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2002 BMW 325 2002 325i rough idle and hesitates from start

Tiny
VFABRR
  • MEMBER
  • 2002 BMW 325
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 13,500 MILES
My 2002 325i seems to idle rough and hesitates especially when it is hot outside. It ran well for approximately 4 months but now the issue is back again. I get a P1345 code and a P0155 and P0135. A new code that I haven't seen also popped up, P0444. At first my wife thought it was the gas we were using and we since switched. Now it is occuring again. I thought the first thing to check/replace would be the fuel filter/pressure regulator. I'm not sure if the fuel pump would cause intermittent problems or not? Also what about MAF or O2 sensors?
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Saturday, June 19th, 2010 AT 1:54 AM

2 Replies

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Guessing at the issue will cause many frustrations, I suggest scanning the car with BMW specific proprietary software and looking at the history of the car. Was it ever at the dealer for coil replacement? Misfiring can be caused by several issues, lets find the issue, not just throw parts at it, OK?
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Saturday, June 19th, 2010 AT 10:32 AM
Tiny
VFABRR
  • MEMBER
  • 2 POSTS
No, the coil has never been replaced as far as I know. There was a fuel sending unit issue a couple of years ago and it took several returns to BMW service to fix the issue. It was under warranty at the time
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Saturday, June 19th, 2010 AT 8:27 PM

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