It will you're ruining the cylinders, you gonna end up with engine compression problems
Probable causes of an engine running rich are as follows:
1. Excessive fuel pressure can be cause by restricted fuel return line or defective fuel pressure regulator.
2. Defective Oxygen Sensors.
3. Leaking injectors and fuel pressure regulator.
4. Coolant temperature sensor out of calibration.
5. Restricted air intake system.
Saturday, October 9th, 2010 AT 5:03 PM