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Engine Discussion of preventative/corrective maintenance and other technical issues regarding your coach's engine.

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  #1  
Old 10-01-2022
Debugjaws Debugjaws is offline
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Default DDEC II 91 WB Code

Guys - were on the road to get to WOG (making some stops on the way). I’ve had the check engine light come on a couple of times recently, including this morning. We still have a couple thousand miles to go. My silver leaf records the following … “code 104 2 boost pressure low voltage” … (see pic). Again, we’re traveling on the road. Is this something to worry about? It usually comes on at first start up and then goes away shortly thereafter, or if I shut the engine down and restart.

Looking forward to meeting you all at WOG.

Thanks for your help!

Gerry
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Gerry Lefebvre
Newberg, Oregon
91 WB 40'
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  #2  
Old 10-01-2022
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Dieselbird01 Dieselbird01 is offline
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Quote:
Originally Posted by Debugjaws View Post
Guys - were on the road to get to WOG (making some stops on the way). I’ve had the check engine light come on a couple of times recently, including this morning. We still have a couple thousand miles to go. My silver leaf records the following … “code 104 2 boost pressure low voltage” … (see pic). Again, we’re traveling on the road. Is this something to worry about? It usually comes on at first start up and then goes away shortly thereafter, or if I shut the engine down and restart.

Looking forward to meeting you all at WOG.

Thanks for your help!

Gerry
I would check the hose going to the Turbo Boost Sensor (TBS) (also known as the MAP sensor). Next, I would check and clean the electrical connector that plugs into the Turbo Boost Sensor and the pins on the Turbo Boost Sensor itself. If that doesn't help, the Turbo Boost Sensor may be going bad.
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John Wyatt
Titusville, Florida
1991 40' WLWB-WTB 8V92
Body Number F095567
My Location: http://www.bbirdmaps.com/user1.cfm?user=4

1991 40' WB ...From 2008 - Present
1984 ½ PT-36 .From 2000 - 2008
1973 FC-31 .....From 1991 - 2001

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  #3  
Old 10-02-2022
Alfa Alfa is offline
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I have a DDEC I engine, but I had the equivalent code when the electrical connection to the map sensor vibrated out. I zip tied the connector back on. I am a master with zip ties...

I knew that the connector was really brittle and broken up, and I had intended on replacing it for a while, so I already had the parts. Took about 5 minutes to cut out the old one and crimp on a new one. It was a very satisfying fix.

The map sensor should be on the back of the engine, right below the turbo. Easiest way to make sure, is to follow the 1/4" line that comes out of the curb side of the supercharger on the top of the engine as it plugs in directly to the MAP sensor.

DDEC II should be a GM Type 3 bar sensor. Easy to find in most auto parts stores.
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Diego Alfarache
Austin, Texas
1988 WB40
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  #4  
Old 10-02-2022
Debugjaws Debugjaws is offline
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Originally Posted by Dieselbird01 View Post
I would check the hose going to the Turbo Boost Sensor (TBS) (also known as the MAP sensor). Next, I would check and clean the electrical connector that plugs into the Turbo Boost Sensor and the pins on the Turbo Boost Sensor itself. If that doesn't help, the Turbo Boost Sensor may be going bad.

Excellent call John. Once again you're spot on. I could see the hose had a rupture on the top of it right at the end of the barbed nipple at the housing. When I reached in to assess it, it snapped right off. Clearly that was the issue. I happened to have a length of the same size hose with me. The original appeared to be rubber with a fiber/ cloth for of wrap. I happened to have a length of the same size rubber hose, and also some metal tape used for wrapping Turbo components that I've hung on to for nearly 30 years. I tightly wrapped the hose in the tape and installed using hose clamps on either end.

Clearly it has been an issue for a while. I couldn't believe the power, even going up hills with the cruise on it held speed. I had to work to keep my foot out of it. It's never run this good before.
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Gerry Lefebvre
Newberg, Oregon
91 WB 40'
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  #5  
Old 10-02-2022
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That is good to hear Gerry. I have a couple of rolls of that stuff in my shop, but not in my bus. I will be putting one of them in the bus tomorrow. Hope to see you next week.
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2000 LX ME 2020 to Present
'93 WLWB 2008 to 2020
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  #6  
Old 10-02-2022
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Sounds like you found the problem.

Hope to see you at WOG.
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John Wyatt
Titusville, Florida
1991 40' WLWB-WTB 8V92
Body Number F095567
My Location: http://www.bbirdmaps.com/user1.cfm?user=4

1991 40' WB ...From 2008 - Present
1984 ½ PT-36 .From 2000 - 2008
1973 FC-31 .....From 1991 - 2001

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  #7  
Old 10-03-2022
Debugjaws Debugjaws is offline
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Quote:
Originally Posted by isp2952 View Post
That is good to hear Gerry. I have a couple of rolls of that stuff in my shop, but not in my bus. I will be putting one of them in the bus tomorrow. Hope to see you next week.
Like I said, I had it for 30 years. I finally used it!

See you next week.
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Gerry Lefebvre
Newberg, Oregon
91 WB 40'
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  #8  
Old 10-03-2022
Alfa Alfa is offline
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I replaced my hose on the road. I think I used reinforced 1/4" fuel line from a NAPA somewhere. Maybe Alamogordo, NM.

Always fun to meet new people at the NAPAs.
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Diego Alfarache
Austin, Texas
1988 WB40
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  #9  
Old 10-03-2022
DirtDigger DirtDigger is offline
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Ah geez, something else to now look at and replace, lol. Plus like Jim, tossing a roll of that tape into the bin of stuff
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Tim and Nadine Parmenter
Henryville, IN (Louisville, KY area)
1988 WBWL #3907
Serial #79235
8v92 DDEC1
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  #10  
Old 10-04-2022
Alfa Alfa is offline
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Ah geez, something else to now look at and replace, lol. Plus like Jim, tossing a roll of that tape into the bin of stuff
And zip ties of all sizes!
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Diego Alfarache
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1988 WB40
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