initial start idle issue - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 06-28-2008, 03:44 AM
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initial start idle issue

i have a 92 525i and recently noticed that upon first start of the day that vehicle starts to have engine shake and rough idle. after driving for a bit issue goes away and vehicle will idle fine upon further starts or while at stop lights. previous owner said transmission was replaced fairly recently. what could be the cause?
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#2 (permalink) Old 06-28-2008, 09:16 AM
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Lightbulb

in bimmers, rough idle at start-up usually points to bad gas or sticky injectors.

Get some injector cleaner, put it in your tank when u fill up next time. Injector will clean as you drive.

OR, use chevron gas, mid-grade or better. It already contains the additive to keep your injectors clean.
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#3 (permalink) Old 06-28-2008, 11:33 AM
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I had the same issue some time ago, I took the care to the BMW dealer and the issue was slush within the vanus.
This was caused by the use of the incorrect synthetic oil.
As a result, I no longer replace my oil with the Formula 1 synthetic oil, I now buy the Lubro Moly Voll-Synthese Motor Oil - Synthetic 5 Liters - 5W40, I buy it from Bavauto.com.
It's a German made oil and it really makes a difference.
Here is the description:

Endorsed by BMW! Dramatically decreases engine wear and oil consumption while improving mileage and performance. The 5W40 formula increases protection of your BMW's camshafts, valve-train and engine bearings over standard mineral based oils. Please note: Your Vehicle Requires 6.9 Quarts Or 6.5 Liters.
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