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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 02-01-2007, 11:55 PM   #1 (permalink)
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More ICV questions...

Hey just a quick question on an old '90 325i I'm working on. The problem is a high idle. Does anyone know off hand if the (three wire) ICV is suppose to close if it is unplugged with the engine running? It would make sense that it does but this one doesn't and the idle is racing above 1,000 rpm, 2,000 with the A/C button depressed. I assumed the ICV piston was spring loaded to return to the closed position when power (plug) was removed. I pulled the plug off but had to tap it with a screwdriver handle to get it to close and drop the idle back to the baseline setting. Or I guess if anyone else has run across this and has the fix that would help too. I removed the ICV and sprayed it out with Amsoil PowerFoam, so it's shiny clean inside and moves freely. But I thought maybe there was a spring broke inside or something. Anybody got a three wire ICV they can go unplug and tell me what happens? I left it unplugged for now. Idles a smooth 700 rpms.




Thanks.


-Mike

Last edited by Hamfisted; 02-02-2007 at 12:11 AM.
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Old 02-02-2007, 07:26 PM   #2 (permalink)
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Check your throttle position switch first, but there is a good chance your ICV is bad.
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Old 02-02-2007, 08:13 PM   #3 (permalink)
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You called it right!

You called it right! This morning I went out and ran the tests on the TPS and it was dead. Both idle and WOT positions were dead. New TPS installed ($65) and all is well again. It may have been going bad for several months now and finally just died. Thanks for your response.





-Mike
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