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03-28-2023, 08:05 PM
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#1
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Junior Member
Join Date: Aug 2022
Posts: 3
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Over boost?
We are driving our 2004 discovery, while on the highway, when the rig wants to downshift to go up a hill, we are getting a dash warning saying stop engine and check engine. Stops as soon as you release the throttle. Anyone else have this issue, thinking we are possibly over boosting?
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03-29-2023, 04:54 AM
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#2
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Senior Member
Holiday Rambler Owners Club
Join Date: Apr 2020
Location: Farmington Hills, Michigan
Posts: 809
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What engine & chassis do you have?
What Fault Codes do you have? If you don't have a code reader, I suggest you get one.
__________________
2004 Holiday Rambler Imperial 40PKD, Cummins ISL 400
2019 Buick Envision AWD
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03-29-2023, 06:26 AM
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#3
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Senior Member
Join Date: Jul 2014
Posts: 33,284
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Most likely need fuel filter service.
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03-29-2023, 07:43 AM
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#4
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Senior Member
Join Date: Sep 2021
Location: California
Posts: 236
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Maybe temperature related. Check your coolant temperature. Also can be oil related, you may have low oil level.
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03-29-2023, 10:36 AM
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#5
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 26,324
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Over-boost would be well down my list of suspects and it may not even be possible in that particular configuration (max turbo boost may be the norm). Both Stop and Check conditions will have stored a code, so get them read out and go from there.
A safe starting point would be fresh fuel & air filters and an oil & filter change. Inability to maintain a proper air/fuel ratio can trigger a lot of diesel fault codes.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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03-29-2023, 05:31 PM
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#6
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"Formerly Diplomat Don"
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 22,395
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If you haven't done it in a while, the cheapest/simplest thing to do first, is change both fuel filters. Often, when CEL's are triggered by acceleration, it's a fuel issue.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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03-29-2023, 08:43 PM
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#7
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Senior Member
Join Date: Oct 2008
Location: Marshfield, WI
Posts: 714
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Another thing to look at would be the waste gate, if you have one. Sometimes they become corroded and need to be lubricated.
There's also an electrical component that could be checked.
__________________
Denny, Connie & Shadow (former barn cat made good)
2006 Tiffin Phaeton, Cat C7, Freightliner Chassis
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03-30-2023, 04:42 PM
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#8
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 26,324
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Based on the 2004 brochure I'm saying a 2004 Discovery has an Cat 7.2L (C7) with an exhaust brake, but it sure would be nice to know for sure.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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