Diagnostic Aids
WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.
The system will go lean if an injector is not supplying enough fuel. A lean condition could be present during high fuel demand due to a fuel pump that does not pump enough fuel. Using a scan tool, review the Failure Records. If an intermittent condition is suspected, refer to INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 2.2L SONOMA & S10 PICKUP article.