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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 12-15-2008, 11:16 PM   #1 (permalink)
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Engine revs 3 times on start up

E30 1989 model 325E;
After kangaroo hopping into a service station several months ago, the mechanic replaced the fuel filter, spark plugs and ended up doing a full service. I was told there was a lot of water in the fuel that caused the problem.
Since then the car runs well ecept when I start it up it revs 3 times and then idles, and it does it when it is cold. Has anyone had experienced this and could sugest the cause? The mechanic had no idea.
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Old 12-16-2008, 03:17 AM   #2 (permalink)
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Sounds like the MAF/MAS, which is located between the throttle body and air box,it can be unplugged and cleaned with Meths and give the throttle body a clean while your there, if this doesnt help, a new MAF/MAS, Thats what I would go for 1st.
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Old 12-16-2008, 05:57 PM   #3 (permalink)
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3 revs on cold start

Many thanks Marti for that, please excuse my ignorance what is the MAF/MAS (air flow something?) I will have time during the Christmas vacation to give this a go. I'm guessing the MAF/MAS is located near the firewall under the bonnet?
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Old 12-17-2008, 01:23 AM   #4 (permalink)
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Old 12-17-2008, 03:05 AM   #5 (permalink)
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Originally Posted by djg View Post
Many thanks Marti for that, please excuse my ignorance what is the MAF/MAS (air flow something?) I will have time during the Christmas vacation to give this a go. I'm guessing the MAF/MAS is located near the firewall under the bonnet?
Located between the airbox and throttle body.
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Old 12-17-2008, 07:35 PM   #6 (permalink)
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actually, only 3 revs in cold for a stone cold engine on a 2.5L is good....especially if it is moist or wet out...3 is good I think...
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Old 12-18-2008, 04:50 AM   #7 (permalink)
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Old 12-18-2008, 04:56 AM   #8 (permalink)
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