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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 02-18-2009, 08:18 AM   #1 (permalink)
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need help with hard start problem

I have a 00 323i and when the engine is cold it is very hard to start. You have to crank alot and the car will only hit on 2 or 3 cylinders then when it catches it still misses and sets the misfire codes. However after it starts if you turn it off and fire it up again it runs perfect. You can clear the codes and drive it all day with no problem then the next morning same thing. Here is what i have done: New plugs, checked coils all were .8 ohms checked resistor boots all were 2k ohms, installed new plugs, installed new vanos o-rings unplugged mass air meter (still hard to start) changed intake boots and cleaned throttle body with it on the car. The problem started after i got a code for stuck throttle body and car went into limp mode so i changed intake boots and sprayed tb with cleaner until i got it working smooth now i have the hard start problem. Also i checked intake air temp sensor and coolant temp sensor with a scanner when car was cold and both showed 37F which was close to outside temp that day. Sorry for long post but i have been working on this problem for about 2 weeks now and have tried alot of things with no solution.
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Old 02-18-2009, 11:02 AM   #2 (permalink)
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Fuel rail pressure drop or non return fuel valve up the creek ??
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Old 02-18-2009, 12:08 PM   #3 (permalink)
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fuel psi is 55 running, drops to 45psi with engine off and it held that pressure for about 5 min while i watched it then i disconnected the gauge. What do you mean by non return fuel valve?
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Old 02-18-2009, 12:39 PM   #4 (permalink)
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Non return value is part of the fuel system, but seems to be fine as your pressure is holding although there is a big difference between running and standstill, do you have any sort of whinning under the hood when it does start in the morning as you may have a vaccum leak on you intake, it may also be your secondary air pump.
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Old 02-18-2009, 08:09 PM   #5 (permalink)
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I probably should check for a vacuum leak but i haven't because the car runs so good after you get it going. Is there a way to bypass the air pump or some kind of test for it? The air pump was supposed to have been replaced when I bought the car about 10k miles ago.
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Old 02-19-2009, 02:59 AM   #6 (permalink)
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Google it, you should find loads of info on the subject.
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