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#1 (permalink) Old 12-30-2009, 03:30 AM
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Angry Hi BMW Enthusiasts!!

Just bought a 1999 528i and is in good condition...Just had to remove intake mainfold to replace upper heater pipe changed oil and spark plugs now i have an erratic idling problem when i stop at lights or after going above 50mph...Also when i initially step onthe gas i hear and feel a slip like maybe an air pocket in the gas pedal....what oh what could this be...i'm stumped please help!!!
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#2 (permalink) Old 12-30-2009, 09:49 AM
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It sounds to me like you have a vacuum leak somewhere. This is exactly what happens when you have a vacuum leak. First thing is to check all the hoses, especially the ones going to the ICV...second...did you replace the intake manifold gaskets? at 170k miles that's pretty much a must.

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#3 (permalink) Old 12-30-2009, 10:09 AM
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Welcome, as said check for vacuum leaks is the first port of call...

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#4 (permalink) Old 01-02-2010, 01:06 PM
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Thanks Got Kraut

Checked for leaks still takes time to shift back into first at stops>>>>>>OMG this is really stumping me...could it be the transmission

Mr Do-it-Yourself ex F-15 mechanic...why can't i fix this
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#5 (permalink) Old 01-02-2010, 04:57 PM
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Welcome to the Werkz. Good luck with this issue. Are you sure you routed the vacuum lines to the correct connections?
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#6 (permalink) Old 01-02-2010, 08:48 PM
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Welcome to the Werkz! What you describe sounds an awful lot like a vacuum issue and unfortunately these cars rely heavily on their vacuum systems.
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#7 (permalink) Old 01-02-2010, 10:28 PM
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Welcome to Bimmerwerkz...... +1 vacuum, check that throttle body to air intake boot also, mine did crack when I removed my manifold in the M50 swap.


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#8 (permalink) Old 01-04-2010, 06:14 PM
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Vacuum leak.
You should check all of the hose connections you removed to make sure they are tight.
Your service engine light may also come on, to indicate you have a lean cylinder mixture, as air may be bypassng your mass air flow meter
If you have a leak at your manifold joint and you can't hear it or find it easily, you can take a can of starter fluid and spray where you think the leak is, you should hear a noticeable change in the idle speed.
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