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40 Posts
Thank you for all your advice. It is resolved.
E39 cold start problem - resolved with a restart?
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Thank you so much for all your generous help and advice.
Hey! I'm having an identical problem with my 2007 e90. Starts up, runs rough; If I turn it off and back on, the rough running goes away. Can you tell me what was the ultimate fix for you?
Thanks,
ToddinMA
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40 Posts
ToddinMA,
Great question, we are replacing the oxygen sensors and camshaft position sensors. This has not yet occurred, but that was the suspected cause.
If your BMW is throwing those codes, that may help.
Great question, we are replacing the oxygen sensors and camshaft position sensors. This has not yet occurred, but that was the suspected cause.
If your BMW is throwing those codes, that may help.
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6,323 Posts
are you getting CEL or has the DME been read for codes? if any codes, make note of em and list on here, then clear em and see what comes back. kinda hard to tell just by symptoms, different things come to mind from your post. read or have em read by a BMW specific scanner, many generic OBDII readers wont pull up pending or inactive codes, those can and probably are important.
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Hey again, I'm not the mechanic and he's occupied today and we'll replace the sensors and see if the cold start problem persists.
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166 Posts
Welcome . I suffered from these problems as well, and I checked with a scanner, and the malfunction was the oxygen sensor, and I replaced it with this, the operation did not improve, and I checked the spark plugs and their connections, and cleaned the fuel injectors. Well, this is something crazy. According to my personal opinion, there is a sensor or a piece that works when it feels Warm only
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40 Posts
We replaced two oxygen sensors and crankshaft sensors and the vehicle is starting better. I still have a hard start occasionally so we will also be replacing the camshaft sensor and see what happens.
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40 Posts
My 2002 530i simply won't start below 45 degrees F. What are the usual causes of this? It starts instantly when it warms up, so I am not sure where to look. I already paid the mechanic to replace the mass airflow meter, the oxygen sensors...so that did not work. I'd like to save money by trying less expensive solutions! Any ideas?
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40 Posts
Me too. I was in San Jacento and it became very cold and my vehicle did not start. After the outside air rises above 45, it started. I am back to the drawing board.
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Here are the codes coming out right now.
![Line Font Gas Technology Temperature]()
![Bicycle accessory Material property Measuring instrument Gas Font]()
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Neither of those parts has been replaced. Would these two items cause the engine to not start at all under 45 degrees and start instantly after 45 degrees?
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6,323 Posts
hard to give a definitive answer from a distance. however i have experienced an intermittent hard start ( dunno if temp came in to play) from a cam sensor, replaced it no other issues since. the cam sensors are a semiconductor device, and can become temp sensitive. in your post #27, you stated that your mechanic was replacing the cam sensor(s). did this not happen? and btw, only replace with OE or OEM parts. many aftermarket parts dont work reliably, last long, some even arrive DOA.
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40 Posts
Hello all, to-date, the mechanic has not fixed my issue.
He has completed all of the following repairs:
What else could the issue be?
The vehicle starts and runs perfectly when the ambient temperature is warmer.
He has completed all of the following repairs:
- replaced two oxygen sensors
- replaced the mass airflow meter
- replaced both camshaft sensors
- replaced the crankshaft sensor
- replaced the fuel filter
- air mass meter boot which was cracked
- brake vacuum valve which was cracked
What else could the issue be?
The vehicle starts and runs perfectly when the ambient temperature is warmer.
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