Cummins ISC 350 Hesitates @ High RMP
Hello All,
I have the ISC 350 in my '01 Windsor. On my last trip from Redding to Central Oregon, after 50 or so miles I began ascending grades, and shortly after my engine began hesitating and stuttering losing power at and over about 1,700/1,800 RMP - higher RMP were more stuttering/hesitation. If I slowed and downshifted to keep the RPM under this range the engine performed fine.
The transmission was shifting well, the fluids were correctly filled, the turbo boost seems fine, all temps and oil pressure were as they should be, and so long as I'm under the 1,700/1,800 mark there is no issue in any of my six transmission gears; over 1,700/1,800, however, and in any gear the engine stutters hesitates...RMS drop then in a split second recovering, dropping and rebounding, etc. as the engine loses power and the coach speed. The problem seemed to become more intense as my trip went on. I was running with a 3/4 full diesel tank.
My last trip was from Phoenix to Redding over the Tehachapi pass with no 2,500# toad, no issues whatsoever and no indication of this problem. Since the last trip, all I have done is add fuel and check fluids. I weighed in before this trip at 32,400# with my toad, well under the 42K# GVWR and load distribution between axles was fine.
I'm in rural Central Oregon now (45-miles South of Bend) until July 9, and at least that far from a qualified mechanic. I'm trying to determine if a) it's a minor problem I can diagnose/address, b) if I can muddle my way to a mechanic under my own power or c) do I need to be towed/obtain mobile service.
I would appreciate hearing from anyone with thoughts, ideas, similar experiences or suggestions.
Thanks a lot,
Chris
PS 125K engine/coach miles
Chris Roesner
2001 Monaco Windsor 38'
2004 Toyota Scion Xa
I have the ISC 350 in my '01 Windsor. On my last trip from Redding to Central Oregon, after 50 or so miles I began ascending grades, and shortly after my engine began hesitating and stuttering losing power at and over about 1,700/1,800 RMP - higher RMP were more stuttering/hesitation. If I slowed and downshifted to keep the RPM under this range the engine performed fine.
The transmission was shifting well, the fluids were correctly filled, the turbo boost seems fine, all temps and oil pressure were as they should be, and so long as I'm under the 1,700/1,800 mark there is no issue in any of my six transmission gears; over 1,700/1,800, however, and in any gear the engine stutters hesitates...RMS drop then in a split second recovering, dropping and rebounding, etc. as the engine loses power and the coach speed. The problem seemed to become more intense as my trip went on. I was running with a 3/4 full diesel tank.
My last trip was from Phoenix to Redding over the Tehachapi pass with no 2,500# toad, no issues whatsoever and no indication of this problem. Since the last trip, all I have done is add fuel and check fluids. I weighed in before this trip at 32,400# with my toad, well under the 42K# GVWR and load distribution between axles was fine.
I'm in rural Central Oregon now (45-miles South of Bend) until July 9, and at least that far from a qualified mechanic. I'm trying to determine if a) it's a minor problem I can diagnose/address, b) if I can muddle my way to a mechanic under my own power or c) do I need to be towed/obtain mobile service.
I would appreciate hearing from anyone with thoughts, ideas, similar experiences or suggestions.
Thanks a lot,
Chris
PS 125K engine/coach miles
Chris Roesner
2001 Monaco Windsor 38'
2004 Toyota Scion Xa
