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1995 BMW 325 Hard to start!

Tiny
MAGEWULF
  • MEMBER
  • 1995 BMW 325
  • 6 CYL
  • 2WD
  • MANUAL
  • 182,000 MILES
My car has developed a starting problem. In the mornings it will start after about 10 seconds of cranking. As soon as I shut it off, I cannot get it to start unless I wait 6-8 hours. Once started the car runs fine. There is not a Check engine light on either. I purchased a scantool, and it gave me the codes for knock sensor 1-3, knock sensor 4-6, DWA/DWS input, and speed signal. Is it possible that both knock sensors are bad? Or do I have other issues?
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Thursday, June 10th, 2010 AT 10:06 PM

3 Replies

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
This is most likely a combination of items conspiring together to bring this grief. The intake manifold may have vacuum leaks, the knock sensors are probably not a factor. To find the root issue, the basics need to be inspected, the fuel pressure and delivery, the overall state of tune, the possibility of an intake leak. There may also be other factors that could be contributing to this hard start, but lets start with what we have here.
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Friday, June 11th, 2010 AT 8:21 AM
Tiny
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What is the easiest/cheapest way to check these?
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Friday, June 11th, 2010 AT 10:34 AM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Fuel pressure/delivery can be done with a gauge/graduated container to find if it is holding pressure. I usually use a smoke producing machine to pinpoint leaks in the intake system.
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Friday, June 11th, 2010 AT 11:14 PM

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