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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 12-19-2004, 02:36 AM   #1 (permalink)
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Here they call air-choke, but I'm not sure if it is the throtteling valve...

It is responsible for the start and giving extra air/petrol to the car..

I just wanted to understand it's system and how would affect starting, and what are the sensors related to it?

Any help? ghead
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Old 12-19-2004, 10:19 AM   #2 (permalink)
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In what type of car or what engine management system?
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Old 12-20-2004, 01:47 AM   #3 (permalink)
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1994 320i

If you are asking about the controller it's Seimens. ghead
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Old 12-22-2004, 04:44 AM   #4 (permalink)
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any one can help guys? ghead
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Old 12-22-2004, 06:27 AM   #5 (permalink)
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Hmm.. what gives your car air/fuel.... well.. the fuel rail gives you fuel..that is sent through a fuel pressure regulating valve... and that gets its fuel from the pump... which also passes through a few check valves.. as for the air.. I am not exactly sure about your make and model.. but in general there is a intake valve.. butterfly valve that opens on start to give your engine air... and your idel control valve.. which keeps the right about of pressure inside of your intake manifold with imput to your valve to increase or desrease pressure... this also then ties into your fuel pressure regulating valve.. which is operated with intake mainifold pressure. As for fuel mapping.. that is all does by your ECU... which is a OBD-I system..

Good Luck,

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Old 12-22-2004, 06:33 AM   #6 (permalink)
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Sounds good

but what sensors are linked to the butterfly valve? I'm doubting it's either the valve or the controlling sensors...

Since the controller is not showing any errors.. I'm guessing that the sensors/valve are working but giving wrong readings or something...

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Old 12-22-2004, 06:58 AM   #7 (permalink)
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Not real sure what sensors are linked to your valves and all.. as I dont own that year/model... but maybe if you told us what your problem was we might be able to help a little more...

Good Luck,

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Old 12-22-2004, 07:11 AM   #8 (permalink)
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There is a TPS Throttle Position Sensor hooked up to your butterfly. If it was out of range, even an OBD1 system would pull a code.

As for air during idle, your ICV Idle Control Valve controls the amout of air let in during idle. It may or may not pull a code on an OBD1. I don't know anything about them.

Is your car on the crapper? What are the symptoms?
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Old 12-22-2004, 07:49 AM   #9 (permalink)
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The problem is a weird one...

When the car is cold (early morning, and late night) if I give it any push above 2k rpm it gives this weird sound, as if the engine is not getting petrol and/or air in a smooth way (i.e. as if there is a valve that is opening and closing randomly).

Then after 10 to 30 min. (randomly everyday) it becomes perfectly fine as long as it is hot... and it comes back after complete cool down.

This again happens in an increasing manner, i.e. everyday it becomes worse and it takes longer to stabilize.

I tried 3 times to change the air/rpm choke (as they call it here) (which probably is the butterfly valve) with a second hand one... the problem goes for one or two days and it comes back again....

The recent thing I noticed, is that I start the car (cold start) and it is perfectly fine, and the problem happens 2-3 min. after....

Really weird, but I feel it's related to a faulty piece that is kinda half functioning.

What do you think guys?
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