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Old 11-05-2013, 10:47 AM   #1
Sea Aych
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Rough idle on cold (<10 degs outside) starts for 30 seconds

Since it's starting to consistently dip below 10 degrees here, my '89 325i has started acting up a little when started. If it's below 10 degrees, the car starts up just fine, idles around 600-650, which is good, then as soon as i start to move, the idle after that starts to be extremely loopy and wants to stall, dropping down to 300-400 then jumping back up to 1000.
Only happens for about 30 seconds while i'm in first pulling out of the driveway and lane near my place in 1st and 2nd gear. Once it's up driving at at least 1500rpm for that 20-30 seconds or so it idles fine after that (engine is still cold at this point).
Never happened during the fall or summer - only really started when the temps started to drop below 10 in the past couple weeks...

Any ideas? Really don't want to start checking for vacuum leaks, but i'm going to take a look at the ICV and intake boot today after work, maybe the screw on the icv is in too far making the car "look" a little for the idle when it just starts. Who knows!

Thanks!

Last edited by Sea Aych; 11-05-2013 at 10:52 AM.
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Old 11-05-2013, 11:00 AM   #2
Yamahammer
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Could be the CTS for the dme. But you can also test your ICV. There are instructions on how to do this in the Bentley. The surging idle is strange, but it is not uncommon to see these things like shitty when that cold.
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Old 11-06-2013, 09:00 AM   #3
cirrusblau
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Try cleaning the ICV and lubing with light oil. It's got to be able to turn freely and if it's gummed up, it'll overshoot, and then overcorrect the opposite direction
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Old 11-06-2013, 11:00 AM   #4
Sea Aych
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^ think it's that? It's just weird because it doesn't jump around until I move for the first time. It starts up and idles fine and if I let it sit for 20-30 seconds then start to move then it doesn't jump at all. I'll give it a look though. Thanks!

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