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2003 BMW 325 I

Tiny
XTOFER99
  • MEMBER
  • 2003 BMW 325
Engine idles rough momentarily on 1st start of day. Sometimes can even stall. Acts like it is out of fuel. After it finds idle, runs great. No codes from PCM. Does fuel pump have backflow valve to keep system primed? Could this be problem? Thanx
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Monday, September 3rd, 2007 AT 2:06 PM

1 Reply

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Yes there is a check valve at the pump and you may have identified the cold start issue. Try putting a fuel pressure gauge on it and let it sit overnight. The non-return system has a fitting at the fuel filter you can tap on to. The filter is under the car on the left side by the frame rail.
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Monday, September 3rd, 2007 AT 5:31 PM

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