E36 323 Oil in the intake manifold . . . . . . . . . .
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  1. #1
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    Oil in the intake manifold . . . . . . . . . .

    Car is down on power and suffering from a notable increase in engine breaking down to about 1000rpm.

    Car shows no codes and car slows to a stop as it should in neutral (no caliper issues). Removed throttle body and it was filthy inside all around the butterfly. What was also immediately obvious was that there was oil in the inlet manifold, enough to put my fingers in there and have a reasonable amount on my fingers.

    Is this a failed CCV?

    As well as cleaning the throttle body I also cleaned the ICV which was a little gunky but not that bad and checked for air leaks, spraying carb cleaner over the pipes once it was back together and running just to double check and see if there was a change in revs etc.

    Bit stumped. CCV doesnt make a noise when removing the filler cap and doesnt seem to have too much suction (i think!).

    Cheers!
    Last edited by Seismic22; 03-12-2012 at 22:18.

  2. #2
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    If it is the original CCV then I would replace it.
    Is your engine a Nikasil engine? (I may have asked this before but can't remember)
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    Seismic22 (17-12-2012)

  4. #3
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    Quote Originally Posted by Ronnie View Post
    If it is the original CCV then I would replace it.
    Is your engine a Nikasil engine? (I may have asked this before but can't remember)
    Thanks for the reply,

    Nope, its got the later unit (with steel liners?), the car leaving the factory early 1998.

    I have now changed the CCV unit and it has made no difference! Couldnt spot any air leaks anywhere either!

    Its had a new crank sensor couple of months ago (oem bmw) and I consider the cam sensor to be ok, no codes show up at all!

    Have also tested the TPS and it seems to be ok.

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    Ronnie (16-12-2012)

  6. #4
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    Oil in theinlet manifold has to come through the breathers. However, some is to be expected
    Quote Originally Posted by Seismic22 View Post
    Car is down on power and suffering from a notable increase in engine breaking down to about 1000rpm.
    There is no engine fault that can be expected to increase engine breaking, therefore suspect drag in the drive line, normally brakes.
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    Seismic22 (17-12-2012)

  8. #5
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    Quote Originally Posted by e36coupe-328 View Post
    Oil in theinlet manifold has to come through the breathers. However, some is to be expected

    There is no engine fault that can be expected to increase engine breaking, therefore suspect drag in the drive line, normally brakes.

    OK, thanks, ill asume what I can see is normal.

    Could you suggest any other likely drive line drag? I changed the front calipers only a month or so ago so cant imagine its these. At the same time I had the rear up in the ear (to bleed the system) and the wheels seemed to turn freely.

    Thanks.

  9. #6
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    is the "engine breaking" the same from cold ?
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  11. #7
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    Quote Originally Posted by e36coupe-328 View Post
    is the "engine breaking" the same from cold ?
    Sometimes I think so and sometimes I don't, I couldn't give a sufficiently accurate answer really.

    Jacked the back of the car up again tonight and span the real wheels with handbrake off and car in neutral. With a reasonable amount of force applied but nothing Hulk like I could spin each wheel but both would only rotate 1 - 1.5 times before coming to a stop. Is this correct and the drive train drag has to be accounted for or is that nowhere near as free as it should be?

    Jacked up the front as well and span both wheels and both of them just span forever.

    Just to reiterate the car only has the increased "engine braking" feel when in gear, stick the car in neutral and it seems to roll to a stop completely normally. The "engine braking" feeling occurs as soon as the throttle is completely released. This occurance continues until somewhere between 1000 - 2000rpm where it feels like something suddenly "releases" and the car then coasts to a stop as it should. Alongside this symptom the car feels as thought its strangled/something is holding it back across the entire rev range and through all gears and as such the induction noise is deeper and sounding very similar to when my old 323i had a blocked CAT. This is the third CAT i have fitted to this car (for reasons other than these symptoms) and I am confident that it is not blocked (for info it is a 328i CAT and back box).

    Thanks.

  12. #8
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    Quote Originally Posted by Seismic22 View Post
    Just to reiterate the car only has the increased "engine braking" feel when in gear, stick the car in neutral and it seems to roll to a stop completely normally. The "engine braking" feeling occurs as soon as the throttle is completely released. This occurance continues until somewhere between 1000 - 2000rpm where it feels like something suddenly "releases" and the car then coasts to a stop as it should.
    Hmm sounds to me like it is just you overthinking the fact that the engine cuts fuel on the overrun andonce slows to idle speed the engine runs on fuel again and of vcourse by then you hit the clutch before stalling.
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  13. #9
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    Quote Originally Posted by e36coupe-328 View Post
    Hmm sounds to me like it is just you overthinking the fact that the engine cuts fuel on the overrun andonce slows to idle speed the engine runs on fuel again and of vcourse by then you hit the clutch before stalling.
    I understand that it could come across like this but theres two things that confirm this isnt the case,

    1. Very occassionally the increase in deceleration briefly does not occur and power does return.

    2. Up until I sold it, I ran my old 323i back to back with this one and so its quite clear to me something is not right.

  14. #10
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    Quote Originally Posted by Seismic22 View Post
    1. Very occassionally the increase in deceleration briefly does not occur and power does return.
    Sounds like that is the oddity. If you expect the car to slow as if it is out of gear that is a wrong expectation
    When the problem is present if you slow and experience the problem, then try neutral, then try slowing in gear, when in neutral did it slow as you expected?
    If so.........
    1) In neutral, clutch pedal up, the engine is bound to the gearbox input shaft but the rest of the driveline is disconnected so you have eliminated brakes, rear axle and most of the gearbox
    2) The problem is definitely input shaft or engine OR perception you definitely DO NOT have power on the overrun when slowing down so "power does return" is out of place.
    Quote Originally Posted by Seismic22 View Post
    2. Up until I sold it, I ran my old 323i back to back with this one and so its quite clear to me something is not right.
    Maybe your other was wrong / down on compression whatever, you need best two out of three of for that to be an accurate test
    Last edited by e36coupe-328; 18-12-2012 at 08:08.
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