2000StreetRod
Moderator Emeritus
- Joined
- May 26, 2009
- Messages
- 10,597
- Reaction score
- 334
- City, State
- Greenville, SC
- Year, Model & Trim Level
- 00 Sport FI, 03 Ltd V8
EGR valve gasket
Check the EGR valve gasket to make sure it is intact.
Another possibility is the coolant temperature sensor (the one that connects to the PCM) may not be functional. If there is an open connection the PCM may think the engine is cold and increase the richness.
You can disconnect the PCM connector and measure the resistance between pin 38 (LT GRN/RD) and pin 91 (GY/RD).
Check the EGR valve gasket to make sure it is intact.
Another possibility is the coolant temperature sensor (the one that connects to the PCM) may not be functional. If there is an open connection the PCM may think the engine is cold and increase the richness.
You can disconnect the PCM connector and measure the resistance between pin 38 (LT GRN/RD) and pin 91 (GY/RD).