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#4805025 - 07/04/18 01:27 PM Pressure washer engine backfiring
dawgn86 Offline


Registered: 08/03/11
Posts: 26
Loc: Georgia
Hi All

I bought a new pressure last year from Northern Tool...3000psi with a Honda engine GX160 or 190 engine.

It cranks and runs well, but when I let off the pressure trigger, it backfires many times. I use a quality fuel ( the non ethanol )...

Any ideas of how to cure this?

Thanks

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#4805029 - 07/04/18 01:32 PM Re: Pressure washer engine backfiring [Re: dawgn86]
demarpaint Offline


Registered: 07/03/05
Posts: 29992
Loc: NY
Check the spark plug, but odds are it probably is in need of a carburetor adjustment. I've had it happen over the years and a carburetor adjustment did the trick. Sometimes the vibration knocks them out of adjustment.
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#4805031 - 07/04/18 01:35 PM Re: Pressure washer engine backfiring [Re: dawgn86]
Rand Offline


Registered: 08/20/03
Posts: 12726
Loc: NE,Ohio
does it sound like its under a high load when its doing this?
might be the unloader.

If its not working right its trying to compress water that isnt flowing.

Some of these pumps have a very tiny hole and they get clogged with debris from your hose or water.
(I always flush my hose for a min before hooking up)

If it sounds like it is under no load when its backfiring.. its probably some kind of carb issue.

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#4805091 - 07/04/18 02:31 PM Re: Pressure washer engine backfiring [Re: dawgn86]
Donald Offline


Registered: 03/21/04
Posts: 20549
Loc: Upstate NY
Check for clean cooling fins, mouse nest.


Edited by Donald (07/04/18 02:32 PM)
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#4805124 - 07/04/18 03:12 PM Re: Pressure washer engine backfiring [Re: dawgn86]
dawgn86 Offline


Registered: 08/03/11
Posts: 26
Loc: Georgia
I got it last summer and used it some...used it a few weeks ago and noticed the backfire...does when when you let off the pressure...hate to think the unloader or carb is out of whack with it being less than a year old. I have a new plug to try and see if that helps.

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#4805140 - 07/04/18 03:28 PM Re: Pressure washer engine backfiring [Re: Donald]
Kira Online   content


Registered: 08/19/10
Posts: 5416
Loc: Champlain/Hudson Valley
'Twas just going to say that. A mouse nest made my friend's B&S 22HP (lawn tractor) backfire

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#4806251 - 07/05/18 09:02 PM Re: Pressure washer engine backfiring [Re: dawgn86]
dawgn86 Offline


Registered: 08/03/11
Posts: 26
Loc: Georgia
So, I fired up the pressure today and used it about a half hour..no backfire at all....maybe the new plug did the trick. I also put in some Start Tron as well.

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#4806678 - 07/06/18 10:36 AM Re: Pressure washer engine backfiring [Re: dawgn86]
meep Offline


Registered: 02/20/07
Posts: 3569
Loc: Southeast
running lean will backfire. overheated valves will promote backfire (too tight). sometimes I've seen very efficient engines, when under zero load, spit and pop, as they spin free. you can also try a different fuel. if it's not burning completely, it will ignite when it passes through the muffler
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#4806733 - 07/06/18 11:45 AM Re: Pressure washer engine backfiring [Re: meep]
dawgn86 Offline


Registered: 08/03/11
Posts: 26
Loc: Georgia
Thanks...that will be the next thing I try if it returns

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