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.
1986 Merkur XR4Ti AutomaticFACTORY OEM SERVICE PROCEDURE
Timing Check
NOTE:
If engine will not start, go to CIRCUIT TEST A
. If engine starts but stalls while testing, go to DIAGNOSIS BY SYMPTOM
TEST.
- Turn ignition switch to "OFF" position, and then wait 10 seconds. Verify that SELF-TEST has been activated. Restart engine and check timing while in SELF-TEST mode. You are allowed 2 minutes to check timing from the time the last code is displayed.
- Correct SELF-TEST timing equals base ignition timing (10° BTDC on all engines) plus 17-23° BTDC. If timing is not 27-33° BTDC, go to CIRCUIT TEST MM. If timing is 27-33° BTDC, go to ENGINE RUNNING SELF-TEST .
Factory Service Tools
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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.