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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 03-08-2006, 09:03 AM   #1 (permalink)
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Airbox - What gives?

Well, the guy who owned my 325i (1989) had a cone filter installed. I changed it back today, to the stock airbox. It now seems that whenever I try accelerate, the engine doesnt get enough air. When I stand over the engine, and rev the it, it sounds as if there is an instant vacuum and then it breathes properly again. I dont have the acceleration or power because of this.
Do I have to change anything on the airbox or the airflow meter? If so - How?
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Old 03-08-2006, 10:56 AM   #2 (permalink)
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What gives is that you just reduced your engine's air supply. There's a reason that people put in cone filters. If you want the extra power, put the cone filter back in.
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Old 03-09-2006, 07:15 PM   #3 (permalink)
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Rip it all back apart again and make sure that there isn't anything that shouldn't be there.
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Old 03-09-2006, 10:09 PM   #4 (permalink)
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Its not a question of not having the power I desire, its a question of not having any power at all, as if I've just bunged up the air intake with a cloth....... BUT....... guess what stupid me didnt do - I forgot to connect the AFM wire back to the AFM - Hence the loud vacuum sound and lack (NO) power.
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