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07-13-2015, 03:04 PM
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#1
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Senior Member
Join Date: Sep 2005
Posts: 101
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8.1 Engine "Backfire"
Well mabe not backfire, but exploding sounds down below that might be in the catalytic converters. We have a 2004 Bounder with about 60,000 miles on it The engine runs smooth on the level and does not burn oil. However when I start up a grade and the transmission shifts down, the explosions start. Because the engine runs so well I suspect it may be a bad sensor that is dumping too much fuel in it. I don't want to walk into a shop cold and get taken for a ride so would like to hear from anyone with a similar problem.
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04 Bounder 35E, W-22
Towing 2014 Honda CR-V
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07-13-2015, 03:53 PM
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#2
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Senior Member
Join Date: May 2005
Location: Full-timers - Home is where we park it.
Posts: 4,722
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Had the exact same thing happen on our 2005 W24. The next thing that will probably happen is the engine will start running rough and loosing power. As soon as ours did that, I replaced the spark plugs and wires. The roughness went away and so did did the backfiring on downshifts.
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07-13-2015, 03:55 PM
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#3
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Senior Member
Fleetwood Owners Club Workhorse Chassis Owner
Join Date: May 2009
Posts: 193
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Check spark plug wires. That would be my first guess. My 94 Bounder did that until I replaced them with after market ones. My Workhorse does that in heavy rain and they get wet. A lot of other thing could do it though.
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Randy & Kathy
2004 Southwind 37A
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07-13-2015, 04:36 PM
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#4
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Senior Member
Join Date: Oct 2002
Location: Madison, MS
Posts: 10,527
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Quote:
Originally Posted by RandyKathyM
Check spark plug wires. That would be my first guess. My 94 Bounder did that until I replaced them with after market ones. My Workhorse does that in heavy rain and they get wet. A lot of other thing could do it though.
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Next time it starts happening, check the air filter to see if it is wet. If so, the reduced air flow will cause the MAF to send faulty info to the ECM and that can cause the same symptoms. SOME of the early W-series air boxes did not seal out the fine mist/spray that is rampant in the wheel well and moisture got sucked in enough to affect performance. Been there, done that. Pictures are posted under my name in the iRV2 photo section.
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07-13-2015, 05:39 PM
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#5
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Senior Member
Workhorse Chassis Owner
Join Date: Dec 2007
Location: Surprise Arizona
Posts: 1,994
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Other possible causes. Clogged fuel filter or dirty MAF sensor.
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Harold & Linda
2009 CT coachworks siena 35V
W22 Workhorse 8.1L. Explorer Sport toad,
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07-13-2015, 08:11 PM
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#6
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 13,154
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You probably need plugs, wires, air filter and clean the MAF.
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2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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07-13-2015, 08:16 PM
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#7
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Senior Member
Join Date: Mar 2013
Location: Boise, Idaho
Posts: 715
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Quote:
Originally Posted by Arch Hoagland
You probably need plugs, wires, air filter and clean the MAF.
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And distributor cap if that year has one. (hairline cracks cause backfire issues)
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2016 Thor Tuscany 34ST XTE, Freightliner XCR, ISB 360hp/800tq. Allison 3000, Koni FSD shocks, Roadmaster 1.75" front sway bar, Safe-T-Plus, DYI air bag flow control valves.
2015 Jeep Willy's Wheeler Wrangler Unlimited Toad, Ready-Brute-Elite tow system.
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07-13-2015, 09:39 PM
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#8
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 13,154
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Quote:
Originally Posted by IdahoSRT10
And distributor cap if that year has one. (hairline cracks cause backfire issues)
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No distributor cap on the 8.1.
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2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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07-14-2015, 05:01 AM
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#9
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Senior Member
Join Date: Sep 2005
Posts: 101
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Quote:
Originally Posted by paz
Had the exact same thing happen on our 2005 W24. The next thing that will probably happen is the engine will start running rough and loosing power. As soon as ours did that, I replaced the spark plugs and wires. The roughness went away and so did did the backfiring on downshifts.
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Thanks, that is very encouraging info.
My next question is where you recommend buying the spark plug wires - GM dealer or auto parts store? Also, is there more than one configuration of the wires on an 8.1 engine?
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04 Bounder 35E, W-22
Towing 2014 Honda CR-V
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07-14-2015, 05:04 AM
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#10
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Senior Member
Join Date: Sep 2005
Posts: 101
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Just saw all of the other replies - thanks for the suggestions. The air filter is good but I have not changed the fuel filter.
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04 Bounder 35E, W-22
Towing 2014 Honda CR-V
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07-14-2015, 05:46 AM
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#11
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Senior Member
Join Date: Feb 2014
Posts: 102
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Try OEMY's web site for the parts.
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2004 Gulf Stream 8368 37' Workhorse W-22
Koni FSD's Ultra-Trak & Ultra-Power
Acme EZE Tow Kia Soul
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07-15-2015, 05:39 AM
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#12
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Senior Member
Join Date: May 2005
Location: Full-timers - Home is where we park it.
Posts: 4,722
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Quote:
Originally Posted by RamblinFever
Thanks, that is very encouraging info.
My next question is where you recommend buying the spark plug wires - GM dealer or auto parts store? Also, is there more than one configuration of the wires on an 8.1 engine?
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There are high temp aftermarket wires available, but I just bought wires and plugs from the local auto parts store. The MH version of the 8.1 uses the same wires as the Chevy/GMC pickup.
Some motorhomes have more problems with burned wires than others because of poor air flow around the engine and/or because of harsher driving conditions (more mountain climbing, faster speeds, heavier coach, etc.). In those cases, the high temp wires are better. IMO, plug wires starting to fail at 60k miles does not indicate a big heat buildup problem.
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07-15-2015, 07:44 AM
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#13
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Senior Member
Tiffin Owners Club Workhorse Chassis Owner
Join Date: Dec 2010
Location: Northern Virginia
Posts: 1,499
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If you are going to order a lot of items (plugs, wires, filters) try Rockauto.com
You pay shipping, but on multi-item orders it works out well.
__________________
Tom and Amy from Northern Virginia.
2000 Allegro 454/Workhorse P32/TST/Crossfire
Life is a DIY project, so own less and live more
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07-15-2015, 09:21 AM
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#14
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 13,154
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Over the years my experience with after market electrical components has been dismal.
I now buy all oil filters and electrical items from the dealer and stay with the OEM parts that came on the vehicle.
As paz mentioned, wires failing at 60,000 miles says they were pretty good to begin with so I stayed with the OEM wires when mine were replaced at the Workhorse dealer.
__________________
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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