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Old 09-03-2013, 02:48 PM   #1
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Engine cutting out?

So on this last labor day weekend we were on our way home when I noticed something I've never experienced before. We were on the hwy running about 65 to 70mph when I felt this slight lunge like when the transmission downshifts. Not a major jerking or anything but it kept happening every couple minutes or so. first thought was transmission and the sense of panic filled me. You know that warm feeling just before something bad happens? Anyway I started to eye ball the gages like a hawk and did not notice the RPMs changing when it would lunge. So the more times it happened I started to believe it was the engine cutting out. Always the same duration (very quick) and only seem to happen under light load. If I would depress the pedal like to pass I didn't experience it.
So have no idea what would cause this but when I got home I drained both fuel filters and did get a small amount of water out of one. Like maybe 2ozs. I added some fuel additive w/ injector lube. And drive it to the storage place without incident. But I'm not confident I've resolved the issue. The storage place is only 3 miles away and not hwy. So I may not have provided the conditions to insure the problem is fixed.
Any input you guys can provide would be appreciated to head me in the right direction. Thanks.

Oh in case my info doesn't show up using my mobile device. Its a 2000 Monaco Windsor with a Cummings 330 diesel. Allison Trans. 87k miles on it. Serviced back in May.
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Old 09-03-2013, 03:03 PM   #2
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Were you driving using the throttle or cruise control ?
If the condition only occurs when using the throttle , I would suspect Throttle position Sensor.
330 HP, is yours the ISC ? several members with lift pump issues lately , on the ISC's, one with a fuel leak , that situation would allow air into the fuel and could cause a stumble.
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Old 09-03-2013, 03:10 PM   #3
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I did have the cruise control on but shut it off when the issue was recognized. But it continued regardless of using the pedal or CC.
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Old 09-03-2013, 03:16 PM   #4
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Quote:
Originally Posted by greatlakes View Post
I did have the cruise control on but shut it off when the issue was recognized. But it continued regardless of using the pedal or CC.
OK, TPS , is out as cause, if you got some water out of the filters , that could have been the trouble, until you can get a longer road test under your belt . You can collect ideas , but I wouldn't be throwing any parts at it.
If you got fuel with-in 100miles of the condition starting , I'd be ready to change filters; when you take it out on the road.
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Old 09-04-2013, 06:57 AM   #5
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Skip when you say lift pump. I assume that's the fuel pump?
Yea I'm not going to start replacing any parts just yet. It seem to be better toward the end of our trip home but was still happening just not as frequently.
The only other egging I can come up with is maybe electric cutting out. I have had an issue earlier this year where the connection to the starter was so corroded it wouldn't start. Acted like dead battery. But after checking that and it was good started thinking starter went bad. But a thorough cleaning of the connection and it fired right up. So I thought that might be a culprit. Then again glow plugs aren't like spark plugs so not sure it would cut out so quickly and come right back on a diesel. ???
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Old 09-04-2013, 07:27 AM   #6
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Engine cutting out

Rob

I had similar problems with my 2002 Monaco Diplomat. It may not be what affects yours but my problem was some gummed up filters caused by bad fuel. I'd try changing the filters and adding a fuel additive before I'd start tearing things apart.
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Old 09-05-2013, 01:19 AM   #7
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Yes , lift pump , is a Cummins term for the electric fuel pump.
You do need to know if you have an ISB, 5.9 or an ISC , 8.1, because the two engines use the pump differently. The ISB the pump runs continually to supply the VF-44 injector pump , while the ISC cycles the pump at start up to prime the CAPS injector pump. In 2000 , I think both engines were available with a 330hp. rating.
Lift pump failure on an ISB , can starve the injector pump for fuel and burn it out. On the ISC, usually only a no start or very slow start condition.
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Old 09-05-2013, 06:14 AM   #8
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I think I had a similar problem when my fuel filter was clogged up. Replaced the filter and everything was better again (This was on a CAT7.2 but I imagine the symptoms might be similar (I believe mine only has 1 filter (many engines have 2)).
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Old 09-05-2013, 12:03 PM   #9
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Mine is the ISC.
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Old 09-05-2013, 12:39 PM   #10
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Quote:
Originally Posted by greatlakes View Post
Mine is the ISC.
For more info , on your coach fuel system , and potential problems.
You may want to read.
In the " Cummins Engine Forums "
" Fuel Manifold Leaking " by " CountryFit "
In the " Alpine Coach Forums " " Fuel Transfer Pump Voltage Issue " by " tillbuilt"
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Old 10-14-2013, 11:19 AM   #11
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I think I figured out what the problem was. After opening the drain of the fuel filter to remove and water it may not have gotten completely closed. So it was sucking air. Seems to be okay now.
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