Tip In Hesitation During Low Speed Acceleration - Inspect Secondary AIR Injection Solenoid Valve

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

On rare occasions, a tip in hesitation may be experienced on acceleration from a stop. This may happen at any engine temperature, but it is typically more apparent on light tip in acceleration after idling at operating temperature for 1 - 2 minutes.

This concern may be due to a leaking Secondary Air Injection Solenoid Valve, which is mounted to the passenger side of the cylinder head.

If the SI diagnostics do not isolate a cause for this concern, temporarily remove the hose from the Secondary Air Injection Solenoid Valve, start the engine, and inspect the inlet side of the valve for exhaust pulsations with it closed at an idle. If exhaust pulsations are present, replace the Secondary Air Injection Solenoid Valve and evaluate the concern.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.