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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 11-28-2005, 03:17 AM   #1 (permalink)
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Idle rough and cruise control won't work? help please

95 318is, my cruise doesn't work all the time. and idle rough when I put too much load on DC power(for example when i turned on the head light or rear window defogger, idle will get even worst). So I replaced the alternator and the problems was fixed for six month and it happened again. I replaced another alternator and a new battery, but still can't fix the problems. I checked the error code and got the code 1286 so i changed two of the knock sensors but still cruise doesn't work and idle rough. I checked all the fuses and relays with meter and all looks fine (also i checked the relays below the steering wheel). Finally, I went to dealer try to fix the problems, but they told me my car is fine!!!! WTF. I have been tring to fix my car for a year, and i even took out the DME to solder the board. Please Help
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Old 12-16-2005, 02:46 AM   #2 (permalink)
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I just changed the speedometer sensor and still not helping. what's wrong with my car????
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Old 12-16-2005, 05:02 AM   #3 (permalink)
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Did replacing the alternator and the battery fix the rougher idle when your headlights and defogge are on?

Have you noticed a loss of power? Lower fuel economy?

I seem to remeber similiar symptoms in another thread a while back...
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Old 12-17-2005, 04:32 AM   #4 (permalink)
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Yes, driving at day time idle is ok. But at night when i have the headlights on, idle is very unstable and almost stall. i have to put my right leg on gas panel when i stop. Had the alternator changed two time and the battery is brand new for half year from today. I spent over $1500 now and if i can't fix it within another half year than i sell it.

After all the tune-up, now i'm getting 27mpg. before was around 23mpg.

last week i just received a letter from dmv ask for smoke check. let's see if it can pass it.
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