Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1985 Merkur XR4Ti StandardFACTORY OEM SERVICE PROCEDURE
Fuel Injector Functional Test
- If the engine will not accelerate smoothly and idles roughly, a fuel injector may be inoperative. To check for a faulty injector, first bring the engine to operating temperature. With the engine idling disconnect and reconnect each injector while noting any change in idle speed.
- When a good injector is disconnected, idle speed should drop and then recover when the injector is connected. If an injector is disconnected and no change occurs in idle speed or quality, a faulty injector is indicated. See Fig 1 .
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.