RV.Net Open Roads Forum: Class C Motorhomes: New Onan 4000 wont start

RV Blog

  |  

RV Sales

  |  

Campgrounds

  |  

RV Parks

  |  

RV Club

  |  

RV Buyers Guide

  |  

Roadside Assistance

  |  

Extended Service Plan

  |  

RV Travel Assistance

  |  

RV Credit Card

  |  

RV Loans

Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Class C Motorhomes

Open Roads Forum  >  Class C Motorhomes  >  Class C

 > New Onan 4000 wont start

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 3  
Prev
Sponsored By:
awesomeman

Florida

New Member

Joined: 02/20/2018

View Profile


Offline
Posted: 03/06/19 04:22pm Link  |  Quote  |  Print  |  Notify Moderator

Well fudge me.....changed spark plug, oil, and air filter. Nada. Trouble code 36. All leads and voltages are solid. Cmon guys I need some ideas

bukhrn

Lanexa, Va

Senior Member

Joined: 03/20/2005

View Profile



Good Sam RV Club Member

Offline
Posted: 03/06/19 05:37pm Link  |  Quote  |  Print  |  Notify Moderator

Probably means nothing in your case but, on our first trip to Yellowstone, our Onan started, then quit, did it a couple times, while looking around, I noticed the altimeter setting was set at the lowest setting, in Yellowstone we were at 6000ft +/-, soon as I reset it to 5000+ it started & ran without a problem. [emoticon]


2007 Forester 2941DS
2014 Ford Focus
Zamboni, Long Haired Mini Dachshund
You can have my RV, when you pry my cold dead fingers from the Steering Wheel


youracman

Denver, CO

New Member

Joined: 06/04/2018

View Profile


Offline
Posted: 03/06/19 10:49pm Link  |  Quote  |  Print  |  Notify Moderator

awesomeman wrote:

Well fudge me.....changed spark plug, oil, and air filter. Nada. Trouble code 36. All leads and voltages are solid. Cmon guys I need some ideas


The only time my 4K Onan cranked but refused to start, it turned out to be the magneto. I discovered the bad mag by holding the plug against the Onan body (cooling fins IIRC) whilst it ..... no spark. A new mag assembly and it has run fine ever since. But then mine is 12 years old; has approx 500 hours on it and had lived down near the Calif beach for a several years before I bought it (the OEM mag turned out to be very corroded.)

Even though your Onan is almost new by comparison, I would VERIFY it has spark. If it passes the spark test, at least you know you probably need to concentrate on fuel delivery (and not just to the carb inlet....to the cylinder.)

Just my $.02

Good luck......know it is frustrating.


Ed Sievers, Denver, CO
07 WGO Outlook 31-C; '16 Kia Soul with 6spd DIY Tranny
"Be the person you needed when you were younger"


youracman

Denver, CO

New Member

Joined: 06/04/2018

View Profile


Offline
Posted: 03/06/19 10:52pm Link  |  Quote  |  Print  |  Notify Moderator

Ooops! Should say ".....whilst cranking it" Getting late....past my bedtime. lol

ed s

awesomeman

Florida

New Member

Joined: 02/20/2018

View Profile


Offline
Posted: 03/09/19 09:05am Link  |  Quote  |  Print  |  Notify Moderator

New update. I drained the carb. Got it to crank up but was rough idle. Actually not rough as it was pulsating. It stalled out after 5 minutes and now stalls right out after starting. Going to try more carb cleaner and clean the fuel lines. Got code 15 and 36. Any input?

Gjac

Milford, CT

Senior Member

Joined: 08/16/2006

View Profile



Good Sam RV Club Member

Offline
Posted: 03/14/19 09:08am Link  |  Quote  |  Print  |  Notify Moderator

I assume it has spark because it starts, I would still pull a plug and see if the spark will jump at least 1/4 in to ground and is nice and bright to rule out ignition problems. I would then disconnect fuel line to carb remove air cleaner and spray gas or carb cleaner into carb and see if it stays running if so I would suspect a fuel delivery problem. I have had two intermittent problems that drove me crazy like that. One was just a bad 12v connection to the fuel pump, the other was the pick up tube going to the fuel tank. I am sure yours in not cracked or rotted but it can be loose do to someone not tightening the hose clamp. Also you can remove the jets and spray the holes. You manual will tell you how many turns to open each one as an initial setting. Being this new I would think it is something simple. Also try disconnecting the sensors to see if that helps. If you try these things and report back you will get better suggestions.

* This post was edited 03/14/19 09:17am by Gjac *

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 3  
Prev

Open Roads Forum  >  Class C Motorhomes  >  Class C

 > New Onan 4000 wont start
Search:   Advanced Search

Search only in Class C Motorhomes


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:

© 2019 CWI, Inc. © 2019 Good Sam Enterprises, LLC. All Rights Reserved. | Terms of Use | PRIVACY POLICY | YOUR PRIVACY RIGHTS