1999 150 opti check engine light

**jestor** · 07-04-2013, 04:43 PM

Hello
Can I get some info my motor has been working flawless touch wood until the other day when you go start the engine not all the time the check engine light comes on then shut the motor off start it no code the closest merc dealer is like 7 hours where i live any ideas for a quick fix.Seems to run good except for the code.Thanks

**slofisher** · 07-05-2013, 10:56 AM

What is the code?

**jestor** · 07-05-2013, 08:01 PM

Its just the check engine light on the warning system comes on.

**slofisher** · 07-05-2013, 08:27 PM

No beeps or horn or buzzer sound? No other light up like oil, temp, etc?

**jestor** · 07-06-2013, 06:48 AM

Just the check engine light that is the only light and the warning horn

**jestor** · 07-06-2013, 06:52 AM

just before the check engine light came on for the first time when I shifted to nuetrul the motor reved up motor way more than usual for a couple of seconds

**slofisher** · 07-06-2013, 09:08 AM

I am more familiar with the year 2000 Otimax 150 which I believe is pretty much the same. Your problem could have something to do with low oil or air in the oil system. Have you filled or opened either of the oil tanks recently? Is the horn sound a single beep or mutiple beeps? Or water in fuel. Or throttle sensor failure. You sure none of the other lights on the moniter display are lighting? Do you have the manual for your engine? How about a Seloc repair manual? Without any of these manuals it would be hard to repair and maintain your engine without making a 7 hour trip.

**jestor** · 07-06-2013, 06:44 PM

Thanks I am taking it in on Monday for a scan.Thanks

**slofisher** · 07-07-2013, 06:18 PM

I was looking in my manual today. Concerning warning system signals the only problem it notes that causes the horn and the check engine light to signal deals with the throttle sensor. All other problems causes other signals to light up as well. Point being your problem is most likely due to a malfunctioning throttle sensor.

**jestor** · 07-07-2013, 10:08 PM

Will let you know tomorrow but that what I was thinking

**jestor** · 07-08-2013, 12:31 PM

It was tps1 and tps2 was giving me the codes

**slofisher** · 07-08-2013, 01:13 PM

Easy Fix. Shouldn't cost to much either. I did not know there are two TPS, I am only aware of one. Do you know where the 2nd one is located?

**jestor** · 07-08-2013, 04:11 PM

Yes the two are stacked together with a lever sandwiched in the middle $450CDN

**jestor** · 07-13-2013, 07:42 PM

Ok i got the two sensors and installed them tried to start the engine it was very hard starting and the check engine light come on.WTF.Took everthing apart maybe installed something wrong put it back together same thing.Installed the new one one the inside old sensor on the the outside still check engine light come on.So i installed the old sensor on the inside and new one one the outside works fine.So is it possible that i could get a screwed up new sensor or am i missing something.Please any info would help

**slofisher** · 07-14-2013, 12:41 PM

As far as I know the TPS is only 1 part. I am not aware of a TPS 1 and TPS2. You can buy a new TPS online for about $173. (See the Crowley Marine website. Part #31 Calls it a TPI) http://www.crowleymarine.com/mercury...s/4859_170.cfm Look at the diagram to see if this is the same part you purchased. It should be an easy install. Or maybe you are talking about a diiferent Sensor?

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