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

Go Back   Thor Forums > Thor Motorcoach & Motorhome > Class A Motor Coach
Click Here to Login
Thread Tools Display Modes
Old 11-06-2015, 05:55 AM   #1
Junior Member
Brand: Thor Motor Coach
Model: Hurricane 27k
State: Arkansas
Posts: 19
THOR #1759
Send a message via Skype™ to PEHetzer
Smile Loping Engine - Thor Hurricane

Our last trip took us from Las Vegas to Denver via HWY 70 which is a meandering 2-lane freeway through the mountains of Colorado. As we passed through the mountains we ran into a snow storm that powered the freeway with a couple of inches of snow. It was a white-knuckled trip following a semi-truck most of the way into Denver.
Prior to this we had left Arkansas to see the Grand Canyon and then onto Las Vegas where we would have the opportunity to visit with friends. Our RV, a Thor Hurricane, worked flawlessly and the trip to Las Vegas was a joy. We were doing fine until we were at the highest pass on Hwy 70 which was recorded to be at an elevation of 10,600 ft. when suddenly, the engine started to lope. The engine would act as if the accelerator was momentarily released every ½ second or so. When I tried to accelerate the problem became much worse, but when I eased the throttle down and limited my acceleration, then the problem abated somewhat, but was still noticeable.
After reaching the RV Park, I spent a day reading the lousy manual that Thor gave me in an attempt to discover what might be happening. I knew that it was not an electrical problem and I knew that it was not a fuel problem because the loping characteristic was even and didn’t change with RPM’s. While studying the Ford engine manual, I discovered on page 82-83 that if one changed a chassis battery that the transmission and the engine would have to relearn how to operate, which convinced me that there is a computer that controls both the engine and the transmission. The engine manual has a set of instructions on what to do to assist in the relearning event.
With the thought that nothing ventured is nothing gained, I disconnected the chassis battery. I then disconnected all power to the coach and put the coach into its “store” mode. To assure that there was no power active power I turned the headlight switch to full on and assured myself that there was no power going to the chassis or the coach. After ten (10) minutes, I reconnected the coach power and turned the coach into its “use” mode.
At this time it was interesting to note that the headlights started to operate. Also, a driving test revealed that the loping problem was gone. Wed drove from Denver back to Arkansas without further problems. Hope this information might help onother .... Paul Hetzer

PEHetzer is offline   Reply With Quote
Old 11-06-2015, 01:07 PM   #2
Axis/Vegas Enthusiast
JamieGeek's Avatar
Brand: Thor Motor Coach
Model: Axis 24.1
State: Michigan
Posts: 9,030
THOR #1150
Yes the engine and trans are controlled by computer. Even more interesting: The throttle is controlled by the computer as well (throttle "by wire").

When reading your story I was suspecting either the foot pedal position sensor or the throttle position sensor but since you were able to clear things up by rebooting the system (so to speak) perhaps you found an odd corner case in the ECU code. (Although I find that somewhat surprising given that the engine controllers are usually rock solid--especially when you consider the lead time of the software and how long it took to get that technology in to RVs.)

Glad to hear you got it sorted out...

2014 Thor Axis 24.1
2018 Chevy Bolt
blog - https://spareelectrons.wordpress.com/
JamieGeek is offline   Reply With Quote
Old 11-06-2015, 01:17 PM   #3
Senior Member
Brand: Thor Motor Coach
State: Florida
Posts: 1,031
THOR #1249
Glad you found the reason for your engine loping. Interesting that it occurred at the higher elev.
Thanks for the info and I will add it to my trouble shooting file.
2015 Thor Vegas 24.1 in Ocala
mcr1010 is offline   Reply With Quote
Old 11-06-2015, 02:23 PM   #4
Senior Member
Brand: Thor Motor Coach
Model: Hurricane 34E
State: California
Posts: 524
THOR #937
It is refreshing to read about an actual solution to a problem! By an owner!
Beacher is offline   Reply With Quote
Old 11-07-2015, 06:58 AM   #5
Senior Member
fivejackie's Avatar
Brand: Thor Motor Coach
Model: Hurricane 27K
State: California
Posts: 121
THOR #1226
Thanks for your solution to the problem. This is a little scary having a computer controlling all the functions of your driving.
Thanks again,
Don and Jackie

2015 Hurricane 27K
2013 Redhawk
1988 Pace Arrow
fivejackie is offline   Reply With Quote

Thread Tools
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

» Featured Campgrounds

Reviews provided by


This website is not affiliated with or endorsed by Thor Industries or any of its affiliates. This is an independent, unofficial site.

All times are GMT. The time now is 05:23 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0 PL2