Husqvarna 545 autotune starting trouble

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CAJ

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Question for the group...

I bought a husqvarna 545 a couple months ago as my first saw, so I'm a bit new to the whole thing and trying to get a feel for what's "normal".

When I first got it, I had some trouble getting it started, finally got it going, rev'd it up a bit, everything seemed great, so I shut it down and headed over to the tree (up a steep bank/cliff, so didn't want a running saw...). When I restarted it, I simply couldn't get it to rev up at all. Every time I'd give it any throttle, it would just die. Let it warm up a bit, no luck. Fortunately, I had brought a saw from work as a spare, so I set it aside for a bit and worked with that. Tried again several times over the next 2 hours with the same result every time. Took it back to the dealer and they got it going the next day and told me everything was fine but that I really needed to start it and quickly get it into some wood to make a couple solid cuts because that's the way the "autotune" tunes the saw, so that was probably my problem. Ok, I'll give that a try.

I tried that the next day and still had the same trouble once I started it - just didn't want to rev. As soon as I give it enough throttle to even think about turning the chain, it would die. I was finally able to get it going after ~5min of letting it warm up and trying to gently give it a little gas. Once I did, I immediately made some cuts and everything seemed good to go. I worked for a couple more hours that day and once it was warm, I could shut it down and restart no problem.

Unfortunately, I've continued to have the same problem every time I've used it since then. It's hard to start in the first place (pull several times w/ choke until it goes a touch, then choke off and pull a lot more until it actually starts). Then, I have to sit there and baby it, let it warm up and try to coax it into reving for 5min until I can actually start cutting. Once I get it going, it runs great.

Any thoughts? Somehow it doesn't seem like I should have this much trouble getting a brand new saw to run!

A few notes on what I've been doing so far in case any of it makes a difference...

1) I've run probably 12 or so tanks through it so far.

2) I've been using premium gas (with ethonol, unfortunately) with the husqvarna oil. I have a 1 gal. can and have been using the small, pre measured oil can for 1 gal to make sure I have the right mix ratio. I've also been using an additive to counteract the ethonol that also has a stabalizer in it (can't remember the name off the top of my heat) that was recommended by the dealer.

3) To start, I put the choke on and pull until it starts to catch, then take the choke off by squeezing and releasing the throttle then pull until it goes (total, that's probably 20-30 pulls). I haven't been using the decompression button at all - it's easy enough to pull without it on a saw this small.

Any thoughts/help is greatly appreciated!

Thanks
 
I have a new 545 and I haven't had much starting trouble with it, but my experience has been to only use the choke if the saw is stone cold.

Mine starts right up without using the choke if I've run it within the last 3 or 4 hours or if it's a warm day (+65 degrees f.)

The auto-tune module is designed to run the saw as lean as possible without engine damage during operation but it's also
designed to give it plenty of fuel to start and if the saw is warm it will flood if you're using the choke. Then it takes many pulls
to clear it.
 
Hmm, I don't think I've ever tried to start it on a day as warm as 65F, although yesterday was at least 60. Maybe I should give it a try without the choke. Most days that I've been using it, it's been in the 40 - 55deg range.

Have you had any trouble getting it to rev up once you've started it? That's the big thing that seems strange to me.
 
I haven't had trouble getting mine to rev up but I let it warm up at idle for 20-30 seconds before hitting the wood. My understanding is that the module adjusts itself under a load and then once the initial adjustment is made, it uses that as a baseline. I also run my mix at 40:1.
 
I have a 545 that I got back in the winter.

Never any real problems except when I restart it for any cut maybe 10 min later, I notice it readjusting the mixture again. It is OK with itself by the finish of the first cut and as long as you keep cutting it stays great.

A couple things I notice and it may be just the way you wrote it? To start a warm saw like this, you set the choke and then just click the choke part off - don't touch the throttle - and then start it up. If you touch the throttle after taking the choke off, it turns the fast idle off too. This makes the 545 hard to start.
 
A couple things I notice and it may be just the way you wrote it? To start a warm saw like this, you set the choke and then just click the choke part off - don't touch the throttle - and then start it up. If you touch the throttle after taking the choke off, it turns the fast idle off too. This makes the 545 hard to start.

Ok, that may be something that I'm doing wrong then. Just to clarify, my trouble is with the saw when it's cold, not warm. That said, I have been setting the choke, pulling until it starts to catch and then taking the choke off using the throttle. Sounds like I should be taking it off just by flipping the choke lever back up?

I'm headed out to cut some wood after work tonight, so I'll give that a try.
 
Is the chain brake on? I've seen saws that'd start cold but die with the brake on if you revd them. And I agree with the guys above you don't always need to choke it. Flooding a saw can be a frustrating and time consuming deal.
 
Is the chain brake on? I've seen saws that'd start cold but die with the brake on if you revd them. And I agree with the guys above you don't always need to choke it. Flooding a saw can be a frustrating and time consuming deal.

I should have mentioned that! No, the chainbrake is off.

A question about the flooding though - it makes sense that it might be causing some of the starting trouble, but I'm assuming that wouldn't be continuing to make it not want to rev for the first several minutes, right? Does anyone have any thoughts on that part?

Thanks!
 
I should have mentioned that! No, the chainbrake is off.

A question about the flooding though - it makes sense that it might be causing some of the starting trouble, but I'm assuming that wouldn't be continuing to make it not want to rev for the first several minutes, right? Does anyone have any thoughts on that part?

Thanks!

If it's loaded with a fuel rich mixture it will bog and die. Take your plug out with the switch off hold the saw upside down and give it about 10 pulls. Make sure your tank is empty when you do this. Then I always take my plug and us a lighter and burn off the excess fuel off it.
 
If it's loaded with a fuel rich mixture it will bog and die. Take your plug out with the switch off hold the saw upside down and give it about 10 pulls. Make sure your tank is empty when you do this. Then I always take my plug and us a lighter and burn off the excess fuel off it.

Ah, thanks.

Sounds like the whole thing may just be the way I'm starting it. I'll give it a try either without the choke or with if needed, but taking it off without the throttle tonight and see how it goes.
 
then take the choke off by squeezing and releasing the throttle

This is your problem. Turning the choke off by squeezing the trigger also turns off the high idle setting on the carb. All you need to do is push the choke button back down, which will leave the carb set on the high idle position.
 
similar issue

I purchased the 455 with autotune this winter. I had similar issues starting mine. For my saw I've found that the decompression switch is not really required and I don't use the "choke" unless it is cold. It usually starts on the 2nd or 3rd pull. Then I kind of let it go through it's paces. It will idle slow then go into a high idle and once it returns to a normal idle I am able to give it gas without stalling. This all happens I would guess in 30 seconds or a minute at most.

These are just things that I have observed. I know you have a different saw but I would think the autotune would function in a similar fashion. Maybe you could stop by the dealer and have them put it on the computer if somebody here can't help. The computer tells all.
 
This is your problem. Turning the choke off by squeezing the trigger also turns off the high idle setting on the carb. All you need to do is push the choke button back down, which will leave the carb set on the high idle position.

Said it for me! :msp_thumbup:
 
Said it for me! :msp_thumbup:

Thanks guys!

I'll give that a try tonight. Never realized how much I was changing just by killing the choke with the throttle! Some how I thought that's the way I was supposed to do it, but not sure where that came from.
 
Thanks guys!

I'll give that a try tonight. Never realized how much I was changing just by killing the choke with the throttle! Some how I thought that's the way I was supposed to do it, but not sure where that came from.

I know it is allegedly against the manly man code, but there is a manual with new saws...just sayin...what exactly does yours say about proper cold start?
 
I know it is allegedly against the manly man code, but there is a manual with new saws...just sayin...what exactly does yours say about proper cold start?

The lost art of RTFM!

Even the Stihlheads have a high idle position on the master control lever, but likewise they just pull and pull and pull.
 
The lost art of RTFM!

Even the Stihlheads have a high idle position on the master control lever, but likewise they just pull and pull and pull.
I thought it was pay and pay and pay.....
 
The lost art of RTFM!

Even the Stihlheads have a high idle position on the master control lever, but likewise they just pull and pull and pull.

Well, I hardly ever pull more than twice on the 441C, sometimes just once..

I thought it was pay and pay and pay.....

Well, that could be true... :msp_biggrin:
 
I know it is allegedly against the manly man code, but there is a manual with new saws...just sayin...what exactly does yours say about proper cold start?

Yup. In this case it wasn't an issue of not reading, but not remembering! Somehow I got it in my head that I was supposed to take the choke off w/ the throttle - and thought that came from what I read in the manual but hadn't gone back to check. I had actually just looked back last night before I saw your reply and, big surprise, it says to do exactly what you guys are telling me to... That should teach me!


Unfortunately, life got in the way last night and I didn't even have a chance to go start the saw let alone go cut wood. I'll try to make sure I at least have a chance to start it up tonight and see if using the correct procedure helps.
 
Yup. In this case it wasn't an issue of not reading, but not remembering! Somehow I got it in my head that I was supposed to take the choke off w/ the throttle - and thought that came from what I read in the manual but hadn't gone back to check. I had actually just looked back last night before I saw your reply and, big surprise, it says to do exactly what you guys are telling me to... That should teach me!


Unfortunately, life got in the way last night and I didn't even have a chance to go start the saw let alone go cut wood. I'll try to make sure I at least have a chance to start it up tonight and see if using the correct procedure helps.

Well, good for you! Sometimes it is the little things, heck...heard a rumor,,some richard cranium was yanking and yanking on some saw..wouldnt start.

Amazing what flicking the button to ON will do......

;)

Heard another tale.....same deal, yank yank yank NUTHIN...@@$^^&#!! CHOICE LANGUAGE, wt.. just cleaned this thing up nice and purty, fresh mix..hmm..pull air cleaner off..Wow, saws sure do start and run better with the spark plug wire on the plug!!!

;) ;)


Best tale...saw starts and runs fine, then nuthin. engine running, no cutting action. OMG, boss s saw, musta broke it somehow..eek...drag to the shop....guy starts laughing, CLICK..unlocks brake...nameless richard cranium, who had only ever run older saws before this new one, goes..I thought that was just a fancy knuckle guard!

;) ;) ;)
 
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