Mastermind
Work Saw Specialist
I like that idea.
Yes, those notches can be used to direct flow toward or away from fuel outlet ports. However, given how many there are and where they are located it would appear they are intended to direct flow away from fuel ports, and therefore to prevent picking up more fuel.swiss cheese does more than just raise idle speed my friend.
I like that idea.
From what I've seen you are on the right track.
Just adding to what you posted......
"They have clearly been drilling holes in the throttle plate".....
And notches. The extra air that has been introduced must raise idle speed.......there ain't no way around that. To compensate, I believe that the AT system adds more fuel. That added fuel pools behind the throttle plate. Crack the throttle.......that fuel dumps into the case and causes a bog.
They can add all the bandaids they want.......but this issue is common, and tough to fix.
To each there own.
You can do your usual when I post something on the 562 threads, I don't mind, my ignore button is a cord in the wall.
Right. That's where I'm confused. If Hamish is right that the 46 and 44 are essentially the same carburetor, then he has noticed a connection between the TPS percentage number and the appearance of the bog. That is interesting if it holds up under more testing or your experience with these things. It would make sense that a throttle position mismatch between the actual throttle position and where the sensor thinks it is could have a bad effect. So I thought I would ask for clarification on just what the TPS at 100% or 94% really means.I've been able to fix it by replacing the 46 with a 44. I use the 46 module on the 44.
Do you think there are several things all going on at once? There was progress made by notching the throttle plates, and it seems there is progress being made by working with the TPS signal. I had meant to ask you about the fuel puddling idea as well, which may also be involved. I wanted to see if you would expand on it. Would the puddle go away if the saw was oriented properly, or drip out the carb throat where it could be seen if the saw was idled on its side. That seems like the type of idea you could test to see if it held up under scrutiny.I noticed that the TSP bounced around a little too much when testing these carbs with the diagnostic setup. To get a cleaner reading between the magnets and the pickup, I shimmed the magnets (that are on the throttle shaft) out closer to the pickup sensor.
That helps these things a bunch.
And on that note, good night to all. For not having one of these saws, I've really enjoyed following the detective story of trying to get them to run right....I bolted on my new EL48 tonight, using the module that was on the EL46. I knew it was a different saw as soon as I started it. There might be the slightest hint of a hesitation after it's hot, but you almost have to imagine it to notice it. It made a big difference. I'm going to send the module out to be programmed and see how that does. I'm feeling good about this
At WOT the TPS should read 100% (aka full throttle). From an idle standpoint the butterfly would be at the idle position whereas the fuel valve as mapped is not.. So I thought I would ask for clarification on just what the TPS at 100% or 94% really means.
Now that my little mind can comprehended. It makes sense.At WOT the TPS should read 100% (aka full throttle). From an idle standpoint the butterfly would be at the idle position whereas the fuel valve as mapped is not.
Maybe so. However if you want to stay in business you must work within the constraints, or go out of business. The blame falls on the manufacturer IMHO.I just wish to extend my sincerest thanks to the EPA for saving us from the plight of chainsaw pollution. Please carry on.
Now ask yourself why the US market is not flooded with Chinese saws like in OZ?I just wish to extend my sincerest thanks to the EPA for saving us from the plight of chainsaw pollution. Please carry on.
That's interesting - but nothing says the software cannot interpret a reading of 94% as full throttle. It's not a big deal to compensate for hardware tolerance in software this way, in fact it's pretty common. TPS in cars are pretty sloppy too, but the system corrects for that.At WOT the TPS should read 100% (aka full throttle). From an idle standpoint the butterfly would be at the idle position whereas the fuel valve as mapped is not.
Yes, those notches can be used to direct flow toward or away from fuel outlet ports. However, given how many there are and where they are located it would appear they are intended to direct flow away from fuel ports, and therefore to prevent picking up more fuel.
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