Intermittent power loss ISC 315 hp
Cummins ISC 315hp in a 2002 Holiday Rambler Ambassador RV. When power loss suddenly occurs, boost is only 6-9 no matter how much accelerator pedal is pushed. First occurred in Klamath Falls OR - went to Pape Cat/ Kenworth and it checked OK and diagnostic laptop showed no problems. OK for a couple hundred miles and next day happened again going up a long hill on I-5. Speed dropped to about 25 mph, even when downshifted, boost low again. Started working again, then intermittently occurred and resumed OK until a long hill (Emigrant Pass on I-80 Eastbound in Nevada) when I called for service when it would not resume OK. Towed to Cummins in Elko, NV. Was there over a weekend and after 4 days they had replaced the Fuel Injection controller ($1500. part, may not be exact name) and we all thought it was good to go. Started malfunctioning intermittently again between Laramie WY and Denver but livable because not on big hills and we had to keep going if possible because of freezing weather close behind us.. When it malfunctions on level terrain it only drops speed to about 50 mph and can even accelerate to up to 65 going down slight hills. We need to get back home to Florida so I am inclined to keep going and not be stuck anywhere for days again. We are in Memphis for Thanksgiving and no major hills between here and home, about 800 more miles. Any ideas? Is there a valve of some kind (maybe EGR?) that could intermittently stick causing this problem? Thinking about locating EGR and seeing if I can get to it to give it a good whack to see if that makes it go away! Will probably find a Cummins service shop when I get home in Florida next week. Appreciate any ideas; don't want to pull into an RV place which might just start replacing multiple items until it is fixed! All filters changed (oil, air, fuel) and oil was changed during service just before start of trip.