Pontiac Automotive Repair Questions

Pontiac Cars and SUV's.

Here is a list of auto repair questions and answers.

Click on your model to read the articles.

Articles being added all the time.

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How Things Work

Baisic Starting System Function and Operation

The cranking circuit consists of the battery, starter motor, ignition switch, and related wiring.

These starter motors are not serviceable and are replaced as assemblies only.

Most of today's starter motors are non-repairable starter motors. They have pole pieces that are arranged around the armature within the starter housing. When the solenoid windings are energized, the pull-in winding circuit is completed to ground through the starter motor.

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Common Engine Codes

Idle Air Control Valve Engine Light Codes

P0506 - P0507
The idle air control (IAC) valve is located in the throttle body of the SFI systems. The IAC consists of a movable pintle, driven by a gear attached to an electric motor called a stepper motor. The IAC valve motor is a two phase bi-polar permanent magnet stepper motor that is capable of highly accurate rotation, or movement, every time the polarity of a winding is changed.

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