TPS adjustment 95 XRI

[THEFERMANATOR]

I have a 95 XRI 150 that I am trying to verify the TPS adjustment on. I did a search and it seems that .135 is the accepted adjustment for the TPS, but want to verify this. I disconnected the temp sensor on the port head and probed it and mine was set to .221. The engine has always used ALOT of fuel when cruising(12-13 GPH), and smoked pretty good at idle on 50:1 pre-mix. I set it back to .150 and it started like crap(run a half second and stall, did this about 3 times then kept going), but seemed to run smoother(this was on the hose). I turned it up to .165 and this seemed to help starting, while still idling cleanly. I probably shouldn't mess with it since I am selling it, but want it to run cleanly for a perspective buyer.

[THEFERMANATOR]

Well now i did a search under TPI adjustment and see where the 2.5 is said to be set at .250 volts. Does anybody have a manual that specifies what it should be? I know at .145 where I have it at now it runs ALOT cleaner and throttle response is much crisper, but I don't want to burn a piston up on it. I haven't put it in the water yet, plan on doing that tommorrow. Would like to know the right voltage before hand though. I also went through and hooked the yellow/black wire into the yellow/red enrichment circuit for cold starting and put a diode in between the solonoid and the yellow/red so that the factory side works as well. Once it is started the enrichment seems to be overridden and no longer works, but it definately helps for starting. At the .145 on the hose I get no lean sneezing now, and much less smoke. Like I said though, don't want to burn a piston.

[gringo]

There must be more out there on this , ANYONE?

[rickriddle]

.150 is for the 2.4, .250 for the 2.5. My motor would not plane out at .150 when I spun a larger wheel as the motor would lean out on the bottom.

[drasticplastic]

On your 2.5 liter, the factory specs are .200 through .300 volts with .250 being the factorys idea of perfect. .250 is where they set them when they were built. The specs for a 2.4 liter are .050 through .200 with .135 volts being the factorys idea of perfect.

[THEFERMANATOR]

I went back and set it to .200 and will put it in the water tommorrow and run it. Goin back to .200 VS .150 smoothed the idle out, but made it smoke again at idle. It does start easier at .200 than .150 so I'll see tommorrow what it does. I figure the .200 would be better than the .221 it had to begin with since it would load up at idle before. I see that this system uses no MAP sensor, so I assume it uses strictly RPM's for fuel metering up high since I read that the TPS isn't used beyond 3500? This still makes me wonder why this thing uses so much fuel?

[THEFERMANATOR]

Well I aquired a copy of the MERCURY manual pertaining to this(have the PDF files I can E-mail if you need them), and if your ECM is part number 14623A15 and up your TPS range is the .200-.300. So I raised it to .240 and it actually raised my RPM's up about a hundred and cleared some of the smoke up. I guess it was too lean and loading it up with oil since there wasn't enough fuel to burn. Should have richened it to begin with I guess since it has always run a bit warm in the 1000-1400 RPM range, but the excess smoke made me think it needed less fuel. Find out here shortly.

[THEFERMANATOR]

Well it idles better now than before, but it runs hotter at part throttle and feels rich from off idle to 3400. So I may lower it back down a little bit and call it good. Although I was real happy since the boat ran the fastest I've ever had it, 59.7 MPH for a moderatly heavy flats boat with a 150 aint to bad.