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Old 04-08-2021, 06:56 AM   #1
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3126e runs rough 1400 to 1700rpm

3126e has low power and runs rough when throttle is advanced under way in the 1400 to 1770 range. It happens in all gears so the transmission is not suspect. Downshifting to above 1700rpm performance seems normal.
The turbo CAC plumbing is intact with no apparent leakage.
Ideas?
Bob
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Old 04-08-2021, 09:38 AM   #2
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With throttle application in that RPM range (1400>1700) the trans torque converter could be in lock up mode in any gear selected , and on light throttle applied set up a driveline " shudder " that could be described as rough engine run.

Have you checked for trans codes or had the engine ECM scanned?
Any history of trans service ?
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Old 04-09-2021, 12:05 PM   #3
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Thanks Skip, the only trans service was 3 years ago at 90000 miles for fluid and filters. Transynd was used.
This "shudder" has developed over the last 10000 miles. I will check for codes next time I run it.
ECM was new 20000 miles ago. Currently at 130000 miles and not burning crankcase oil.
U joints new 20000 miles ago and well greased since.
Bob
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Old 04-09-2021, 12:16 PM   #4
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Possible engine mount issues need to be examined .

I'm currently looking for replacements due to a vibration through the coach at idle .
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