GM 6.5L V8 – Idle Speed Adjustment

The 6.5L V8 turbo diesel engine has an idle speed control screw on the left side of the injection pump (see Figure 1-10). Also, a fast idle solenoid in the same location controls engine speed during warm-up.

As part of maintenance, the idle speed should be adjusted at 5,000 miles, then at 30,000 miles, 60,000 miles, etc. A magnetic-type engine tachometer or a Tech 1 diagnostic tool should be used to indicate engine speed when performing this procedure (see page 7-17 for more information). Refer to page 7-87 of this book for the idle speed adjustment procedure.

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