Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > POWER TRAIN GARAGE FORUMS > Cummins Engines
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
 
Thread Tools Search this Thread Display Modes
 
Old 09-16-2020, 07:39 PM   #1
Senior Member
 
deandec's Avatar
 
Country Coach Owners Club
Join Date: Jan 2006
Location: Northern California
Posts: 5,526
8.3 Cummins Mechanical Throttle Position Sensor

Where should I look for this component?

Anyone have a photo of what it looks like?

Or, do I even have one?

TIA for any help.
__________________
Dean
1995 38' CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
Gillig Bus Chassis 05 Jeep Wk
deandec 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 09-16-2020, 07:55 PM   #2
Senior Member
 
Bob_C's Avatar
 
Join Date: May 2017
Location: Vancouver Wash
Posts: 7,230
Google your question for a quick response...forum has been a little slow....
Bob_C is offline   Reply With Quote
Old 09-16-2020, 09:16 PM   #3
Senior Member
 
deandec's Avatar
 
Country Coach Owners Club
Join Date: Jan 2006
Location: Northern California
Posts: 5,526
Quote:
Originally Posted by bob caldwell View Post
Google your question for a quick response...forum has been a little slow....
I have a lot of Google search experience.

No answer has been found with my efforts.
__________________
Dean
1995 38' CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
Gillig Bus Chassis 05 Jeep Wk
deandec is offline   Reply With Quote
Old 09-16-2020, 09:18 PM   #4
Senior Member
 
Bob_C's Avatar
 
Join Date: May 2017
Location: Vancouver Wash
Posts: 7,230
I know smaller engines do.....found them advertised in a catalog....
Bob_C is offline   Reply With Quote
Old 09-16-2020, 09:22 PM   #5
Senior Member
 
Ray,IN's Avatar
 
Join Date: Aug 2001
Location: North America somewhere
Posts: 24,989
Most drive-by-wire diesels have the TPS on the accelerator pedal. If yours is cable-controlled it should be on the injector pump.
__________________
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
Ray,IN is offline   Reply With Quote
Old 09-17-2020, 09:14 AM   #6
Senior Member
 
deandec's Avatar
 
Country Coach Owners Club
Join Date: Jan 2006
Location: Northern California
Posts: 5,526
Thanks for the drive by wire answer. Perhaps similar to my Air Throttle?
__________________
Dean
1995 38' CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
Gillig Bus Chassis 05 Jeep Wk
deandec is offline   Reply With Quote
Old 09-17-2020, 09:23 AM   #7
Senior Member
 
deandec's Avatar
 
Country Coach Owners Club
Join Date: Jan 2006
Location: Northern California
Posts: 5,526
Thanks for the drive by wire answer. Perhaps similar to my Air Throttle?

Here is a photo of the linkage portion of the fuel system.


Click image for larger version

Name:	2018-03-24 12.38.58.jpg
Views:	153
Size:	416.8 KB
ID:	301328
__________________
Dean
1995 38' CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
Gillig Bus Chassis 05 Jeep Wk
deandec is offline   Reply With Quote
Old 09-17-2020, 05:54 PM   #8
Senior Member
 
deandec's Avatar
 
Country Coach Owners Club
Join Date: Jan 2006
Location: Northern California
Posts: 5,526
I found the TPS on my C8.3L

Well, I took a longer look at my old Gillig Parts Manual. It has detailed exhibits for the Air Throttle & Cruise Control System as well as the Transmission Shifting System.

On the Transmission is a bracket that holds the Throttle Position Sensor.

It appears to connect to the rubber billows type TPS link in the picture below.

Click image for larger version

Name:	2018-03-24 12.39.04.jpg
Views:	117
Size:	312.6 KB
ID:	301375

I have had some shifting problems that I suspect are due to the TPS function.

Perhaps that collapsed rubber billows in the picture has to be positioned in a straight line like the exhibit shows and not as it currently positioned..

Will post back when I have corrected the positioning and test driven the rig.
__________________
Dean
1995 38' CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
Gillig Bus Chassis 05 Jeep Wk
deandec is offline   Reply With Quote
Old 11-11-2020, 06:52 PM   #9
Senior Member
 
deandec's Avatar
 
Country Coach Owners Club
Join Date: Jan 2006
Location: Northern California
Posts: 5,526
Todays Experience on TPS link

I disconnected the throttle linkage to which the TPS billows link is attached (pictured in my prior post).

After cleaning and lubing all the sliding parts and reconnecting them, I now have a sprightly shifting experience from 1st to 5th gear. (never got to 60 mph and 6th gear)

The billows also sits more straight line than it did before disassembly.

No guarantee this is the final "fix" but I am pleasantly encouraged.....

This is a two year issue that may have started with the throttle linkage becoming disconnected while crossing the San Mateo Bridge in SFO area.

Because my throttle is an "Air Throttle" it may be different from other Cummins linkage of the same vintage.
__________________
Dean
1995 38' CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
Gillig Bus Chassis 05 Jeep Wk
deandec is offline   Reply With Quote
Old 11-14-2020, 01:41 PM   #10
Senior Member
 
Join Date: Sep 2016
Location: Sarasota, FL
Posts: 5,082
I guess I'm confused Dean. Both pictures look the same. Are you saying the TPS connects inside the billows portion?

Also, what do you mean by "Air throttle"? Do you not have a cable running from pedal to throttle?
__________________
Rick and Larrie Dee
1997 40' Newmar London Aire DP CTA 8.3 (Mechanical) 325 Spartan MM
Bringing her back to her glory.
'08 Jeep GC Overland.
RKins is offline   Reply With Quote
Old 11-14-2020, 02:19 PM   #11
Senior Member
 
deandec's Avatar
 
Country Coach Owners Club
Join Date: Jan 2006
Location: Northern California
Posts: 5,526
Quote:
Originally Posted by RKins View Post
I guess I'm confused Dean. Both pictures look the same. Are you saying the TPS connects inside the billows portion?

Yes, as mentioned in an earlier post, the TPS is in a bracket on the tranmission case.

Its connection to the engine throttle appears to be inside the billows in the picture.


Also, what do you mean by "Air throttle"? Do you not have a cable running from pedal to throttle?
My rig's acceleration is controlled with compressed air at the accelerator pedal.

If the compressed air is not above @ 60psi with the engine running there is no input to the engine throttle from the accelerator pedal in the cab.

I have not identified how it links to the throttle.

This feature can hinder a fast getaway......


Note: this is a Gillig Chassis thing I understand.
__________________
Dean
1995 38' CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
Gillig Bus Chassis 05 Jeep Wk
deandec is offline   Reply With Quote
Old 11-15-2020, 07:32 PM   #12
Senior Member
 
deandec's Avatar
 
Country Coach Owners Club
Join Date: Jan 2006
Location: Northern California
Posts: 5,526
Diagram of an Air Throttle

Air Throttle

Here is a simple diagram of an Air Throttle for those that might be interested.
__________________
Dean
1995 38' CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
Gillig Bus Chassis 05 Jeep Wk
deandec is offline   Reply With Quote
Old 11-16-2020, 08:27 PM   #13
Senior Member
 
Ray,IN's Avatar
 
Join Date: Aug 2001
Location: North America somewhere
Posts: 24,989
Thank you for explaining the air throttle Dean! I have learned something new today. Sorry I didn't get back to you, for some reason I had stopped getting notifications for a while, corrected that in my preferences selections.
It's great you found the problem and the solution.
__________________
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
Ray,IN is offline   Reply With Quote
Old 11-20-2020, 06:54 AM   #14
Senior Member
 
Join Date: Sep 2016
Location: Sarasota, FL
Posts: 5,082
Yup I learned something new also. I might have to dig deeper into that product.
__________________
Rick and Larrie Dee
1997 40' Newmar London Aire DP CTA 8.3 (Mechanical) 325 Spartan MM
Bringing her back to her glory.
'08 Jeep GC Overland.
RKins is offline   Reply With Quote
Reply

Tags
cummins, mechanic



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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Throttle position sensor lenp Class A Motorhome Discussions 15 08-19-2014 01:40 PM
Throttle Position Sensor MD3060 Piker Allison Transmission Forum 27 02-05-2014 03:17 PM
'08 Camelot Throttle Position Sensor Problem Silent Service Monaco Owner's Forum 7 06-10-2012 09:29 AM
Throttle Position Sensor hardcanuck Allison Transmission Forum 2 08-27-2009 09:28 PM
Throttle position sensor 2008 w/425 Cummins Melorene Alpine Coach Owner's Forum 4 07-29-2009 10:31 AM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 06:29 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.