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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, May-14-2017, 06:01:08 PM   #1
19shaun79
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Default Exhaust camshaft position sensor issues...

it all started after a trip to calgary and edmonton and back to winnipeg last summer. When I got home the engine sounded very ‘ticky’ so I opened it up and checked the valves. A lot of them were out of tolerance, so I adjusted them. I did not remove the VANOS to adjust the valves.
Once I put it all back together, did an oil change and started it up, I got a code - Exhaust camshaft position sensor. The symptoms were quite intense when I started it up - pushing the gas pedal resulted in a ‘bog’ of the engine before climbing in revs. It did not stall and it idled fine.
So I replaced the sensor and started it back up. Once again the car idles fine, seems to climb in revs fine. I took it for a drive yesterday to try to go through a drive cycle with it. The car feels sluggish (like not as fast as my Focus ST), granted I haven’t driven the Bimmer since last August and they are two different cars with different characteristics. The Bimmer just feels slow now. no ‘bogging’ when I hit the gas pedal, but not that ‘throw you back in the seat’ feeling I remember it having last summer.
AND there are codes remaining! It’s showing:
B9 - Function Exhaust VANOS
OF - Camshaft sensor synchronization to camshaft
OA - Signal, camshaft sensor, exhaust

For reference: I have the BEISAN solenoid, and have done all the VANOS lock downs there are. I have headers, no cats, and a FSTT tune. I have deleted the SAP, but still sometimes pop a code for it.

Do I need to time the engine? Should I check the VANOS, even though there is NO WAY that there should be anything wrong with it? What’s going on??

Thanks in advance…
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Old Sun, May-14-2017, 07:13:26 PM   #2
Drewster
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Default Re: Exhaust camshaft position sensor issues...

Quote:
Originally Posted by 19shaun79 View Post
it all started after a trip to calgary and edmonton and back to winnipeg last summer. When I got home the engine sounded very ‘ticky’ so I opened it up and checked the valves. A lot of them were out of tolerance, so I adjusted them. I did not remove the VANOS to adjust the valves.
Once I put it all back together, did an oil change and started it up, I got a code - Exhaust camshaft position sensor. The symptoms were quite intense when I started it up - pushing the gas pedal resulted in a ‘bog’ of the engine before climbing in revs. It did not stall and it idled fine.
So I replaced the sensor and started it back up. Once again the car idles fine, seems to climb in revs fine. I took it for a drive yesterday to try to go through a drive cycle with it. The car feels sluggish (like not as fast as my Focus ST), granted I haven’t driven the Bimmer since last August and they are two different cars with different characteristics. The Bimmer just feels slow now. no ‘bogging’ when I hit the gas pedal, but not that ‘throw you back in the seat’ feeling I remember it having last summer.
AND there are codes remaining! It’s showing:
B9 - Function Exhaust VANOS
OF - Camshaft sensor synchronization to camshaft
OA - Signal, camshaft sensor, exhaust

For reference: I have the BEISAN solenoid, and have done all the VANOS lock downs there are. I have headers, no cats, and a FSTT tune. I have deleted the SAP, but still sometimes pop a code for it.

Do I need to time the engine? Should I check the VANOS, even though there is NO WAY that there should be anything wrong with it? What’s going on??

Thanks in advance…
You need to diagnose it with a scan tool that shows you current camshaft position, and can run it through the Vanos test.

If the tool shows a good, consistent camshaft position reading, but the Vanos test shows your exhaust cam didn't move at all, you probably need to clean out the valve body and/ or get a new solenoid from Raj.
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Old Tue, May-16-2017, 05:25:42 AM   #3
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Default Re: Exhaust camshaft position sensor issues...

Run the Vanos test on DIS, it helped me pinpoint a similar problem.

My similar problem although on the intake side ended up being the valve body, it must have gotten plugged while I was doing the 'cleaning' procedure. Never could get it clear again. Replaced Valve body and 100%.
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Old Fri, Jun-30-2017, 09:02:52 PM   #4
19shaun79
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Default Re: Exhaust camshaft position sensor issues...

Well, life has a habit of getting in the way of me and my M3.

I had a friend do some tests on the car and he suggested that the exhaust cam was retarded. I opened the engine back up and checked it and sure enough that cam was way out of time. I fixed that, timed the top and bottom.

When I put it back together I cleared the codes, went for a drive and it felt better. No codes came back. The next morning I went to drive it to work and the codes popped up right away. Same codes as before.

Now when I stab the throttle it still has a bit of hesitation. Not as bad as before, but noticeable to me.

I haven't had time to run the DIS VANOS test yet, but I guess that is my next step. At least now I know that the engine is timed properly.

I will update when I have the VANOS test completed.
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Discussing Exhaust camshaft position sensor issues... in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)