Recent Topics
Resuing mower oil!
by KMJ1992
23 minutes 22 seconds ago
2015 Audi Q7 Transmission Service
by rooflessVW
44 minutes 5 seconds ago
Curious Questions regarding Engine Wear
by mbacfp
Today at 11:42 AM
Bridgestone Driveguard worked as advertised!
by LeakySeals
Today at 11:30 AM
Renewable Lubricants Inc. Dexos 1 gen 2 SN plus?
by 2James1
Today at 10:52 AM
2017 VW -- mildly cold Air Conditioning
by BAJA_05
Today at 10:50 AM
Lot of New Oil Filters - SF Bay Area/Marin County
by dogememe
Today at 10:38 AM
13 Tundra crank/no start
by pda1122
Today at 10:31 AM
16 CX-5 using oil
by pda1122
Today at 10:06 AM
castrol edge ep 5w-20 ?
by dogememe
Today at 09:41 AM
Bags of MTD 30 weight oil
by Snagglefoot
Today at 09:37 AM
Castrol Edge 0/40 sale/Amazon prime members only
by Bullwinkle007
Today at 09:37 AM
Kart Racing engine oils?
by racin4ds
Today at 09:36 AM
Valvoline 5w40 CK-4 in 2014 F250
by Rocdoc27
Today at 07:43 AM
castrol go m/c oil rated sg and jaso ma2...???
by kmrcstintn
Today at 06:44 AM
2006 Prius - Hybrid Battery Failure
by The Critic
Today at 02:01 AM
amazon missing package. how often?
by WhyMe
Today at 12:15 AM
Filter Minder naysayers!
by ThunderOne
Yesterday at 09:57 PM
Is there a 1 piece 75 Ohm to 300 Ohm coa connector
by daves66nova
Yesterday at 08:46 PM
Help me choose camper wheels
by spasm3
Yesterday at 08:44 PM
Newest Members
bjay, javylsu, Jlb27537, katnapped, Denniso
65501 Registered Users
Who's Online
91 registered (ad244, 379KITTY, 2015_PSD, 28oz, 2012AccentSE, 9 invisible), 1656 Guests and 35 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65501 Members
67 Forums
287219 Topics
4791463 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#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?


#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.
God Bless Our Troops

#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.

2019 Jeep Cherokee Trailhawk 2.0T

#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)
2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)

#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.

#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

#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 backfire at all....maybe the new plug did the trick. I also put in some Start Tron as well.

#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
2018 F150
2015 crv (wifey!)
2009 s60 2.5T

#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