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View Full Version : surging/hunting idle when cold..help!



romeox929
03-03-2007, 03:52 PM
for the mechanic heads, i have this problem with idle ...only when starting up and warming up. when i started it before, it was just any normal smooth RPM sound. now, it hesistates a little when i get it to start. i have this surging idle which beats up and down about every second but when i go on the gas, it disappears. ive changed out the spark plugs and the problem still persists. also, about a month and a half ago, i changed out the ICV...maybe it got dirty again? im wondering the o2 sensor or timing. anybody help me out?

btw, its a m50 525i

DaveVoorhis
03-03-2007, 04:29 PM
Might be a vacuum leak. First check is the intake boot. Cracks, especially where the ICV and PCV hoses connect, are common.

romeox929
03-03-2007, 07:02 PM
do you have part numbers on hand?

DaveVoorhis
03-03-2007, 07:19 PM
http://realoem.com