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.
System Inspection
Warm engine to normal operating temperature and run at idle. Connect dwell meter to White check connector pin No. 1. See Fig 1 . Note dwell meter reading.
If Dwell Meter Reading Is 0 Degrees
- Check pulse signal at engine control unit.
- Check vacuum sensor operation.
- Check coolant temperature sensor operation.
If Dwell Meter Reading Is 27 Degrees
- Check intake air temperature sensor operation.
- Check vacuum hose routing.
- Check O2 sensor operation.
If Dwell Meter Reading Is 36 Degrees
- Check coolant temperature sensor operation.
If Dwell Meter Reading Fluctuates Above Or Below 20-70 Degrees.
- Check vacuum hose routing.
- Check O2 sensor operation.
- Check air/fuel solenoid valve and wiring harness.
- Check carburetor jets and air bleeds.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.
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