Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance 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 08-03-2020, 09:55 AM   #1
Junior Member
 
Holiday Rambler Owners Club
Spartan Chassis
Join Date: Feb 2018
Posts: 29
8.3 mechanical delayed start

Hi Guys,
We own a Ď95 HR with a 8.3 mechanical and MD3060 transmission. Over time it has been increasingly hard to start. When the key is turned on and the engine pre-heat light goes out, it still will not turn over. After 25 - 30 seconds I hear the contacts close in the Allison relay box located under the dash on the drivers side, and then it starts no problem. After it has started, it can be restarted no problem with only a slight delay. Yesterday it took 50 seconds before the relays kick in.Freightliner has gone thru the chassis and cannot identify the problem Which seems weird.
Does anybody out there have any ideas?
Appreciate any suggestions.
tbostrom 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 08-03-2020, 12:38 PM   #2
Senior Member
 
deandec's Avatar
 
Country Coach Owners Club
Join Date: Jan 2006
Location: Northern California
Posts: 5,326
I have the same equipment on a Gillig Bus chassis.

My rig has both an ignition solenoid and a starter solenoid.

If your schematics show the same configuration, my WAG would be that your ignition solenoid is not engaging immediately with the key..

When my ignition solenoid failed, the transmission pad would not light up and I had a no crank problem.

Perhaps either the ignition solenoid is weak or has a poor ground (my situation).
__________________
Dean
1995 38' CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
Gillig Bus Chassis
deandec is offline   Reply With Quote
Old 08-03-2020, 07:23 PM   #3
Junior Member
 
Holiday Rambler Owners Club
Spartan Chassis
Join Date: Feb 2018
Posts: 29
Quote:
Originally Posted by deandec View Post
I have the same equipment on a Gillig Bus chassis.

My rig has both an ignition solenoid and a starter solenoid.

If your schematics show the same configuration, my WAG would be that your ignition solenoid is not engaging immediately with the key..

When my ignition solenoid failed, the transmission pad would not light up and I had a no crank problem.

Perhaps either the ignition solenoid is weak or has a poor ground (my situation).
Thanks deandec
I’ll check the connections and/or replace the starter solenoid and see if that the fix.
Will let you know.
tbostrom is offline   Reply With Quote
Old 08-04-2020, 03:36 PM   #4
Junior Member
 
Holiday Rambler Owners Club
Spartan Chassis
Join Date: Feb 2018
Posts: 29
Quote:
Originally Posted by deandec View Post
I have the same equipment on a Gillig Bus chassis.

My rig has both an ignition solenoid and a starter solenoid.

If your schematics show the same configuration, my WAG would be that your ignition solenoid is not engaging immediately with the key..

When my ignition solenoid failed, the transmission pad would not light up and I had a no crank problem.

Perhaps either the ignition solenoid is weak or has a poor ground (my situation).
Hi Dean,
Checked all the connections and replaced the ignition solenoid and still no improvement. Iím going back to Freightliner and try and get some answers.
Thanks for your suggestions tho as it only cost me $34.00.
tbostrom is offline   Reply With Quote
Old 08-13-2020, 10:24 PM   #5
Junior Member
 
Join Date: May 2017
Posts: 14
Delayed start

Check your batteries and all your connections. Sounds like the relay is getting low voltage because of the intake heater and the voltage is coming back up enough after 30 / 60 seconds to energize the relay. Mike
BIGBADDOG is offline   Reply With Quote
Old 08-15-2020, 09:31 AM   #6
Junior Member
 
Holiday Rambler Owners Club
Spartan Chassis
Join Date: Feb 2018
Posts: 29
Quote:
Originally Posted by BIGBADDOG View Post
Check your batteries and all your connections. Sounds like the relay is getting low voltage because of the intake heater and the voltage is coming back up enough after 30 / 60 seconds to energize the relay. Mike
Thanks for the tip Mike.
I thought the connections were good but will double check and see if that rectifies the problem. Your suggestion makes perfect sense. Ted.
tbostrom is offline   Reply With Quote
Old 08-15-2020, 09:59 AM   #7
Senior Member
 
deandec's Avatar
 
Country Coach Owners Club
Join Date: Jan 2006
Location: Northern California
Posts: 5,326
Does the delay occur when you activate the battery boost switch?
__________________
Dean
1995 38' CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
Gillig Bus Chassis
deandec is offline   Reply With Quote
Old 08-16-2020, 10:17 AM   #8
Junior Member
 
Holiday Rambler Owners Club
Spartan Chassis
Join Date: Feb 2018
Posts: 29
Yes, there is still a delay even when I use the battery boost switch. Itís odd cause once it starts, I can restart with only a minor delay like 2 seconds, even if the engine is cold. But if I wait 15 minutes and try to restart it will take 20 seconds or so for the relays to activate.
tbostrom is offline   Reply With Quote
Old 08-16-2020, 11:57 AM   #9
Senior Member
 
deandec's Avatar
 
Country Coach Owners Club
Join Date: Jan 2006
Location: Northern California
Posts: 5,326
The delay sounds like a fuel preheat cycle. I am not familiar with that on my engine, except on the generator start sequence.

On my dash there is a "wait to start" lighted warning if the air temps are below @ 40F degrees.

To overcome that, I think I need to turn on the ignition but not try to crank the engine until the light turns off.

Perhaps you have something similar for preheat that causes the delay until the engine thinks it is ready to start?

FWIW, my engine cranks immediately.
__________________
Dean
1995 38' CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
Gillig Bus Chassis
deandec is offline   Reply With Quote
Old 08-17-2020, 10:27 AM   #10
Junior Member
 
Holiday Rambler Owners Club
Spartan Chassis
Join Date: Feb 2018
Posts: 29
Quote:
Originally Posted by deandec View Post
The delay sounds like a fuel preheat cycle. I am not familiar with that on my engine, except on the generator start sequence.

On my dash there is a "wait to start" lighted warning if the air temps are below @ 40F degrees.

To overcome that, I think I need to turn on the ignition but not try to crank the engine until the light turns off.

Perhaps you have something similar for preheat that causes the delay until the engine thinks it is ready to start?

FWIW, my engine cranks immediately.
Yes, My original thoughts were that there was something wrong with the engine pre-heat system but Iím not sure were to look for a potential cause of the delay.
I had Freightliner look at it and spent $1800.00 to diagnose the problem with no results.....OUCH!
tbostrom is offline   Reply With Quote
Old 08-17-2020, 02:51 PM   #11
Senior Member
 
deandec's Avatar
 
Country Coach Owners Club
Join Date: Jan 2006
Location: Northern California
Posts: 5,326
I think I have the grid heater vs the flame start heater.

Here is a web page for the flame start, but it reads like the same procedure as the grid heater.

https://www.equipmanuals.com/blog/fl...-c8-3-engines/

Another diesel starting summary:

"There are several different options for starting diesels, and the best option for any particular engine depends on the design of the engine and any 'starting aids' it has. For a particular vehicle, your best option is to refer to the owner's manual for starting in various (hot/cold) conditions. If you have problems starting, it may be that the starting aids aren't working properly."


Perhaps your grid heater is blocking the start process.

Or, perhaps your chassis battery is not passing enough power to the heater as a previous poster suggested.

I am just flinging out possibilities maybe something will connect.
__________________
Dean
1995 38' CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
Gillig Bus Chassis
deandec is offline   Reply With Quote
Old 08-18-2020, 11:18 AM   #12
Junior Member
 
Holiday Rambler Owners Club
Spartan Chassis
Join Date: Feb 2018
Posts: 29
Quote:
Originally Posted by deandec View Post
I think I have the grid heater vs the flame start heater.

Here is a web page for the flame start, but it reads like the same procedure as the grid heater.

https://www.equipmanuals.com/blog/fl...-c8-3-engines/

Another diesel starting summary:

"There are several different options for starting diesels, and the best option for any particular engine depends on the design of the engine and any 'starting aids' it has. For a particular vehicle, your best option is to refer to the owner's manual for starting in various (hot/cold) conditions. If you have problems starting, it may be that the starting aids aren't working properly."


Perhaps your grid heater is blocking the start process.

Or, perhaps your chassis battery is not passing enough power to the heater as a previous poster suggested.

I am just flinging out possibilities maybe something will connect.

Thanks for the info Dean. Iím going to research this when I get back home. Weíre on a 3 week trip right now staying put for a week at a time.
This forum is great thanks to people like you.
tbostrom is offline   Reply With Quote
Reply

Tags
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
AC delayed start-up danes-on-tour RV Systems & Appliances 7 10-16-2013 01:36 PM
Delayed start warranty georgeb iRV2.com General Discussion 0 09-04-2011 09:50 AM
Workhorse "Delayed Warranty Start" Edouard Workhorse and Chevrolet Chassis Motorhome Forum 8 11-03-2010 04:23 PM
Warranty start date and Delayed mileage? abarkl Workhorse and Chevrolet Chassis Motorhome Forum 4 06-09-2006 08:45 AM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 02:49 PM.


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