For 1990-2009 cars

# Hesitation on Acceleration After Internal Engine Repairs - keywords fuel lean induced sag

Subject: | Hesitation on Acceleration After Internal Engine Repairs - Check Injector Harness Orientation

Models: | 2002-2005 Chevrolet Cavalier

| 2005-2006 Chevrolet Cobalt

| 2006 Chevrolet HHR

| 2004-2006 Chevrolet Malibu

| 2004-2005 Chevrolet Malibu Classic

| 2002-2004 Oldsmobile Alero

| 2002-2005 Pontiac Grand Am

| 2005-2006 Pontiac Pursuit (Canada Only)

| 2002-2005 Pontiac Sunfire

| 2003-2006 Saturn Ion

| 2001-2005 Saturn L Series

| 2002-2006 Saturn Vue

| with 2.2L Engine (VIN D or F - RPO L61)

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

### Condition/Concern:

On some of the above models, it is possible to install the fuel injector harness backwards (reversed 180 degrees so #1 injector plugs into #4 injector). If this occurs during engine repairs, the vehicle will run lean and exhibit a tip in hesitation once it is reassembled. Typically, no DTCs or engine misfires will be present if this occurs.

### Recommendation/Instructions:

If a tip in hesitation exists after internal engine repairs and the SI diagnostics do not isolate a cause, ensure that the fuel injector harness is installed correctly by referring to the fuel injector schematic in SI or comparing with a known good vehicle.

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.