What RPM should a 7.3 Idi idle at?
What RPM should a 7.3 Idi idle at? 650 RPM Every diesel has some form of engine speed govornor, the 7.3L IDI is no different. Generally, the injection pump/govornor on a 7.3L will not cause this concern, but low idle speed WILL. We kept all our diesels adjusted to provide a MINIMUM of 650 RPM idle speed HOT in "D". How many miles does a 1991 IDI diesel have? The engine/truck is as reliable as the preventative maintanance/care it gets. My '91 has 243,000 miles on it with a LOT of towing and has needed no internal work so far....