* Crank sensor: This sensor tells the computer the engine's rotational speed. A failing crank sensor can cause rough idling and prevent starting. The turn may have jostled a failing sensor to its breaking point.
* Cam sensor: Similar to the crank sensor, but monitors the camshaft's position. A faulty cam sensor can lead to misfires, rough running, and no-start conditions.
* Fuel pump: The turn could have stressed a weakened fuel pump, preventing fuel delivery. This is particularly likely if the fuel pressure is low or inconsistent.
* Ignition system: Worn distributor cap, rotor, spark plug wires, or failing ignition coil can cause misfires and prevent starting. The rough idle might have been a precursor to a complete ignition system failure.
* Fuel filter: A clogged fuel filter would restrict fuel flow, especially under load (like making a turn). This is less likely to be the sole cause, given the long history of rough idling.
* Wiring harness: Damage to wiring, particularly due to age and wear in a 1994 vehicle, could be causing intermittent problems that worsened to a complete failure.
* More than one dirty injector: While the mechanic suspected one dirty injector, it's possible multiple injectors are clogged, resulting in insufficient fuel delivery.
What to do next:
1. Check for obvious problems: Look for any obvious signs of damage to the wiring harness, loose connections, or anything unusual.
2. Have a mechanic diagnose the problem properly: Given the history and the sudden no-start condition, you need a proper diagnostic test. This should include checking:
* Fuel pressure: Is there adequate fuel pressure at the rail?
* Spark: Is there spark at the plugs?
* Diagnostic trouble codes (DTCs): The vehicle's computer may have stored codes indicating the problem.
* Crank and cam sensor signals: Are they within specifications?
* Injector operation: Test injector spray patterns to check for clogging.
3. Don't just replace parts: Avoid throwing parts at the problem. A proper diagnosis is crucial to avoid unnecessary expense.
In short, the initial diagnosis of a single dirty injector was likely incorrect, or at least incomplete. The stalling suggests a more serious underlying issue has finally manifested. A thorough diagnostic test is essential to identify and fix the root cause.
