Diagnose This

June 1, 2009

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By Truck Parts & Service Staff

Each month in Diagnose This! we present a real-life service scenario with clues as to what the ultimate diagnosis was. If you think you know the answer, be the first to e-mail Dsmith@rrpub.com with the correct response for free Truck Parts & Service merchandise. The answer will be revealed in a future issue of the magazine.

Vehicle: 2005 IH 7400 flatbed with 95,000 miles

Key components: DT466 engine with exhaust gas recirculation (EGR), manual transmission

Scenario: Vehicle has very low power and barely reaches 40 miles per hour on level ground.
Clues:

Cycling key OFF/ON sometimes restores power to normal for varying lengths of time.

Trouble codes are of limited help