Click And Hissing Noise From Engine Every Few Mins - BMW Forum - BimmerWerkz.com
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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#1 (permalink) Old 11-21-2004, 09:30 AM
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Hello folks, 1992 325is automatic with about 100k miles, 2nd owner.

Im having 2 problems id like to fix right away.

First problem is a surging idle, sporadic, and slight backfires when accelerating or idling.

Up until a few days ago I didnt have any CEL so I searched the forums to get some ideas. Finally yesterday my CEL came on and (with some effort) managed to read 1221 code (O2 sensor).

So im off to replace the pre-catalyst O2 sensor. From reading the forums it sounds like O2 sensor is a big culprit on this engine.

Okay the second problem is the A/C (i think) keeps clicking on and off every few minutes, when idle, with a slight hissing sound too when it happens. I dont even have the AC turned on. What the hell is this?

Someone suggested that this was normal because the BMW wants to keep the AC ready "just in case" you want to use it right away. hehe this doesnt sound plausible to me.

Thanks in advance for any ideas.
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#2 (permalink) Old 11-21-2004, 08:26 PM
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problem 1) could be a vacum leak causing a lean condition, in turn the DME sets an o2 sensor code.
problem 2) probably the final stage resistor is bad.
HTH

Steve
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#3 (permalink) Old 11-21-2004, 09:36 PM
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How hard is it to repair a vacum leak? I mentioned the surging idle to one of the techs at work and without looking at the car, that was his first guess...

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#4 (permalink) Old 11-22-2004, 07:34 AM
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Quote:
Originally posted by geoff@bmw@Nov 21 2004, 08:36 PM
How hard is it to repair a vacum leak? I mentioned the surging idle to one of the techs at work and without looking at the car, that was his first guess...
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I'll check for a vacuum leak. that would really cause the DME to report bad 02 sensor? wierd!

Thanks much,

Ivan
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