Auto Tune Up Service
Any tune-up today should start with a battery of performance checks to base line or confirm the engine’s overall condition.
These should include:
• Battery voltage (very important with all of today’s onboard electronics).
• Charging voltage. Power balance or dynamic compression (to identify any mechanical problems such as leaky exhaust valves, worn rings, bad head gasket, bad cam, etc. that could adversely affect compression and engine performance)
• Engine vacuum (to detect air leaks as well as exhaust restrictions) Operation of the fuel feedback control loop (to confirm that the system goes into closed loop operation when the engine warms up)
• Check ignition timing — if possible (should be checked even if it is not adjustable to detect possible computer or sensor problems) Operation of the EGR valve.