* Ignition System: The popping noise is a key indicator. This could point to:
* Distributor Cap and Rotor: Cracks or worn contacts in the distributor cap and rotor can cause misfires and eventual complete engine failure. Moisture can exacerbate this.
* Ignition Coil: A failing coil might intermittently provide insufficient voltage to the spark plugs, leading to the sputtering and eventual complete shutdown.
* Ignition Module (ECM): The electronic control module (ECM) controls the ignition timing and spark delivery. A faulty module can cause erratic behavior and complete failure. This is particularly likely given the complete shutdown after the initial restarting.
* Spark Plugs and Wires: Worn spark plugs or damaged wires can cause misfires, leading to the symptoms you're experiencing. High engine loads (like freeway driving) often expose weak ignition components.
* Fuel System: While less likely given the popping noise (which points more towards ignition), fuel issues could contribute:
* Fuel Pump: A failing fuel pump might not be able to provide sufficient fuel pressure, especially under load. It could be failing intermittently, leading to the initial restart failure.
* Fuel Filter: A clogged fuel filter restricts fuel flow, causing similar issues to a failing fuel pump.
* Fuel Injector(s): A clogged or malfunctioning fuel injector could lead to misfires and engine stall, though less likely to cause the described popping sound initially.
* Other Possibilities (less likely but worth considering):
* Timing Belt/Chain: While less probable given the initial popping and restarting, a broken timing belt or chain would cause a catastrophic engine failure, resulting in no cranking and likely internal damage. The clicking might be the starter motor struggling.
* Alternator: If the alternator is failing, the battery may not have enough charge to keep the engine running, but usually this leads to progressively dimming lights and eventually stalling.
What to do:
1. Safety First: Do NOT attempt to drive the car further. Towing is necessary. Continuing to crank the engine with a clicking sound could cause further damage to the starter.
2. Diagnostics: You'll need to have a mechanic or experienced Fiero owner diagnose the issue. They'll likely:
* Check the basics: Inspect the distributor cap, rotor, spark plugs, and wires for visible damage or wear.
* Test the ignition system: Use a multimeter to test the ignition coil, ignition module, and battery voltage.
* Check fuel pressure: Measure fuel pressure to ensure the pump and filter are functioning correctly.
* Listen for the clicking: Pinpoint the exact location of the clicking sound. If it's the starter motor, the problem might be more significant than just a coil or distributor cap.
3. Repair: Based on the diagnosis, the necessary repairs can be performed. This could range from simple part replacements (plugs, wires, cap, rotor) to more involved repairs (ignition module, fuel pump).
Given the severity of the problem and the potential for further damage, professional help is strongly advised. Trying to troubleshoot this yourself without the proper tools and knowledge could lead to more costly repairs.
