Search results

Ok. today's update. I replaced the plug boots. I bought a fuel pressure tester. Fuel pressure seemed to be right about 34 psi. That's with the key on, idle, and up to 3500 RPMs (that is as high as I was comfy running in a bucket) Outboard fired right up. idled between 500 and 600 RPMs. This...

Ya. VST was very clean. Can’t say for sure I could see my fingers but suspect I could. no sure about alarm. Hoping it’s was just odd fluke w O2 running rich. Weird that it never alarmed this winter the couple times it was used after the problems began. only thing I did between then and now...

Haha of course. But should it stay around 35, throughout throttle range?

-I didn’t smell them. I will tho. -VST filter seemed very clean (as has been the usual) -this fist occurred end of last summer. After it first occurred, we used the boat 2 more times on very short 20 runs. Same -last week I installed the cleaned recalibrated injectors and cleaned the O2...

Ok. I found a fuel pressure tester. and about to go do a check. SO pressure at that check valve should be 35.6 (according to manual). BUT does this mean with key in "run" position but not started AND when outboard is running?

I’m trying to diagnose a loss of WOT RPMS (from 5500 to 4700) and increased fuel consumption ( from 12 gph to 17gph) -clean VST and filter (spotless) -cleaned O2 sensor & housing (lots of carbon & oil) -cleaned and recalibrated injectors (they were clean but all flooding) -new Tstats and PCV...

Seasick, you are a wealth of information and I sincerely appreciate you taking the time to help. Gosh, I wish you were my neighbor! Well, I guess it’s good to know the pumps can go bad AND NOT see gas leak out the back. These are 1 year old OEM pumps, but I guess they could still be bad...

Thanks guys. SeaSick. I did do the flame test. And it did seem to fluctuate volts when flame was applied. Albeit, seamingly very sporadic. Dennis, I did fine that section in the manual. I guess I have a hard time understanding it tho. I assume I have to perform this test w the outboard...

Sorry. Loosen the 2 bolts that hold each pump to the block.

Ok. With everyone’s help, I’m getting this narrowed down. the primer bulb gets firm w low pressure fuel pumps attached. BUT when I loosen the bolts, the bulb goes soft and won’t firm back up after pumping and pumping. BUT I don’t see any external leaks. is this normal? With pumps loose, where...

You know I didn’t end up finding the O2 test. But I’m really at a loss. Just seems like most likely cause. Seems I’ve ruled out every other like suspect. Maybe, I’ll get lucky and talk to Andy at Sim tomorrow..

Hello I'm about to bite the bullet and order a new OEM O2 sensor for my 2005 200 hp OX66 (Yamaha Saltwater Series II). All three of the big sites (boats.net, SimYamaha, and Crowley Marine) have similar prices. However, being in Alaska the shipping prices are similarly outrageous. Ok, I live...

Thanks guys. I haven't checked for spark yet. I will this evening, after the sun sets. I do have a manual, but it doesn't show the O2 sensor test. I have read that you need a special harness for the test. there is also a flame test, I tried that. but seemed inconclusive. Wow, that's...

Hello all So I am having a problem w my 2005 200hp OX66. I no longer can get above 4600 at WOT (used to be 5500) and my fuel consumption is even worse (now 17 gal/hr was 12 gal/hr). I suspected a stuck injector. So they were sent into Brucato FIS. he cleaned and recal to spec (they were ALL...