GM Anti Theft System Usage

When diagnosing a no start condition these days, it's always a good idea to consider if the vehicle has a theft deterrent system that could be the cause. There's nothing more frustrating than chasing, say, a no crank, or a start and stall, only to find that the system is "only doing its job"! On many older vehicles, you can only check with the owner to see what, if any, after-market " alarm" may have been added. Car companies have increasingly made their own systems available either as options or standard equipment.

2000-2003 Ford Taurus Idle Air Control (IAC) Valve Diagnostics Service Tips

Some vehicles, may exhibit drivability conditions. These may include: • No start • Difficult to start • Stall • Low idle • Rough idle • High idle • Hesitation/surge while accelerating or at steady speed
These conditions may be intermittent with no Diagnostic Trouble Codes (DTC) and no Malfunction Indicator Lamp (MIL). In some cases DTC and MIL may be evident.