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.
Diagnostic Aids
When PCM is in back-up fuel, long crank times, fast idle and poor performance conditions will exist. Check for poor connections at CKP sensor and PCM. When diagnosing intermittents, reproduce conditions under which failure occurs. Operate engine at a higher temperature and near RPM when problem occurs. Since heat and vibration often cause intermittents, operating engine at a higher temperature and near RPM when problem occurs could cause intermittent condition.
Check for intermittent problems (i.e., poor connections, rubbed-through wire insulation or broken wire inside it's insulation). See appropriate TROUBLE SHOOTING - NO CODES article.
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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.