backfire

[freezeplug]

i was told to try letting it idle for 30 to 60 seconds before shutting it down does that hold any truth ?

 

[My_guy99]

O yes definitely! At least 30 sec. Just burning off the extra fuel that way. Is it hard to start?

 

[freezeplug]

yes sometimes it's hard to crank . but not as much since i changed the plugs

 

[My_guy99]

Have you ever done or had to do a valve adjment

 

[freezeplug]

no . not to my knowledge, i'll try the 30 to 60 second shut down first but right now i gotta head to work thanks for your time and advice

 

[My_guy99]

I bet this is one if not the main problem, the valves aren't in adjustment, and you should check every year anyways, the do get loose which cause this and mainly a hard starting issue

 

[My_guy99]

Look into an adjustment as well

 

[chance123]

More often than not, a "backfire" when shutting down is caused by glowing carbon in the exhaust system (piston, head, ex port, pipe, and muffler). As you turn the ignition off, and as the engine coasts to a stop, it is still taking in fuel and the unburned fuel is exiting out and into your muffler. The muffler "might" have glowing red hot carbon in it and a backfire is a result. Also check your exhaust manifold gaskets which might allow air to enter making a backfire even more prevelant.

 

[freezeplug]

ok thank you guys for your assistance i really appreciate it. :thumbsup: