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.
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HOMESERVICE MANUALSSUBARU1990XT-6 4WD L6-2.7L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMTESTING AND INSPECTION
1990 Subaru XT-6 4WD L6-2.7L SOHC
Ignition System: Testing and Inspection
1990 Subaru XT-6 4WD L6-2.7L SOHCSECTION Testing and Inspection
NO SPARK TEST AND INSPECTION
1. Disconnect #1 ignition wire at the spark plug.
2. Install a spark tester into the end of the spark plug boot.
3. Have an assistant crank the engine over and check for spark at the tester.
4. Repeat this process at each spark plug.
^ If any cylinder does not show spark, test and inspect secondary components.
^ If all secondary components test O.K., test and inspect primary components.
^ If all cylinders test O.K., inspect for fouled spark plugs and clean or replace as necessary.
5. If no faults are found in the above tests, proceed to Computers and Control Systems for further diagnosis.
Spark Tester:
1. Disconnect #1 ignition wire at the spark plug.
2. Install a spark tester into the end of the spark plug boot.
3. Have an assistant crank the engine over and check for spark at the tester.
4. Repeat this process at each spark plug.
^ If any cylinder does not show spark, test and inspect secondary components.
^ If all secondary components test O.K., test and inspect primary components.
^ If all cylinders test O.K., inspect for fouled spark plugs and clean or replace as necessary.
5. If no faults are found in the above tests, proceed to Computers and Control Systems for further diagnosis.
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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.