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General E46 Forum
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Old 04-08-2010, 06:15 PM   #1
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Vanos symtom ?

I bought my 00 323 with 69k Im currently at 86k and I think its vanos time but i need some advice to be sure. Its been happening recently when i start it up(engine dead cold) The Idle is very rough and the rpms fluctuate about 1100-800 for about 15 sec and it goes back to perfect idle. If i drive right away it hiccups occasionaly till warmed. I have a k&N 57 intake and i can hear when i go wot it isnt a smooth roar its kinda sloppy. No codes and it feels a little slower. Ive done some searching it seems like vanos just need some final input on my symptoms before i replace the seals. Thanks in advance. Btw i did a major tune up around 72k so thats out of the question. oops forgot the p in my title

Last edited by Bdubbin; 04-08-2010 at 06:17 PM.
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Old 04-08-2010, 06:19 PM   #2
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Have you checked your air inlet tube after the MAF, right where the tube elbows off to the CCV. They like to crack there & it would cause the same symptoms you are describing. Chas
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Old 04-08-2010, 07:00 PM   #3
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But wouldn't the false air entering the intake be a problem all of the time?
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Old 04-08-2010, 10:41 PM   #4
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Old 04-08-2010, 10:53 PM   #5
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OK here is your test.

1. On a cold morning, start your car, and watch the rough idle kick in, then turn off the car.
2. Unplug your vanos electrical connector. Its to the right of the vanos, on the driverside of the engine near the top (search for DIY on this)
3. Start your car again, and watch the idle be perfect

This means its your vanos. If you unplug the vanos electrical connector and the idle stays rough, then its not he vanos.

Simple as that.
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