Diagnostic Aids

DTC P0130 or slow response is most likely caused by one of the following conditions:

• Fuel Pressure
  
  System will go rich if fuel pressure is too high. PCM can compensate for some increase, however, if it gets too high, a DTC P0172 may set.
• Leaking Injector
  
  Leaking or malfunctioning injector can cause system to go rich.
• Manifold Absolute Pressure (MAP) Sensor
  
  An output that causes PCM to sense a higher than normal manifold pressure (low vacuum) can cause system to go rich. Disconnecting MAP sensor will allow PCM to set a fixed value for MAP sensor. Substitute a different MAP sensor if rich condition is gone while MAP sensor is disconnected.
• Pressure Regulator
  
  Test for a leaking fuel pressure regulator diaphragm by inspecting for presence of liquid fuel in vacuum line to fuel pressure regulator.
• TP Sensor
  
  An intermittent TP sensor output can cause system to go rich due to a false indication of engine accelerating.
• O2S1 Contamination
  
  Inspect O2S1 for silicone contamination from fuel or use of improper RTV sealant. O2S1 sensor may have a White powdery coating and result in a high but false voltage signal, indicating a rich exhaust condition. PCM will then reduce the amount of fuel delivered to the engine, causing a severe surge or driveability problem.