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 [email protected] 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
