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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Eccentric shaft sensor or valvetronic motor failure?



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      11-18-2014, 06:19 PM   #1
MBP0202
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Eccentric shaft sensor or valvetronic motor failure?

Hi guys,

Looking for some advice from people who have had this problem (probably higher mileage cars...) My car is 2007 E90 328xi with 94,000 miles.

Timeline:

On Saturday, Nov 15th when I tried to start the car (cold engine) when it had been sitting overnight it struggled to start up. It took me 3 times, and then it finally started, car ran fine.

On Sunday, Nov 16th, I tried to start the car (cold engine) and it did the same thing, did not start. Finally got it to start on the fifth try, but now the CEL light is illuminated.

----When the car has been driven and it the engine is warm, the car can be turned off and started with no problem at all.

Yesterday, the car did not start at all. After multiple attempts to start it, it just won't fire up. The fact that it's 20-30 degrees is just making it that much worse

Here are the codes below...



So as you can see, we're either looking at the eccentric shaft sensor or the valvetronic motor as a culprit.

And here's the kicker when I was done replacing the valve cover gasket (70k), I specially ordered a new eccentric shaft sensor gasket to replace the old one. I was so amazed that oil hadn't gotten in there and fouled the sensor that I bought a new one to prevent that from happening. Didn't want to buy a $300 sensor if I could avoid it On Sunday, I also pulled out the eccentric shaft sensor cap to inspect it and there was no oil in there so...

I'll try to get a picture so you can see how clean the sensor connection is and the lack of oil, but since it gets dark and the sun goes down at 4pm and I can't get the car in the garage where the tools are...

Any help is greatly appreciated, thank you.
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      11-18-2014, 07:07 PM   #2
TheAxiom
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Check the fuse first:

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      11-18-2014, 10:08 PM   #3
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Before ordering new parts, check your battery condition and hook up to another car to see if your car starts right away
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      11-19-2014, 01:38 AM   #4
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Sounds like the Eccentric Shaft Sensor. I had an oil leak and it got into it. Pretty soon you'll have to get your car jumped.

http://www.e90post.com/forums/showthread.php?t=1041645
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      11-20-2014, 07:53 PM   #5
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Update:


Finally got the car in the garage and was able to take off the engine cover to get a look at the eccentric shaft connecter, and not much oil in there.








I read a post on another forum that someone had 4 out of the 5 codes that I'm pulling. He replaced the Valvetronic motor and that DID NOT solve the problem so I'm pretty sure it's the eccentric shaft sensor.

I also pulled off the DME/ECU cover and inspected the fuses and they checked out so I think it's time to do the valve cover job again...






I think the oil has fouled the sensor, but since I replaced the gasket up top I'm not seeing it. I'm pretty sure when I take off the valve cover, take out the eccentric shaft sensor and pry off the backing plate I'm going to see something similar to this...




On a good note, besides the sand & dirt, I did not see any pools of oil near any of the coils (not one failed coil yet ) so the Valvetronic motor gasket is holding up well, but it'll be replaced just in case anyways because it has to come off to get to the valve cover. I'll keep everyone posted.

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      11-21-2014, 09:08 AM   #6
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Quote:
Originally Posted by MBP0202 View Post
Update:


Finally got the car in the garage and was able to take off the engine cover to get a look at the eccentric shaft connecter, and not much oil in there.
There shouldn't be any oil, so it seems likely you have narrowed in on at least 1 problem.
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      11-22-2014, 10:39 PM   #7
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Well add another victim to the eccentric shaft sensor column. So if you get the codes I listed above, the lesson is that even though you may not see oil pooled in the connector above, oil has most likely fouled the eccentric shaft sensor underneath the valve cover. This is what I found when I took off the backing plate...







But of course no job is complete without something going wrong, and in this case it was one of the 10mm bolts holding the valve cover on. First one came out no problem, but the other one snapped almost in half

Luckily, it didn't prevent me from getting the valve cover off. Pictures show one side compared to the other. Any ideas on how to remove this?








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