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Old 10-24-2017, 06:12 PM   #1
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1999 8.3L Cummins temp turbo boost loss

Several days ago driving in heavy rain lost all turbo boost for 10 miles or so. Boost came back and no further codes

1999 8.3 l ISC with banks system. Warning light on dash on during turbo boost loss with my VMSPC showing a eng PID 102 4 boost pressure low voltage.

Any thoughts from other members out there?

1. moisture from heavy rain?

2. intermittent MAP or manifold pressure sensor?

3. Banks related. EGT temp monitor or banks control box?

regards James
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Old 10-25-2017, 09:20 PM   #2
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Sounds like water entered the air intake enough to wet the air filter. There should be a water dam in the intake to deflect water and send it to a duckbill water drain in the bottom of the intake box that is prior to the filter.
I squeeze mine about once a year to allow dirt/bugs to fall out instead of clogging the duckbill and possibly allowing water to reach the air filter. Which reminds me I haven't done that since last year; coach has been in storage except for 3 weeks since DW's auto accident Feb. last year.
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Old 10-28-2017, 01:58 PM   #3
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I agree with Ray. Probably wet air filter.

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Old 10-28-2017, 02:27 PM   #4
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Just to clarify, you say you lost all boost as indicated by your dash gauge. Did you actually loose power at that time or just boost pressure on the gauge?

Makes no sense that boost will disappear and come back again. If the turbo fails, it's done. There's no return other than replacement.

I'm inclined to think it was an electrical issue with the indicator.
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Old 10-28-2017, 07:48 PM   #5
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A number of diesel owners have had their air filter come apart and get into turbo. The paper in the air filter after 2 years will sometime come apart from water getting in air cleaner. Should replace paper air filter at least ever 2 years. Might pull inlet pipe off turbo to see if paper is in turbo and if air filter is coming apart.
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Old 10-28-2017, 09:01 PM   #6
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Quote:
Originally Posted by tom chelbana View Post
A number of diesel owners have had their air filter come apart and get into turbo. The paper in the air filter after 2 years will sometime come apart from water getting in air cleaner. Should replace paper air filter at least ever 2 years. Might pull inlet pipe off turbo to see if paper is in turbo and if air filter is coming apart.
I agree with you Tom but the OP indicated he lost boost pressure and then it came back.
I doubt very much if it injested the air filter, the turbo would be unlikely to restore itself.
The OP has not returned to clarify so at this point, it's a mystery. IMHO.
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Old 11-02-2017, 09:24 PM   #7
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clarification

During Boost pressure loss power was lost as well. Vmspc showed 165 hp max and i was lucky there were no big hills. I have now driven 1500 miles more with no issues. It is still a mystery but purchased new intake manifold sensor and egt probe and harness so i have a chance to try something if issue reappears. Thanks
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Old 11-06-2017, 10:01 PM   #8
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My '05 Diplomat had a very similar loss of boost heading into St Louis in June 2013. Gauge actually quit moving and would stick at various points on the dial. Called ahead to Cummins as I was about 70 miles west heading into St Louis. Service Mgr said bring it in. They jumped on it and found a loose air line fitting on the turbo itself, tightened it and I was out in about 2 hours including my 3 mile road test. I think the bill was about $137 or so. Very good experience.
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Old 11-07-2017, 06:00 PM   #9
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Quote:
Originally Posted by tom chelbana View Post
A number of diesel owners have had their air filter come apart and get into turbo. The paper in the air filter after 2 years will sometime come apart from water getting in air cleaner. Should replace paper air filter at least ever 2 years. Might pull inlet pipe off turbo to see if paper is in turbo and if air filter is coming apart.
I agree that this could happen. it happened to me when I first bought the MH. Found that the air filter had gotten wet and had come apart to the point that pieces of paper were in the turbo. I could envision that a clump of paper could have blocked the air enough to have no boost and then when the paper dried it passed air.
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