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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Jumping revs, rough idle, and stall on cold start?



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      07-15-2014, 10:01 AM   #1
joekitch
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Unhappy Jumping revs, rough idle, and stall on cold start?

here's the video evidence, more information about the symptoms is in the video description.
i'll upload another video of the jumping revs if i can catch it. some mornings it'll just stall on the first start then work fine on the next one. some mornings it'll sit there cranking forever until i attempt a second start. some mornings the revs will dance all over the place until it stalls out.

but it almost always starts on the third attempt and runs fine from then on?

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      07-15-2014, 10:46 AM   #2
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oh and i did some preliminary research, one of the common things cited for issues vaguely like this was VANOS problems
as well as possibly the camshaft position sensor
and maybe a bad coil/spark plug
do you guys agree?
and ideas as to how i would go about ruling out each of these problems?
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      07-15-2014, 11:56 AM   #3
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Could be quite a few issues. Are you getting any codes? Try reading the codes first.

If you're getting a misfire then its probably plugs, coils, or injectors. To test: move the coil from the cylinder thats misfiring to a cylinder that isn't. If the misfire moves to the new cylinder then you have a bad coil.
If not, move the spark plug from the misfiring cylinder to another cylinder. Again, if the misfire moves with the swap then you have a bad spark plug.
Finally move on to injectors.

Your VANOS might need to be cleaned so you could try doing that too.
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      07-15-2014, 12:09 PM   #4
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No codes/CEL's? When the idle dances, is it rough? I would try smelling the exhaust when it's exhibiting this behavior, it will be a dead giveaway for misfires if you smell something unusual. Checking the eccentric shaft sensor(under engine vanity cover) for oil contamination would also be a good idea.
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      07-15-2014, 12:13 PM   #5
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yea, got to auto zone and see if it spits out any codes and keep us updated.

hope its an easy fix!
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      07-15-2014, 02:01 PM   #6
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All of your suspect parts are correct. Could be any of those things though. From what I've read the very rough idle on cold start or no start condition is usually the Eccentric Shaft Sensor, but start with seeing if there's codes and go from there.

I recently had all my coils replaced for rough idle on warm re-start. Found out 2 of them were firing with less power than the others....your issue looks to be more significant than what I experienced.

Also you can use RealOEM.com to find BMW part numbers specific to your car, then google and check the retailers who have them to find the best price.
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      07-15-2014, 05:14 PM   #7
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just did a code scan with my little $5 bluetooth code scanner and the Torque app for android

the only code found was P1017
http://engine-codes.com/p1017_bmw.html
looks like you guys were dead on about the eccentric shaft sensor

HOWEVER; are there any other problems that can masquerade as a P1017?
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      07-15-2014, 05:48 PM   #8
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also, assuming i've been getting these symptoms every morning for the past week or so.....
how time sensitive is this?
I assume this should be done ASAP or at least this weekend at the latest, right?
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      07-15-2014, 08:39 PM   #9
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The problem is that the gasket for the sensor degrades, and allows oil to contaminate its connection port. Replacing this gasket, along with the valvetronic motor gasket and valve cover gasket would take care of the leaks. You can try cleaning the connection plug out before doing all of this work, but the oil can kill the sensor overtime. If the sensor is bad, you will want to replace it while the car is apart.
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      07-16-2014, 06:27 AM   #10
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Try chevron techron fuel injector cleaner (concentrate).
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If no codes are being thrown use Chevron Techron fuel injector cleaner (concentrate). It solves rpm fluctuating upon cold start-up. Also, for most BMW problems start off by scanning your car with the Peake Research Tool. It contains the actual BMW codes. If you want to register a newly installed battery for free (just buy a $10 cable) and google/download BMWLogger
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      07-16-2014, 08:03 AM   #11
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Quote:
Originally Posted by thomas88162 View Post
The problem is that the gasket for the sensor degrades, and allows oil to contaminate its connection port. Replacing this gasket, along with the valvetronic motor gasket and valve cover gasket would take care of the leaks. You can try cleaning the connection plug out before doing all of this work, but the oil can kill the sensor overtime. If the sensor is bad, you will want to replace it while the car is apart.
hmm, any links to videos or pictorials showing how to get to the sensor plug so i can check if its dirty?
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      07-16-2014, 10:24 AM   #12
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and here's another video

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      07-16-2014, 01:29 PM   #13
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I'd do or get all those gaskets done since you'll be in there for the eccentric shaft sensor/gasket. I was lucky and only my gasket needed to be replaced (under CPO).

Glad you have a code because that's pretty specific.
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      07-16-2014, 02:05 PM   #14
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In the first attached picture, remove the four bolts holding the vanity cover on. The cover will slide off of the engine, and then the eccentric shaft sensor plug is the green arrow in the second attached picture
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      07-16-2014, 05:01 PM   #15
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oh, i thought you had to go through all the crap of removing the cabin filter and that crossbar, i didn't realize you could literally get the vanity cover off right there
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      07-16-2014, 05:24 PM   #16
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Have the same problem but in a harder way.... put a pics of the codes
At first start it shuts down and in a second start i start revving like in the video until the engine is warm...

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      07-16-2014, 06:14 PM   #17
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Quote:
Originally Posted by Kewill0360 View Post
Have the same problem but in a harder way.... put a pics of the codes
At first start it shuts down and in a second start i start revving like in the video until the engine is warm...

Your problem seems to be the camshaft sensor.
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      07-16-2014, 07:53 PM   #18
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Quote:
Originally Posted by Chriztofor View Post
Your problem seems to be the camshaft sensor.
Hope it's man dealer told me it was the throttle body and dmtl pump...

Charging me $976.50 for Throttle body replacement & $388.50 for Dmtl pump


I bought the Throttle body,Dmtl pump & R/R window regulator w/ motor from a 2011 328i for $235 and they charging me that Fuck them.... I replace the Throttle and the problem is not gone so they trying to hit me with that bill, but they not getting that money $$$$$

snap some pick of the eccentric Shaft Sensor since i read some people talking about it so i went and open the hood..

Shit is dirty like a moda f....

any cleaning ideasssss
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      07-17-2014, 08:47 AM   #19
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I followed this guy:



I was having a different kind of problem and even after doing the valvetronic motor and gasket, eccentric shaft AND valve cover gasket...my problem ended up being the valve cover itself. A full saturdays worth of work should have you up and running.

Also, I've heard unplugging and plugging the eccentric shaft with oil in it can cause problems with other things...thoughts?
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      07-17-2014, 10:26 AM   #20
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Quote:
Originally Posted by StereoSteve View Post
I followed this guy:



I was having a different kind of problem and even after doing the valvetronic motor and gasket, eccentric shaft AND valve cover gasket...my problem ended up being the valve cover itself. A full saturdays worth of work should have you up and running.

Also, I've heard unplugging and plugging the eccentric shaft with oil in it can cause problems with other things...thoughts?
If you don't clean the area up, it will make it more likely to foul the receptacles. So, don't be lazy if you find oil on it
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      07-18-2014, 04:41 PM   #21
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Quote:
Originally Posted by StereoSteve
I followed this guy:



I was having a different kind of problem and even after doing the valvetronic motor and gasket, eccentric shaft AND valve cover gasket...my problem ended up being the valve cover itself. A full saturdays worth of work should have you up and running.

Also, I've heard unplugging and plugging the eccentric shaft with oil in it can cause problems with other things...thoughts?
Lucky me i dont have the cowl install...
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      Yesterday, 01:30 AM   #22
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bump for more information;

i need to know if a repair on this can wait until next weekend.

i dont have enough time after work to do this job, i can only do it on saturday/sunday and i was not able to get the part i needed this past weekend

at what point will my engine just refuse to start or go into limp mode?
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