To find the correct firing order for *your* specific Renault 5 GT Turbo:
1. Locate your distributor cap: It's usually on the top of the distributor.
2. Check the markings on the distributor cap: The cap itself *should* have the firing order printed on it (often using numbers 1-4 corresponding to cylinders). This is the most reliable method.
3. Consult your owner's manual: Your owner's manual will definitively state the firing order for your specific vehicle's engine.
4. Check a Renault 5 GT Turbo-specific workshop manual: These manuals often have detailed diagrams and information about the ignition system. You can find these online or at automotive parts suppliers.
Without access to your specific vehicle's documentation or distributor cap, I cannot provide the correct firing order. Getting it wrong can cause misfires and serious engine damage. Always rely on your vehicle's documentation for the correct firing order.