Home » Public Forums » GMCnet » My Onan runs like Sheet: Episode III, WTF is wrong with this thing!?
| My Onan runs like Sheet: Episode III, WTF is wrong with this thing!? [message #81937] |
Mon, 26 April 2010 11:19  |
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Well, here is my latest installment of the ongoing saga of trying to get my green turd, which formerly performed flawlessly to again run properly.
Well taking the advice of many here I decarbonized the heads on the Onan, without a bead blasting cabinent this takes a couple hours to soak the heads in carby dip and scrub, and scrape the hardened crap off the heads, and recondition the gaskets for reuse.
Upon reinstalling the heads I fired up the onan, and adjusted the carb. It ran better, but still stumbled and stammered occationally...
Saturday I received another coil and carb from Michael at GMCRecs for trouble shooting purposes. I installed the other coil and performance did improve some, but still no dice as to eliminating the wandering stumble. so I tried the carb, again no change, but at least I eliminated these as causes. with the new coil the Onan still emits its EM feild so I'm wondering if this is just normal for the Onan? maybe if someone else who has a DMM can try to test a running onan can tell me if their unit starts acting strangely...
I pulled the points, and check them, regapped them, and reinstalled. this time the onan ran fine for 20 minutes. I shut it down to finanlize some other stuff and when I restarted the onan again it started stumbling and stammering like before.
finally I noticed I was having trouble getting it started and the start switch seemed to not function. so I yanked the covers on the relays on the control board, it sems they are having problems functioning correctly after some messing around with the contacts I finally got it to fire up again. At this point I should mention that in previous tests I had hotwired the control board with the 9-11 jumper to eliminate the board compleatly.
Im beginning to think the relays may be geting faulty on my board, would this cause the engine to intermittently stumble and stammer?
I'm wondering also if there is maybe something mechanical I missed in the engine itself? im thinking maybe valve tappets need adjusting? how hard is that to do?
73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
[Updated on: Mon, 26 April 2010 11:19] Report message to a moderator |
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| Re: [GMCnet] My Onan runs like Sheet: Episode III, WTF is wrong with this thing!? [message #82070 is a reply to message #81937] |
Tue, 27 April 2010 08:53  |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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Shan,
Duane charges $100 plus your old board for one of his upgraded, OEM
boards. It is a darn good deal. If you are having trouble contacting
him I have one of his boards that I have not installed and I can send
it to you but you must replace it at your earliest.
On Mon, Apr 26, 2010 at 9:19 AM, Shan Rose <defconfx@gmail.com> wrote:
>
>
> Well, here is my latest installment of the ongoing saga of trying to get my green turd, which formerly pweformed flawlessly to again run properly.
>
>
> Well taking the advice of many here I decarbonized the heads on the Onan, without a bead blasting cabinent this takes a couple hours to soak the heads in carby dip and scrub, and scrape the hardened crap off the heads, and recondition the gaskets for reuse.
>
> Upon reinstalling the heads I fired up the onan, and adjusted the carb. It ran better, but still stumbled and stammered occationally...
>
>
> Saturday I received another coil and carb from Michael at GMCRecs for trouble shooting purposes. I installed the other coil and performance did improve some, but still no dice as to eliminating the wandering stumble. so I tried the carb, again no change, but at least I eliminated these as causes. with the new coil the Onan still emits its EM feild so I'm wondering if this is just normal for the Onan? maybe if someone else who has a DMM can try to test a running onan can tell me if their unit starts acting strangely...
>
> I pulled the points, and check them, regapped them, and reinstalled. this time the onan ran fine for 20 minutes. I shut it down to finanlize some other stuff and when I restarted the onan again it started stumbling and stammering like before.
>
> finally I noticed I was having trouble getting it started and the start switch seemed to not function. so I yanked the covers on the relays on the control board, it sems they are having problems functioning correctly after some messing around with the contacts I finally got it to fire up again. At this point I should mention that in previous tests I had hotwired the control board with the 9-11 jumper to eliminate the board compleatly.
>
> Im beginning to think the relays may be geting faulty on my board, would this cause the engine to intermittently stumble and stammer?
>
> I'm wondering also if there is maybe something mechanical I missed in the engine itself? im thinking maybe valve tappets need adjusting? how hard is that to do?
>
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] My Onan runs like Sheet: Episode III, WTF is wrong with this thing!? [message #82264 is a reply to message #82070] |
Wed, 28 April 2010 11:32 |
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I might just take you up on that offer Steve, I tried to send you a PM but it said you are not accepting them. what does Duane update on the boards exactly?
| Steven Ferguson wrote on Tue, 27 April 2010 08:53 |
Shan,
Duane charges $100 plus your old board for one of his upgraded, OEM
boards. It is a darn good deal. If you are having trouble contacting
him I have one of his boards that I have not installed and I can send
it to you but you must replace it at your earliest.
On Mon, Apr 26, 2010 at 9:19 AM, Shan Rose <defconfx@gmail.com> wrote:
>
>
> Well, here is my latest installment of the ongoing saga of trying to get my green turd, which formerly pweformed flawlessly to again run properly.
>
>
> Well taking the advice of many here I decarbonized the heads on the Onan, without a bead blasting cabinent this takes a couple hours to soak the heads in carby dip and scrub, and scrape the hardened crap off the heads, and recondition the gaskets for reuse.
>
> Upon reinstalling the heads I fired up the onan, and adjusted the carb. It ran better, but still stumbled and stammered occationally...
>
>
> Saturday I received another coil and carb from Michael at GMCRecs for trouble shooting purposes. I installed the other coil and performance did improve some, but still no dice as to eliminating the wandering stumble. so I tried the carb, again no change, but at least I eliminated these as causes. with the new coil the Onan still emits its EM feild so I'm wondering if this is just normal for the Onan? maybe if someone else who has a DMM can try to test a running onan can tell me if their unit starts acting strangely...
>
> I pulled the points, and check them, regapped them, and reinstalled. this time the onan ran fine for 20 minutes. I shut it down to finanlize some other stuff and when I restarted the onan again it started stumbling and stammering like before.
>
> finally I noticed I was having trouble getting it started and the start switch seemed to not function. so I yanked the covers on the relays on the control board, it sems they are having problems functioning correctly after some messing around with the contacts I finally got it to fire up again. At this point I should mention that in previous tests I had hotwired the control board with the 9-11 jumper to eliminate the board compleatly.
>
> Im beginning to think the relays may be geting faulty on my board, would this cause the engine to intermittently stumble and stammer?
>
> I'm wondering also if there is maybe something mechanical I missed in the engine itself? im thinking maybe valve tappets need adjusting? how hard is that to do?
>
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
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| Re: [GMCnet] My Onan runs like Sheet: Episode III, WTF is wrong with this thing!? [message #82329 is a reply to message #82264] |
Wed, 28 April 2010 18:01 |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
|
Senior Member |
|
|
I think he replaced all of the outdated components with state of the
art ones. Relays, etc. I'll add your address to my book and you
should be able to get through.
Otherwise, botiemad11@juno.com should work
On Wed, Apr 28, 2010 at 9:32 AM, Shan Rose <defconfx@gmail.com> wrote:
>
>
> I might just take you up on that offer Steve, I tried to send you a PM but it said you are not accepting them. what does Duane update on the boards exactly?
>
> Steven Ferguson wrote on Tue, 27 April 2010 08:53
>> Shan,
>> Duane charges $100 plus your old board for one of his upgraded, OEM
>> boards. It is a darn good deal. If you are having trouble contacting
>> him I have one of his boards that I have not installed and I can send
>> it to you but you must replace it at your earliest.
>>
>> On Mon, Apr 26, 2010 at 9:19 AM, Shan Rose <defconfx@gmail.com> wrote:
>> >
>> >
>> > Well, here is my latest installment of the ongoing saga of trying to get my green turd, which formerly pweformed flawlessly to again run properly.
>> >
>> >
>> > Well taking the advice of many here I decarbonized the heads on the Onan, without a bead blasting cabinent this takes a couple hours to soak the heads in carby dip and scrub, and scrape the hardened crap off the heads, and recondition the gaskets for reuse.
>> >
>> > Upon reinstalling the heads I fired up the onan, and adjusted the carb. It ran better, but still stumbled and stammered occationally...
>> >
>> >
>> > Saturday I received another coil and carb from Michael at GMCRecs for trouble shooting purposes. I installed the other coil and performance did improve some, but still no dice as to eliminating the wandering stumble. so I tried the carb, again no change, but at least I eliminated these as causes. with the new coil the Onan still emits its EM feild so I'm wondering if this is just normal for the Onan? maybe if someone else who has a DMM can try to test a running onan can tell me if their unit starts acting strangely...
>> >
>> > I pulled the points, and check them, regapped them, and reinstalled. this time the onan ran fine for 20 minutes. I shut it down to finanlize some other stuff and when I restarted the onan again it started stumbling and stammering like before.
>> >
>> > finally I noticed I was having trouble getting it started and the start switch seemed to not function. so I yanked the covers on the relays on the control board, it sems they are having problems functioning correctly after some messing around with the contacts I finally got it to fire up again. At this point I should mention that in previous tests I had hotwired the control board with the 9-11 jumper to eliminate the board compleatly.
>> >
>> > Im beginning to think the relays may be geting faulty on my board, would this cause the engine to intermittently stumble and stammer?
>> >
>> > I'm wondering also if there is maybe something mechanical I missed in the engine itself? im thinking maybe valve tappets need adjusting? how hard is that to do?
>> >
>> >
>> >
>> >
>> >
>> > _______________________________________________
>> > GMCnet mailing list
>> > List Information and Subscription Options:
>> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>> >
>>
>>
>>
>> --
>> Steve Ferguson
>> '76 EII
>> Sierra Vista, AZ
>> Urethane bushing source
>> www.bdub.net/ferguson/
>> _______________________________________________
>> GMCnet mailing list
>> List Information and Subscription Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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