1995 BMW 325 Hard to start!

1995 BMW 325
182,000 MILES • 6 CYL • 2WD • MANUAL
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MAGEWULF
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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?
Jun 10, 2010 at 10:06 PM
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DOCHAGERTY
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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.
Jun 11, 2010 at 8:21 AM
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MAGEWULF
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What is the easiest/cheapest way to check these?
Jun 11, 2010 at 10:34 AM
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DOCHAGERTY
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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.
Jun 11, 2010 at 11:14 PM