2252 jonsered needs healed

[Boomer 87]

Ok, so i havent gotten anywhere with my 2252 that wont run WOT, idles only and not that well at that. The local dealer must not be as up on the autotune stuff. I did get them to do a master reboot. Made no change.

Is there anybody on here that has the software to do whats needed? I know nothing of how they work all i know is it doesnt. Turns my stomach to have someone work on my equipment as ive been an auto tech for 15 years, but i need a ringer on this one.

 

[huskyboy]

Ok, so i havent gotten anywhere with my 2252 that wont run WOT, idles only and not that well at that. The local dealer must not be as up on the autotune stuff. I did get them to do a master reboot. Made no change.

Is there anybody on here that has the software to do whats needed? I know nothing of how they work all i know is it doesnt. Turns my stomach to have someone work on my equipment as ive been an auto tech for 15 years, but i need a ringer on this one.

Call @Spike60 at his shop ashokan turf and timber.

 

[Boomer 87]

Ok ill see if i can reach him. I hate to do it bc ill have to pay shipping and for the repair, ill have more in it than ill ever be able to get back out of it. But sure as hell does no good like it is.

Rich dugan wanted 125.00 plus any parts i thought that was kinda high

 

[Dub11]

For that much money, cant you just buy the "brain" stuff for it?

 

[Boomer 87]

I dont know, i know i can get a carb for 75.00 but i dont know that it comes with a processor or not idk. Im so dumb when it comes to the autotune stuff . Im clueless. I need to learn though bc i have a 545 and a 576 also but they actually run lol

 

[Dub11]

https://partstream.arinet.com/Mobil...EEzqu3uUHFkwlKSwzKBpR66BkJDOx4bTlq-1VrQ2.html

Here is a link to @Gentleman Oem ope parts site. The 545 is the cousin to the 2252 right?

I dont know if it will help but his prices are good.

 

[Boomer 87]

545 should be yes

 

[whitesnake]

Can you swap parts off the 545 to figure out the problem?

 

[jacob j.]

I think I have an extra 545/550 ignition module that you can have. I'm not sure if it would help your current problem but it might send the right signal to the carb.

 

[sunfish]

Rule out an air leak first, before replacing parts.

 

[Boomer 87]

Ugh guess i should do my due diligence as far as air leaks go.Funny thing is the longer it runs and hotter it gets, the faster it will run. Ive got maybe 8-9k but as soon as you got WOT it bogs down and quits. But it will always restart.

 

[Boomer 87]

Id like to know exactly how the system works. Its probably rudimentary in comparison to the vehicle systems im used to. But ive not ever been able to find how exactly it calculates fuel mixtures. I assume these autotune carbs can be kitted same as old school ones?

 

[MarkEagleUSA]

But ive not ever been able to find how exactly it calculates fuel mixtures.

It doesn't. Basically it just tries to lean out the mixture while watching RPM's. When the RPM rises it pumps a little more fuel to keep it from leaning out too far. Essentially just keeps adding fuel which is why AT saws can run with air leaks that would kill a standard carbed saw.

 

[Boomer 87]

Ok that makes sense. So its similar to the old carbs that govern using air speed in the venturi to open a check valve. Its esentially doing the same thing only watching actual engine rpm, if engine rpm gets past a threshold it lets alittle more fuel in.

 

[Poleman]

Just a FYI, If you buy a new carb you can use your electonic module from your old carb since it has the updates already on it. Easy way to change carbs without visiting the dealer to program the new carb.
I did this recently on 562 and worked fine.

 

[Boomer 87]

Thts good to know i may try that too

 

[beaglebriar]

@Tor says these go through flywheel side seals pretty regularly. If it's a autotune problem Bob (spike60) was a huge help when I replaced the carb on my 562.

 

[Boomer 87]

I need to get a compression tester and just check that also. Gotta find a adapter for the tiny plug. I appreciate all the help, im gonna get physical with it real soon.

 

[beaglebriar]

With an adapter the compression will read lower than actual.

 

[Tor R]

Before you even consider to swap parts, get out the reading from the AT first, information from that reading will tell you alot whats going on with your 545.
There is at least 4-5 different coils and 3-4 carbs, they has to be matched, you can swap around but if you're changing a coil that was different then yours you have to flash the carb, and also the same work has to be done if your changing your carb.
I rather do the AT reading before I even consider a preasure/vacuum test