RV News RVBusiness 2021 Top 10 RVs of the Year, plus 56 additional debuts and must-see units → ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > THE CHASSIS CLUB FORUMS > Workhorse and Chevrolet Chassis Motorhome Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 09-15-2013, 05:02 PM   #1
Junior Member
 
Join Date: Sep 2013
Posts: 5
Angry 8.1 Chevy Pops and looses power on grades

Hope someone can help me on this very challenging problem. Love our Winnebago and everything has been great until about two years ago on a trip. The engine runs great on flat ground and gets anywhere between 8-10 miles per gallon.
Now the engine pops loudly and looses power on a climb. As soon as I start a hill and the motor has a load on it it starts.
I have done just about everything I can can think of: plugs, plug wires, fuel filer, compression, emptied tank and put in 92 non ethenol in it, lots of additives, cps.
I've had two reputable mechanics ride me and put their portable scanners on the engine. No fault codes of any kind.
Has anyone else had this problem and fixed it?
kruzer55 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 09-15-2013, 06:06 PM   #2
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 21,773
Sorry your having problems.
Plugs, wires and filters have been the cure for most, 8.1L, performance issues that I'm aware of , but the Workhorse crew should be along with more help shortly.
Questions;
Is the pop a single item when you go full throttle or continual while you've got your foot in it ?
Has the Mass Air Flow sensor been examined ?
EGR valve , checked ?
Is the intake manifold vacuum at a normal level ?
JMHO: Only thing I can think of would be weak valve springs; sticky intake valve.
How many miles on the engine ?
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 09-15-2013, 06:22 PM   #3
Senior Member
 
Dmorgan6375's Avatar
 
Join Date: May 2013
Location: Delmar, Md.
Posts: 3,714
Coil(s)? Maybe!
__________________
[FONT="Century Gothic"]Douglas M. Morgan RVM96
04 Dolphin 6375 LX W-24 Chassis #434136
"The Journey is our Destination" Delmar, Md.
Dmorgan6375 is offline   Reply With Quote
Old 09-15-2013, 06:33 PM   #4
Senior Member
 
Country Coach Owners Club
Retired Fire Service RVer's
Join Date: Feb 2013
Location: Ocala, Florida
Posts: 6,295
Welcome and glad to meet you!

You might get more answers by posting in the appropriate forum. Many of the people that can answer this do not come to the Introduce Yourself forum.
__________________
FMCA #F431170, GS #822128658, Escapees SKP #112655
2012 Airstream Mercedes Interstate Class B
[SIGPIC][/SIGPIC]
Medico is offline   Reply With Quote
Old 09-15-2013, 08:15 PM   #5
Community Administrator
 
JohnRR's Avatar


 
Fleetwood Owners Club
Workhorse Chassis Owner
Join Date: Sep 2010
Location: Marquette, Michigan "Da UP" & Lehigh Acres Fl
Posts: 21,368

I hope your problem gets remedied soon.
__________________
John & Cathy R.
06 Pace Arrow 38L Workhorse W24
08 14 Lincoln MKX AWD, 06 Lincoln Mark LT 4X4
See My Pace Arrow Upgrades
JohnRR is offline   Reply With Quote
Old 09-15-2013, 08:54 PM   #6
Registered User
 
Join Date: Mar 2013
Posts: 1,919
Hook up a fuel pressure gauge and monitor it while it happens. Does it occur if you go wide open throttle up to highway speeds. If you loose fuel pressure, it is possible to have induction backfires.
jamesrxx951 is offline   Reply With Quote
Old 09-15-2013, 09:03 PM   #7
Senior Member
 
Arch Hoagland's Avatar
 
Monaco Owners Club
Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 10,351
Don't know about the pops, other than a possible exhaust manifold leak.

However a loss of power can be caused by a dirty MAF sensor along with a dirty air filter. After cleaning my MAF my lower power and surging problems went away along with the O2 sensor warnings.

What year and how many miles are on your rig?
__________________
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
"May you live in interesting times."
Arch Hoagland is offline   Reply With Quote
Old 09-15-2013, 09:04 PM   #8
Senior Member
 
calhyatt's Avatar
 
Newmar Owners Club
Freightliner Owners Club
Join Date: Mar 2012
Location: Weston, Fl.
Posts: 916
Quote:
Originally Posted by kruzer55 View Post
Hope someone can help me on this very challenging problem. Love our Winnebago and everything has been great until about two years ago on a trip. The engine runs great on flat ground and gets anywhere between 8-10 miles per gallon.
Now the engine pops loudly and looses power on a climb. As soon as I start a hill and the motor has a load on it it starts.
I have done just about everything I can can think of: plugs, plug wires, fuel filer, compression, emptied tank and put in 92 non ethenol in it, lots of additives, cps.
I've had two reputable mechanics ride me and put their portable scanners on the engine. No fault codes of any kind.
Has anyone else had this problem and fixed it?
Intake leak is my guess. Related to throttle position and manifold pressure...Will it do it on a flat surface when you go to WOT?
__________________
2003 Newmar Kountry Star 3905, Freightliner XC chassis with CAT 330. Winnie the black lab, pretty Airbus captain wife, retired airline pilot with 11 grandkids. UH-1 pilot (Huey) U.S. Army 1967-1983. RVN 68-69. Northern Idaho my summer home.
calhyatt is offline   Reply With Quote
Old 09-16-2013, 09:08 AM   #9
Senior Member/RVM #90
 
MSHappyCampers's Avatar


 
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 44,557
Hi and Welcome to IRV2! We're sure glad you joined us!

Sorry I can't help with your problem.

Good luck, happy trails, and God bless!
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
MSHappyCampers is offline   Reply With Quote
Old 09-16-2013, 04:35 PM   #10
Junior Member
 
Join Date: Sep 2013
Posts: 5
8.1 Chevy pops and looses power on grades answers

Thank you for trying to help me on this very challenging problem.
1. For Skip 426.....yes it is a continual popping noise coming (I think) out of the intake manifold. Also, as I drive along I feel a little buffeting. Yes I've checked the Mass Air Flow. EGR is good. As far as intake manifold vacuum I don't know on that one, but my fuel pressure was at 52 lbs. and holding.

2. For JMHO.....42,000 on the engine. Pulled valve springs on lowest compression cylinder all above 160-165. Valve springs to speck. Not broken on #2 cylinder. Don't know if I have a sticky intake valve. Good compression on all cylinders.

3. For DMorgan 6375......Coils: Haven't done that step yet. Don't know how to test. No error codes. Very expensive to replace all of them. Any suggestions?

4. For James rxx951......We did the fuel pressure monitor. Yep! Pops like crazy at full throttle. Fuel pressure stayed above 52 lbs.

5. For Arch Hoagland.....42,000 miles. 2001 Winnebago Adventurer. Only affected when warm outside and going up a steep grade. MAF checked. I will check my air filter.

6. For Calhyatt.....It will when it is hot.

I really appreciate all of you trying to help me on this. We are in Grass Valley and on vacation. Concerned about heading home and going up 3 summits with Ashland being the highest on I-5.

Is 52 lbs. plus adequate? I'm at my end. Can't figure this out. I was assured my crank shaft positioning sensor (which I replaced) would solve it. To no avail.
The thing that really puzzles me is I ran for 200 miles, up two summits going south to California with absolutely perfect running. As soon as I started up the Shasta summit with the outside temperature up it started popping and progressively got worst. Needless to say I am stumped....
Lonnie Tharp














Quote:
Originally Posted by kruzer55 View Post
Hope someone can help me on this very challenging problem. Love our Winnebago and everything has been great until about two years ago on a trip. The engine runs great on flat ground and gets anywhere between 8-10 miles per gallon.
Now the engine pops loudly and looses power on a climb. As soon as I start a hill and the motor has a load on it it starts.
I have done just about everything I can can think of: plugs, plug wires, fuel filer, compression, emptied tank and put in 92 non ethenol in it, lots of additives, cps.
I've had two reputable mechanics ride me and put their portable scanners on the engine. No fault codes of any kind.
Has anyone else had this problem and fixed it?
kruzer55 is offline   Reply With Quote
Old 09-16-2013, 06:51 PM   #11
Registered User
 
Join Date: Aug 2013
Posts: 245
Map sensor maybe?
jasright is offline   Reply With Quote
Old 09-16-2013, 06:52 PM   #12
Registered User
 
Join Date: Aug 2013
Posts: 245
Is the "Check Engine"light on?
jasright is offline   Reply With Quote
Old 09-16-2013, 07:26 PM   #13
Junior Member
 
Join Date: Sep 2013
Posts: 5
MAP sensor has been checked. Thank you.




Quote:
Originally Posted by jasright View Post
Map sensor maybe?
kruzer55 is offline   Reply With Quote
Old 09-16-2013, 07:27 PM   #14
Junior Member
 
Join Date: Sep 2013
Posts: 5
No. the check Engine Light has never come on. Nothing makes much sense. Thank you.



Quote:
Originally Posted by jasright View Post
Is the "Check Engine"light on?
kruzer55 is offline   Reply With Quote
Reply

Tags
power, chevy



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -6. The time now is 10:15 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.