sensor carbon build up. Marine Mechanic: Ted G., Rigger, Diagnostician replied 5 months ago. • Yamaha OX66 250 O2 sensor carbon build up - YouTube. the intake air sensor also gives oxygen density info. the specs for voltage from idle to WOT are readily available on the web. with you via email within 24-48 hours. Show Printable Version; Email this Page… Subscribe to this Thread… 08-12-2010, 08:35 PM #1. Steve. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. O2 sensor was dirty and breather tube was completely clogged. You may need to download version 2.0 now from the Chrome Web Store. Yes, this is a common problem. Don't use any other cleaners. Marine Mechanic. I adjusted the TPS to .50 volts. the map sensor gives information on oxygen density. Yamaha s225txrx. As it warms up, the voltage should increase. if anyone has any. © 2021 SIM YAMAHA. BluefinTuna: 06-01-2006 09:47 AM: Re: Hard starting Yamaha 250 OX66 . Anyone ever have oxygen sensor problems with the OX66? I had read about using an NGK/NTK 21006 and splicing the connectors in...the cost of that o2 sensor is $40 as opposed to $300...same specs - 4 wire, 0-1v, same size as OEM etc. Washington Island, WI 54246. Thanks. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. Wierd. Rough idle, excessive gas and oil consumption and losing rpm at WOT are all common symptoms, but other things can cause this also. Cleaning it is easy also but you need to follow the guidelines. Page 1 of 2 1 2 Last. Spray the combustion chamber clear into a clean glass jar until there is enough to soak the sensor to the threads. Your IP: 51.68.153.78
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