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E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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  #1  
Old 02-05-2013, 04:28 AM
jrblanks jrblanks is offline
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Location: sherman, tx
 
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Mein Auto: Z3
Z3 engine while idle surges

My Z3 when stopped seems to be surging and when the headlights are on they cut in and out when this happens. Any ideas? I just replaced the water pump and thermostat.
Thanks for the help.
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  #2  
Old 02-06-2013, 05:52 AM
aba4430 aba4430 is offline
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Quote:
Originally Posted by jrblanks View Post
My Z3 when stopped seems to be surging and when the headlights are on they cut in and out when this happens. Any ideas? I just replaced the water pump and thermostat.
Thanks for the help.
Simple thing to check is your gas tank cap seal. If the seal is worn out it will lead to surging during idle.
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Old 02-06-2013, 06:22 AM
jrblanks jrblanks is offline
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Okay, thanks. I will purchase a new gas cap today.
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Old 02-06-2013, 06:32 AM
aba4430 aba4430 is offline
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The cap will be expensive; the seal can be replaced separately (~$6).
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Old 02-06-2013, 06:34 AM
jrblanks jrblanks is offline
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Do you know if I can purchase the seal at a local part store like AutoZone or is it a item that has to be bought from BMW?
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Old 02-06-2013, 06:44 AM
aba4430 aba4430 is offline
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I recommend the local dealership. Should be an in-stock item. Make sure you have the OEM cap, if not the seal (OEM) might not be compatible.
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Old 02-06-2013, 07:45 AM
jrblanks jrblanks is offline
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Okay, thanks.
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Old 02-06-2013, 02:14 PM
ashevillez3 ashevillez3 is online now
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I'm having a similar issue but only at start up when cold. After car warms up surging goes way. My first thought is the car needs a robust tune up... plugs, fuel filter, air filter already changed. No codes showing up. Just thinking out load but have you tried pulling codes and is maintenance up to date?
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