Erratic Detroit 60 Series Idle

[Gil_J]

If you experience a high idle, well above 1,000 RPM you might suspect the throttle position sensor. Mine would occasionally do this and thankfully stored the alarm. This is a simple 5 minute fix. Buy your replacement sensor from Prevost. There price is about $100 less than Detroit's.

[dale farley]

Gil, Many owners don't think about checking with Prevost, the Converter and/or Detroit when purchasing parts. I replaced all the shocks on my 93 Marathon a few years ago, and the convertor wanted almost $200 each. I got the original shocks from Prevost for $35 each. It does pay to shop around!

I never recall the high idle going above 1000 RPMs when I had the bus, and there were no codes the last time I checked, but I suppose that is one of those things that can go bad from "non-use" maybe even faster than "normal-use".

[Kenneth Brewer]

Gil, Many owners don't think about checking with Prevost, the Converter and/or Detroit when purchasing parts. I replaced all the shocks on my 93 Marathon a few years ago, and the convertor wanted almost $200 each. I got the original shocks from Prevost for $35 each. It does pay to shop around!

I never recall the high idle going above 1000 RPMs when I had the bus, and there were no codes the last time I checked, but I suppose that is one of those things that can go bad from "non-use" maybe even faster than "normal-use".

Gil probably has the right response for this case. Diesels' idle shouldn't change without a distinct malfunction. As an example, we just fired up our Bluebird a week ago after 5 years 2 months. Once the manual prime pump was used to restore injector pump supply pressure, it fired up and ran as though it had run the day before, whether at idle or higher throttle. Dying idle and then stopping will occur, however, if the filters clog. My two cents.