* Which belt is involved? (Serpentine belt, alternator belt, power steering belt - Fieros used different belt configurations depending on options). A picture would be extremely helpful.
* Which idler pulley are you adjusting? (Describe its location relative to other components like the alternator, power steering pump, etc.)
* What is the problem you are trying to solve? (Belt squealing, belt slipping, unusual noises). Knowing the symptom will help determine the correct adjustment procedure.
General Idler Pulley Adjustment (Serpentine Belt):
Most idler pulleys on a serpentine belt system are adjusted by a bolt that changes the pulley's position. This bolt is usually accessible from the top or side of the engine. However, this is not always the case. Some idlers are fixed and not adjustable.
The process generally involves:
1. Locating the adjusting bolt: This often involves a wrench or socket.
2. Loosening the bolt: Carefully loosen the bolt, usually counter-clockwise.
3. Adjusting the pulley position: Move the pulley to increase or decrease belt tension. The goal is to achieve proper tension where the belt doesn't deflect excessively when pressed in the middle of the longest run between pulleys. A finger's width of deflection is usually sufficient for a serpentine belt.
4. Tightening the bolt: Once the correct tension is achieved, firmly tighten the bolt to secure the idler pulley in its new position.
5. Check belt tension again: After tightening, check the belt tension once more to ensure it remains correct.
Important Safety Precautions:
* Disconnect the negative battery terminal before working on any belt system to prevent electrical shorts.
* Wear safety glasses to protect your eyes from debris.
* Use the correct tools. Improper tools can damage components.
* Consult a repair manual: A factory service manual specific to your 1985 Pontiac Fiero will provide diagrams and precise instructions. These manuals are invaluable for this type of work.
Without more specific information about which idler pulley and the problem you are facing, this is the most general guidance I can offer. Please provide more details, and I'll do my best to assist further.
