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Home >> Mazda >> 1994 >> B2300 L4-2.3L VIN A >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Charts By Number >> 30 Intermittent Concerns
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30 Intermittent Concerns

DESCRIPTION
Symptom occurs randomly and is difficult to diagnose.

1. Talk to customer. Review the vehicle service history. Does the vehicle have a number of previous repairs and components replaced for a certain symptom?

Yes - Go to Test 2.
No - Go to diagnostic index. Symptom Index

2. Is an engine analyzer available?

Yes - Follow the instructions supplied with the engine analyzer to diagnose the concern.
No - Go to Test 3.

3. Will the engine start?

Yes - Go to Test 4.
No - Go to "CRANKS NORMALLY BUT WILL NOT START" diagnostic index. 5 Cranks Normally But Will Not Start

4. Start the engine and run it at idle. Raise the hood, shake wiring harness and pull wires at connectors for ignition components.
Does the engine quit?

Yes - Service wiring harness or connector.
No - Go to Test 5.

5. Run the engine at idle. Close the hood. Turn the A/C on, blower on at medium speed, and allow engine to run for 15 minutes. Does the engine quit?

Yes - Go to Test 9.
No - Go to Test 6.

6. Stop the engine. Let the vehicle hot soak for 10 minutes with the hood closed.
Will the engine restart?

Yes - Go to Test 7.
No - Go to the "CRANKS NORMALLY BUT WILL NOT START" diagnostic index. 5 Cranks Normally But Will Not Start

7. Start the engine and run it at idle. Raise the hood, shake wiring harness and pull wires at connectors for ignition components.
Does the engine quit?

Yes - Service wiring harness or connector.
No - Go to Test 8.

8. Road test the vehicle.
Does the engine quit?

Yes - Go to Test 9.
No - Symptom not duplicated. Return to diagnostic index to service any additional concerns. Symptom Index

9. Raise the hood. Shake wiring harness, pull wires at connectors, separate and reconnect connectors for ignition components. Does the engine start?

Yes - Service wiring harness or connector.
No - Go to the "CRANKS NORMALLY BUT WILL NOT START" diagnostic index. 5 Cranks Normally But Will Not Start

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