Ive been reading the forum for a while and there is some really good info here. <br /><br />I have a 150 TRP OX66 efi. I use it mostly in saltwater. I take meticulous care of it. Water pump, plugs, fluid changes, filters, grease, oil clean, etc. I use this boat year round so there isn't any down time, maybe 4 weeks at max. Last time out, as soon as I cleared harbor and started to get on plane it had a severe bump or miss. I thought i had hit something. Checked around and nothing and started again and the same bump at about 3000 rpm. If I idled around no problem but if I tried to get on plane it would miss.<br />This is what I have looked at.<br />1. I thought it was the lower unit . So I drained lower unit. Perfect, not milky, no sign of metal shavings. Re torqued props, checked shift rod adjustment , all okay. <br />Tested , still has miss.<br />2. Removed Primary fuel pumps and pressure/vacuum tested. OK<br />I'm going to look at the VST system next. Am I on the right course ? I do have a Yamaha shop manual but the trouble shooting is limited. My son just got out of MMI in Orlando last year as a boat tech. He knows a whole lot more than the old man about this stuff. But Its hard to get him over to take care of my stuff working 50 -60 hr wk. He told me don't be messing with stuff till he could get over there. Smartalic kid! LOL Anyway I need some direction I need to get back on the water.<br />MikeT
