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Pressure washer engine backfiring #4805025
07/04/18 01:27 PM
07/04/18 01:27 PM
Joined: Aug 2011
Posts: 199
Athens, GA GO DAWGS
dawgn86 Offline OP
dawgn86  Offline OP

Joined: Aug 2011
Posts: 199
Athens, GA GO DAWGS
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


2006 Nissan Pathfinder Mobil 1 Synthetic 5w-30
2008 Nissan Frontier Mobil 1 Synthetic 5w-30
2012 Jeep Cherokee Laredo Penzoil 5w-20 Synthetic
2013 Toyota Tacoma PreRunner 0w-20 Valvoline Synthetic
Re: Pressure washer engine backfiring [Re: dawgn86] #4805029
07/04/18 01:32 PM
07/04/18 01:32 PM
Joined: Jul 2005
Posts: 31,694
NY
demarpaint Offline
demarpaint  Offline

Joined: Jul 2005
Posts: 31,694
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.


God Bless Our Troops

Re: Pressure washer engine backfiring [Re: dawgn86] #4805031
07/04/18 01:35 PM
07/04/18 01:35 PM
Joined: Aug 2003
Posts: 13,438
NE,Ohio
Rand Offline
Rand  Offline

Joined: Aug 2003
Posts: 13,438
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.



2019 Jeep Cherokee Trailhawk 2.0T
Re: Pressure washer engine backfiring [Re: dawgn86] #4805091
07/04/18 02:31 PM
07/04/18 02:31 PM
Joined: Mar 2004
Posts: 21,863
Upstate NY
Donald Offline
Donald  Offline

Joined: Mar 2004
Posts: 21,863
Upstate NY
Check for clean cooling fins, mouse nest.

Last edited by Donald; 07/04/18 02:32 PM.

2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Pressure washer engine backfiring [Re: dawgn86] #4805124
07/04/18 03:12 PM
07/04/18 03:12 PM
Joined: Aug 2011
Posts: 199
Athens, GA GO DAWGS
dawgn86 Offline OP
dawgn86  Offline OP

Joined: Aug 2011
Posts: 199
Athens, GA GO DAWGS
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.


2006 Nissan Pathfinder Mobil 1 Synthetic 5w-30
2008 Nissan Frontier Mobil 1 Synthetic 5w-30
2012 Jeep Cherokee Laredo Penzoil 5w-20 Synthetic
2013 Toyota Tacoma PreRunner 0w-20 Valvoline Synthetic
Re: Pressure washer engine backfiring [Re: Donald] #4805140
07/04/18 03:28 PM
07/04/18 03:28 PM
Joined: Aug 2010
Posts: 6,231
Champlain/Hudson Valley
Kira Offline
Kira  Offline

Joined: Aug 2010
Posts: 6,231
Champlain/Hudson Valley
'Twas just going to say that. A mouse nest made my friend's B&S 22HP (lawn tractor) backfire

Re: Pressure washer engine backfiring [Re: dawgn86] #4806251
07/05/18 09:02 PM
07/05/18 09:02 PM
Joined: Aug 2011
Posts: 199
Athens, GA GO DAWGS
dawgn86 Offline OP
dawgn86  Offline OP

Joined: Aug 2011
Posts: 199
Athens, GA GO DAWGS
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.


2006 Nissan Pathfinder Mobil 1 Synthetic 5w-30
2008 Nissan Frontier Mobil 1 Synthetic 5w-30
2012 Jeep Cherokee Laredo Penzoil 5w-20 Synthetic
2013 Toyota Tacoma PreRunner 0w-20 Valvoline Synthetic
Re: Pressure washer engine backfiring [Re: dawgn86] #4806678
07/06/18 10:36 AM
07/06/18 10:36 AM
Joined: Feb 2007
Posts: 3,774
Southeast
meep Offline
meep  Offline

Joined: Feb 2007
Posts: 3,774
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


2018 F150
2015 crv (wifey!)
Re: Pressure washer engine backfiring [Re: meep] #4806733
07/06/18 11:45 AM
07/06/18 11:45 AM
Joined: Aug 2011
Posts: 199
Athens, GA GO DAWGS
dawgn86 Offline OP
dawgn86  Offline OP

Joined: Aug 2011
Posts: 199
Athens, GA GO DAWGS
Thanks...that will be the next thing I try if it returns


2006 Nissan Pathfinder Mobil 1 Synthetic 5w-30
2008 Nissan Frontier Mobil 1 Synthetic 5w-30
2012 Jeep Cherokee Laredo Penzoil 5w-20 Synthetic
2013 Toyota Tacoma PreRunner 0w-20 Valvoline Synthetic
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