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Chainsaw will not start when warm i think it is and ignition problem

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Have you warmed the saw up, verified it wont start and then removed the spark plug to see if you have spark ??? could it be an engine problem instead, plugged exhaust port or ???

Posted on Nov 28, 2013

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017 Stihl chainsaw problem


Could be the spark isn't as strong as you think it is. Could be the spark weakens when the unit is warm. Electronic module ignition needs an energetic pull at the best of times to get a strong enough spark for starting and if it is weaker it would be impossible to pull the starter cord fast enough.
Instead of testing the spark with the standard spark plug try using a spare plug with the gap opened to about 1 to 1.5 mm. The atmosphere in the cylinder during compression is much more dense than in open air and a much stronger spark is needed to jump the gap.

If the spark is satisfactory it could be the crankcase compression that is low, perhaps leaking past the crankshaft seals. If the chainsaw is little used and stands idle for longish periods this could be the problem. Seals tend to lose flexibility quicker under those conditions.

Mar 26, 2016 | Stihl Garden

1 Answer

Stihl 038 super av starts hard, once started runs great till its warmed up then dies and wont start


check the seals on the crankshaft for a leak and the ignition module for a loss of spark as it warms up.

Dec 07, 2012 | Stihl 038av Case Buffers Caps / Plugs 2...

1 Answer

Hi 260 42cc starts good but after using for awhile and shut it off it wont start, it will fire and run a few seconds and quits, does this every time but wont start and run, if i let it sit a few hrs and...


It could be a number of things, bad fuel ( stale) engine over heating and causeing vapour lock, or a bad ignition unit, start with fresh fuel, replace the fuel filter in the tank, try just slackeing the fuel cap and try starting again, this will rule out the fuel tank breather, if still no better replace the ignition unit.

Aug 02, 2011 | Poulan Pro 42CC 2 Cycle Chainsaw, 18"

1 Answer

Chainsaw starts fine, but after it warms up and I turn it off it doesn't want to start back up. Seems to be flooded? Put in new plug and filter, and always has fresh gas. What can I do?


You provide no model number. A look at your OM may have been beneficial. I think your warm start proceedure is the problem. Are you trying a warm start with ANY choke applied? Your OM should be similar to this:
Start Procedure
Cold:
  1. Ignition on/off to on.
  2. Set compression release – optional step even if saw is equipped with a compression release.
  3. Pull (close) choke, set fast idle (done when choke closed on some saws); pull starter and listen for an attempt to start. once heard (usually two pulls; no more than 4).
  4. Set compression release – optional step even if saw is equipped with a compression release.
  5. Push (open) choke pull starter until it starts. (usually first pull).
Warm:
  1. Ignition on/off to on.
  2. Set compression release – optional step even if saw is equipped with a compression release.
  3. Pull (close) choke, set fast idle (done when choke closed on some saws) – Do not pull with choke closed.
  4. Push (open) choke, pull starter until it starts. (usually first pull).
You might also remove the starter cover and inspect the crank and flywheel for a bad key. I have heard a couple of complainrts lately. Remove clean and reinstall the muffler and spark arrestor probably a good idea too.

If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH
Lou

Mar 21, 2010 | Husqvarna Garden

1 Answer

M842 chainsaw wont start when hot


I suspect your warm start procedure is the fault, the manual is not correct IMO. Any choke on a warm engine causes flooding, try this, if no better post back or return it for warranty replacement.

Start Procedure
Cold:
  1. Ignition on/off to on.
  2. Set compression release – optional step even if saw is equipped with a compression release.
  3. Pull (close) choke, set fast idle (done when choke closed on some saws); pull starter and listen for an attempt to start. once heard (usually two pulls; no more than 4).
  4. Set compression release – optional step even if saw is equipped with a compression release.
  5. Push (open) choke pull starter until it starts. (usually first pull).
Warm:
  1. Ignition on/off to on.
  2. Set compression release – optional step even if saw is equipped with a compression release.
  3. Pull (close) choke, set fast idle (done when choke closed on some saws) – Do not pull with choke closed.
  4. Push (open) choke, pull starter until it starts. (usually first pull).
If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH
Lou

Mar 13, 2010 | McCulloch Garden

1 Answer

It starts and runs but when you turn it off it won't restart.


I think the warm start procedure in the manual is causing it to flood. Try it like this, if you continue having problems reply below and we will try something else. PLEASE read #3 (Cold and Warm) a few times before attempting to start. Try it without 1/2 choke (your manual); completely open.
Start Procedure
Cold:
  1. Ignition on/off to on.
  2. Set compression release – optional step even if saw is equipped with a compression release.
  3. Pull (close) choke, set fast idle (done when choke closed on some saws); pull starter and listen for an attempt to start. once heard (usually two pulls; no more than 4).
  4. Set compression release – optional step even if saw is equipped with a compression release.
  5. Push (open) choke pull starter until it starts. (usually first pull).
Warm:
  1. Ignition on/off to on.
  2. Set compression release – optional step even if saw is equipped with a compression release.
  3. Pull (close) choke, set fast idle (done when choke closed on some saws) – Do not pull with choke closed or at 1/2 choke position.
  4. Push (open) choke, pull starter until it starts. (usually first pull).
Hope this helps.
Lou

Feb 21, 2010 | Poulan Garden

1 Answer

Chainsaw won't start when warmed up


Coil is possible, change the plug (cheap insurance) and try it. If problem persists try this shortly after it quits.
Ignition Coil Test by SmallEng.com
http://www.youtube.com/watch?v=L7WNBDRG4C4
You may need to use a jumper wire between the threaded part of the plug and the cooling fins. You do not have to bend up the electrode.

An index or business card is good for gap tool. Remove the plug, rotate until magnetic attraction pulls coil and card tight to flywheel, then tighten coil screws. Rotate flywheel until magnetic attraction eases, remove card, rotate a couple of revolutions and ensure nothing drags or contacts flywheel.

Homies are bad for clogged fuel vents too. When it begins to sputter roll it onto side and loosen fuel cap. If ti smooths out and runs properly it has a clogged vent. HTH
Lou

Dec 22, 2009 | Homelite Garden

1 Answer

Mcculloch 3516 chain saw, does not always start.


It must have spark, fuel and compression to run. Your task is to figure out which is missing.
Sometimes electrical components quit operating once beyond a certain temperature. Does it always start cold and become tempermental when warm?
IMO most hard start problems on a chainsaw with a good fuel delivery system are flooded.
Start Procedure
Cold:
  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close) choke, set fast idle (done when choke closed on some saws); pull starter and listen for an attempt to start. once heard (usually two pulls; no more than 4)
  4. Set compression release – optional step even if saw is equipped with a compression release
  5. Push (open) choke pull starter until it starts. (usually first pull)
Warm:
  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close) choke, set fast idle (done when choke closed on some saws) - Don’t pull with choke closed.
  4. Push (open) choke, pull starter until it starts. (usually first pull)
The 3516 is a MTD McCulloch (Chinese). These saws are in a class by themselves. Good Luck
Lou

Nov 15, 2009 | McCulloch Garden

2 Answers

Husqvarna 345 chainsaw will not start. It is 3 years old. No problem till now. spark good, getting fuel, filter, sparkplug good.


I suspect she is flooded. Flooding is the most common cause of fails to start on a chainsaw. Remove the plug I bet it's wet.
Start Procedure
Cold:
  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close) choke, set fast idle (done when choke closed on some saws); pull starter and listen for an attempt to start. once heard (usually two pulls; no more than 4)
  4. Set compression release – optional step even if saw is equipped with a compression release
  5. Push (open) choke pull starter until it starts. (usually first pull)
Warm:
  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close) choke, set fast idle (done when choke closed on some saws) - Don’t pull with choke closed.
  4. Push (open) choke, pull starter until it starts. (usually first pull)
Hope this helps
Lou
I've a 359 one time I forgot to pull then push the choke (sets fast idle). My shoulder gets sore just thinking about it.

Nov 10, 2009 | Husqvarna Forest & Garden No.967012396 345...

1 Answer

Want start


Read the warm start procedure from the operators manual.
1. Pull choke (sets fast idle)
2. Push in choke (fast idle retained)
3. Make sure ignition is on, pull (usually once on my saw)
4. Advance throttle slightly to release fast idle.
I made the mistake ONCE of not setting the fast idle. My shoulder gets sore thinking about it. HTH
Lou

Sep 21, 2009 | Husqvarna , No.455 Rancher, 20" Gas -...

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