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Discussion Starter · #1 ·
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!!!:help:help
 

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Crazy Fabricatin' Admin
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:welcome

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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Help from over the pond
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Welcome, as said check for vacuum leaks is the first port of call...
 

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Discussion Starter · #4 ·
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
 

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42, The meaning of life
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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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Ich bin der Modifikator
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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.


jb :)
 

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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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