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    Help! Can't solve SES, rough idle problem!

    I have a '95 740il that has been running poorly and the SES light comes on in certain cases. When the temperature is above 30 degrees the car runs fine but still has fault codes for the MAF and Lambda control #1 (No SES light). When the temp is between 15 and 30 I get the SES light. When the temp falls below 15 I get O2 sensor #1 and lambda #2 codes as well and the car idles rough and sometimes stalls. Within the past year I have replaced the Cats (the new cats aready sound like marbles), the O2 sensors, the MAF sensor, the intake manifold gaskets, the spark plugs, the valve cover gaskets and even the gas cap. I have checked the ICV and it seems fine. What am I missing? Any ideas on what to try next? Could it be the computer? At this point it might be easier and cheaper just to move to a warmer climate but I can't get my wife to go for that. Please help, it is driving me nuts. Thanks.

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    Re: Help! Can't solve SES, rough idle problem!

    Follow up - I replaced the CPS and cleaned the ICV. I am still getting SES and rough idle when the outside temp is below 15, even when the engine warms up. The codes are for O2 sensors 1 & 2 and Lambda Control 1. I am no longer getting the MAF fault. Anybody have any other ideas?

  3. #3
    Ray7er6ers5er3er
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    Re: Help! Can't solve SES, rough idle problem!

    I'm dealing with a similar issue right now and haven't gotten much help. My SES light just came on after cleaning and reinstalling the Idle control valve. I can tell you (lots of experiance on older BMWs) that you can usually tell if the ICV is sticking by shaking it...it should 'rattle' freely. After cleaning mine idle improved. Now mine only idle poorly (stumbling) when warmed up under load. Checking the codes this week. I'm new to these cars and it looks like a long learning curve.

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    Re: Help! Can't solve SES, rough idle problem!

    I'm having a similar Service Engine Soon (SES) problem also. My codes say Mass Air Flow/Meter. I bought a new MAF cheaply on ebay and it doesn't even have any part # on it and my problem persists. Wondering if it is something as simple and cheap as the O ring p/n 13711731893 or the flat rubber ring p/n 13711736195 that wrap the MAF letting air spin? I've read about Mass Air Flow/Meter from rover m62 4.4 p/n B3130-139283 being identical to eom and alot cheaper in cost. Is this the case? $134 auothausaz vs. Bosch $188 p/n 0280217814 autohausaz vs. stealer $310. hmmm. Advice? thx.

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    Yea, the Rover or VW MAF will work in some of

    the E38, depends on MAF type.
    Peter- S. CA.
    86 Euro635 3.7L, SS MAF, Bilstein& Eibach.
    98 740IL Supercharge AC Schnitzer with Bilstein & HR, NAV & TV.


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    Re: Yea, the Rover or VW MAF will work in some of

    I finally found my gremlin to be a faulty ignition coil. This culprit sure seemed like Mass Air Meter, but was not. I thought cats, all kind of stuff. A simple fix that I could even do...

  7. #7
    electron99
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    Re: Help! Can't solve SES, rough idle problem!

    I have a similar problem. I've cleaned my idle control valve, and it shakes freely. New MAF. I'm going to electrically test the idle control valve next. I understand that I should get 40 ohms across the outside terminals, and 20 ohms from outside to center terminals. Also, should be able to see a smooth change in resistance while moving the valve open and closed, with no dead spots.

    I'm hoping to get to that tomorrow night. Have you had any change in your situation?

    Electron99

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    Re: Help! Can't solve SES, rough idle problem!

    I have had some change. After I cleaned the ICV and replaced the top CPS it runs a little better. I no longer get the MAF fault. Now I just get the lambda sensor and O2 sensor faults. Weather is warmer so that seems to have helped. any other ideas on what to try?

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    Re: Help! Can't solve SES, rough idle problem!

    Sorry... but you need to go back to the drawing board... in spite to have check this and the other determining that nothing wrong with idle control valve and other components... unless you have sophisticate equipment to check condition of those electronic components...



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    How's the spark plugs? VCG leaks? Check Thermo

    sensor for the cold start?
    Peter- S. CA.
    86 Euro635 3.7L, SS MAF, Bilstein& Eibach.
    98 740IL Supercharge AC Schnitzer with Bilstein & HR, NAV & TV.


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    CAVEAT

    Caveat: most likely a few have an understanding how everything works on modern cars… I have mentioned several times upstream… down stream, which may be misunderstood. If so, there are engine components which may or may not generate an error codes such a pulse generator [also known as knock sensors], and the downstream error code would be a deficient catalytic converter, and the problem is not the the catalytic converter. I have talked about engine management components on previous postings... not understood because lack of facts as to what engine management or transmission management is, and all of the problems do to automation [computers], and lack of sophisticated equipment to measure faults or weakness on the system. In essence, cars lack of instrumentation which could provide failure reports as on modern airplanes do.

    A good understanding of OBDII would be helpful to all...



  12. #12
    JeffChia
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    Re: Help! Can't solve SES, rough idle problem!

    Did not see you mention this:

    Did you change
    1. the intake manifold cover (PCV) at the rear with the gasket
    2. Front intake gasket
    3. check for cracks in the intake boot from the aircleaner to the throttle body

    If so, try retorquing the intake manifold bolts. Get a torque wrench and do not do it by feel as some people have cracked the composite manifold that way.


  13. #13
    eduy
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    Re: Help! Can't solve SES, rough idle problem!

    I had a problem with rough idling specially when the engine is cold. check engine light keeps coming out. Finally a sensible mechanic here in orange county ca looked at it. He plugged in smoke to one of the vaccum hoses and smoke came out of the air intake manifold. Changed the seals and everything worked out well.

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