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02-01-2011, 09:12 AM | #1 |
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Rough running in cold weather
Last night I took my fiance out for dinner in the 135i. The temperatures here in Colorado were hovering around -5 degrees with a wind chill in the -10 to -15 degree range. After dinner, I went outside and started the car and noticed it immediately had a very rough idle. The car felt like it was running on 4 or 5 cylinders and had very little power. The check engine light also came on. I drove the car for about 100 feet before I pulled over and turned it off and turned the car back on. The car then ran fine and the CEL was off. Anyone have any thought on what could have caused this? Early signs of my HPFP going out? Something related to the extreme cold? I did a search and didn't come up with anything. The closest BMW dealer is 120 miles away so I would like to get an idea of what might be wrong before I bring it in. Car is completely stock right now.
Thanks in advance, Sean |
02-01-2011, 09:28 AM | #2 |
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I would let the car run a little longer without driving it, once it warms up the cold shouldn't be an issue.
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02-01-2011, 09:39 AM | #3 |
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I cant remember specifics but I remember hearing something about octane levels and altitude and temperature are closely related to a well running car. You live in high altitude relatively.
What octane you using? May have to go up or down in octane to run smoother. Id ask Terry Burger since you have a JB3, hes helped people w/ issues just like this. I remember reading about a guy living in Mexico in the opposite climates as you, he had to do something w/ his tune that Terry helped out with..
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02-01-2011, 09:47 AM | #4 | |
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02-01-2011, 10:09 AM | #5 |
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maybe not an octane thing.
I bet it is your HPFP goin out. Any way for you to check what the CEL code kicked out?
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02-02-2011, 03:47 PM | #7 |
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Sounds like a HPFP failure, the code will be stored in the car for when you bring it in to the dealer. What part of CO are you in?
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02-03-2011, 09:26 PM | #8 |
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Had the very same problem - turned out to be the injectors. They changed all 6 and it has been fine since. Have yours been changed in the recent recall yet?
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02-04-2011, 08:27 PM | #9 |
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I live in Sterling, CO and as far as I know my injectors are stock. I will have them check it out the next time I take the car in for service.
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02-04-2011, 08:50 PM | #10 |
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I had the same problem as soon as I moved to NW IN from SC. After a few weeks and 2 trips to different dealers, HPFP, 2 injectors, spark plugs were changed. Then got new software update. The car was transformed. No problems at all even in 0 degree weather in Chicago. Now I have the JB4 (map 1 due to snow tires) and still running well.
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