Spark plug failure on a Stihl 034 AV

woodchop · Jun 6, 2006

My saw did not start after a 15 minutes of cutting up a tree. Checked plug and had no spark. Changed the plug and started up on first pull. Ran a tankful of gas , filled it up and same thing, no spark. Changed plug and fired up.
Does anybody have any idea what could be causing this? Do I have a vacuum leak? I use the same gas in other saws and have no problem with them.

lawnmaniac883 · Jun 6, 2006

Try putting one of the old plugs back into the saw when it is COLD. If it starts you need an ignition coil.

Lakeside53 · Jun 6, 2006

yes... likely you have a failing ignition. The good news is that if you are the original owner, the coil has a lifetime warranty.

New coils are about $100. Used coils are all over the map but around $30 is common. If it has failed, you just need the 0000 400 1300 coil that is found in many Stihl saws.

woodchop · Jun 7, 2006

Thank you. Yes it starts when it's cold with the old plug. Looks like I'll be buying a coil.
Thanks again!!!

lawnmaniac883 · Jun 7, 2006

You dont have to buy a new coil. Take the saw to your dealer and he should outfit your's with a new coil absolutely FREE OF CHARGE!!! Stihl has a lifetime warranty on their ignition coils.

Lakeside53 · Jun 8, 2006

lawnmaniac883 said:
You dont have to buy a new coil. Take the saw to your dealer and he should outfit your's with a new coil absolutely FREE OF CHARGE!!! Stihl has a lifetime warranty on their ignition coils.

Only if you are the orginal owner.