Experiencing a no-start issue with a 1992 Toyota MR2 can be frustrating, especially when you’re eager to enjoy this classic sports car. You’re not alone if your MR2 cranks but fails to start. Let’s explore some common causes and troubleshooting steps to get your MR2 back on the road.
One owner is facing this exact problem with their track-converted 1992 MR2. Initially, the car would start and run, but after sitting, it reverted to a no-start condition. They’ve already taken some initial steps, which is a great starting point.
The first checks involved the EFI relay, a common culprit in fuel and ignition issues. Replacing this is a good initial step. Fuel delivery was also investigated by manually powering the fuel pump. Observing fuel movement in the lines suggests the pump is functioning, and fresh fuel and a new fuel filter have been installed, eliminating fuel quality as an immediate concern.
However, the key symptom identified is intermittent spark. Testing a spark plug revealed spark for a few seconds after ignition, then complete spark loss while cranking. This points towards an ignition system problem. Suspect components are the ignition coil and igniter. These are indeed potential failure points on the 1992 Toyota MR2 and are logical next steps for component replacement.
Before replacing parts, it’s wise to double-check some basics. Wiring integrity is crucial, and the owner has thankfully reported no rodent damage and all fuses are intact. However, visually inspect all wiring connectors related to the ignition system for corrosion or loose connections.
To further diagnose the no-spark condition, consider these steps:
- Crankshaft Position Sensor (CKP): This sensor is vital for signaling engine position and speed to the ECU, which in turn controls spark and fuel injection. A failing CKP sensor is a frequent cause of no-spark issues. Testing the CKP sensor with a multimeter or oscilloscope can confirm its functionality.
- Distributor and Rotor (If Applicable): While some 1992 MR2 models might have distributorless ignition, others may use a distributor. If your model has a distributor, inspect the distributor cap and rotor for cracks, carbon tracking, or moisture.
- Ignition Switch: Though less common, a faulty ignition switch can interrupt power to the ignition system.
- ECU/ECM: The Engine Control Unit (ECU) or Engine Control Module (ECM) is the brain of the engine management system. While ECU failure is less frequent, it’s a possibility if other components check out. Diagnostic scanning tools can help read error codes and potentially pinpoint ECU-related issues.
By systematically checking these components and utilizing diagnostic tools, you can effectively troubleshoot the no-start, no-spark issue on your 1992 Toyota MR2 and get back to enjoying your ride.
Alt text: 1992 Toyota MR2 parked, showcasing its iconic silhouette and sporty design.
Alt text: Close-up of 1992 Toyota MR2 engine bay, highlighting the hood, tire, and motor vehicle components.
Alt text: Detailed view of 1992 Toyota MR2 wheel and tire under the hood, emphasizing vehicle mechanics.
Alt text: Engine compartment of a 1992 Toyota MR2 showcasing automotive design and tire placement within the motor vehicle.
