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X3 E83 (2004 - 2010)
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  #1  
Old 08-21-2016, 06:04 AM
BMWaufKS BMWaufKS is offline
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Question N52 idle rough ~15 seconds on cold start

I'm not a perfectionist, but play one on TV, when it comes to engines ...

This summer I've noticed the N52 doesn't idle well after its first start. About 15 seconds later it's fine. There's no codes. The vehicle is stored overnight in a fairly hot garage, so maybe it's just vapor lock? Leaking injector? Or just normal for this N52?

Has/have already done:

quality premium gas (+just put Techron in the tank yesterday)
cleaned the MAF yesterday
newer air filter
replaced the coils and plugs
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  #2  
Old 08-21-2016, 06:38 AM
swampX3 swampX3 is offline
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post 2 ????...check for loose/oiled electrical connectors/plugs etc

http://www.bimmerfest.com/forums/sho...d.php?t=926923


partial quote below .....


" There was an oil film residue spreading out from the eccentric shaft sensor/seal. Unplugged the sensor and saw a little tiny bit of pooled oil resting in the plug well. Cleaned it out with some 91% alcohol soaked q-tips followed by some dry q-tips. Also sprayed out the female plug. Let everything dry out for an hour or so while I poked around the rest of the engine. I also wiped off the eccentric shaft seal with a rag as best I could but it'll be replaced soon anyway. "

Last edited by swampX3; 08-21-2016 at 06:39 AM.
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  #3  
Old 08-21-2016, 03:23 PM
abscate abscate is offline
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If it's repeatable and goes away on the same timeframe don't worry about it.

Google " car wash syndrome" or " lawn mower syndrome" to learn more about how oil is an integral part of compression on German motors
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  #4  
Old 08-21-2016, 03:25 PM
bluskye bluskye is offline
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You can replace the eccentric shaft sensor oring/seal so easily, it should be a preventive item. It does not require the valve cover coming off.
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  #5  
Old 08-21-2016, 03:55 PM
BMWaufKS BMWaufKS is offline
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Quote:
Originally Posted by abscate View Post
If it's repeatable and goes away on the same timeframe don't worry about it.

Google " car wash syndrome" or " lawn mower syndrome" to learn more about how oil is an integral part of compression on German motors
Unless its an issue with the lifters not pumping up, doesn't sound like this problem. Starts fine, and the vehicle has been sitting all night. Just a rough idle briefly.
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  #6  
Old 08-21-2016, 04:24 PM
dukedkt442 dukedkt442 is offline
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N52 idle rough ~15 seconds on cold start

I've noticed a similar issue with mine, but only when there's been a significant change in temperature, pressure or humidity between when the car was last run and subsequently started. The worst was when it was 80* when I put the car to bed and 37* the next morning when I started it. I usually try to turn the key to on without starting for 5 seconds to let the MAF take readings and adjust accordingly.
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  #7  
Old 08-21-2016, 05:26 PM
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Just burn it. Burn it and push it off a cliff. Join me.

Haha. If that's your only issue and it's not throwing any codes I wouldn't worry about it too much.

If it starts throwing codes....... Burn it!!!!

(I hope this was helpful)
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  #8  
Old 08-21-2016, 05:49 PM
BMWaufKS BMWaufKS is offline
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Wouldn't be the first time a car of mine has gone up in smoke ...

This summer its garage has often been about 90F; I'm guessing vapor lock that will go away once it cools off outside.

I still have the VCG, etc. to do so I will be seeing that eccentric shaft sensor seal up close and personal someday.
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  #9  
Old 08-21-2016, 06:17 PM
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Everything that I've read leans toward the seal being important to replace but oil in the plug socket points more towards the oil infiltrating the sensor itself and migrating up to the plug. Which means the eccentric sensor is about to crap itself.

When you do your valve cover gasket you might want to consider replacing the eccentric shaft sensor while you are in there. You have to pull the valve cover to replace it and many people seem to damage the valve cover when removing it. Might as well do everything at once (new valve cover, gaskets, eccentric shaft sensor, your first born, etc.,...) so you don't have to mess with it for at least another 5 thousand miles when it starts leaking again. Haha
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Last edited by Q4; 08-21-2016 at 06:25 PM.
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  #10  
Old 08-21-2016, 09:38 PM
joylove joylove is offline
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Possibly perished CCV pipe.
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