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Tiny
BTOURES
  • MEMBER
  • 1998 MERCEDES BENZ CLK320
  • 26,000 MILES
I got an check engine code of: PO170 (BANK 1) AND PO173 (BANK2) I REPLACED THE maf BUT NO LUCK
Thursday, November 24th, 2011 AT 8:24 PM

1 Reply

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

1. Excessive fuel pressure can be cause by restricted fuel return line

2. Defective Oxygen Sensors.

3. Leaking injectors and fuel pressure regulator.

4. Coolant temperature sensor out of calibration.

5. Restricted air intake system.
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Thursday, November 24th, 2011 AT 10:50 PM

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