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2001 Volkswagen Beetle Rough idle

Tiny
AXELAB_Q
  • MEMBER
  • 2001 VOLKSWAGEN BEETLE
  • 4 CYL
  • 2WD
  • MANUAL
  • 105,000 MILES
Car idles rough upon start. Checked codes and my system is rich. MAF and O2 sensors seem to be fine. I was thinking I may need to change out the fuel filter. Sound like a good idea? Any suggestions? I'd appreciate the help.
Friday, April 16th, 2010 AT 7:37 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Probable causes of an engine running rich are as follows:

1. Fuel pressure not within specs. Can be cause by restricted fuel return line or defective fuel pressure regulator.
2. Defective Oxygen Sensors.
3. Leaking injectors.
4. Coolant temperature sensor out of calibration.
5. Restricted air intake system.
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Friday, April 16th, 2010 AT 4:25 PM

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