Rough idle when AC turned on....

BigDog · 07-19-2011, 11:47 PM

I'm getting quite a rough idle when I turn the AC on high (325i e90)... when I turn the AC down to off, the rough idle improves a bit, but is still there.... (80k miles on the odometer)

Anyone have an idea of what it could be? from the other threads other people seem to have the opposite situation where the rough idle reduces when they turn the AC up higher....

any help would be really appreciated

Mark06 · 07-20-2011, 12:33 AM

I've been having the same problem, noticed it around 65k. I also get very choppy acceleration when Rpms are >4k (so pretty much just at 80% throttle or more). Have you noticed anything similar?

BigDog · 07-20-2011, 12:35 AM

not choppy in that range, but say from 0 - 1200 RPM it is a bit choppy

BigDog · 07-20-2011, 09:54 AM

anyone?

xxxjecxxx · 07-20-2011, 10:29 AM

I had a similar problem. When the AC was on the idle was rough and rpms would surge randomly. I have 80K on car 325i

Changed spark plugs and car now works like new.

Hope that helps

BigDog · 07-20-2011, 06:44 PM

Quote:

Originally Posted by xxxjecxxx

I had a similar problem. When the AC was on the idle was rough and rpms would surge randomly. I have 80K on car 325i

Changed spark plugs and car now works like new.

Hope that helps

appreciate your input

glad its that and not something worse

Mark06 · 07-20-2011, 09:58 PM

Quote:

Originally Posted by xxxjecxxx

I had a similar problem. When the AC was on the idle was rough and rpms would surge randomly. I have 80K on car 325i

Changed spark plugs and car now works like new.

Hope that helps

Do you think this could also explain choppy acceleration in high Rpms?

xxxjecxxx · 07-22-2011, 09:00 AM

It may affect acceleration also.

If acceleration is your problem you may have a PCV leak, which I also had. I had to replace #3 and reconnect #4 because it was loose. After I did that and the spark plugs my car does not have surges when the AC is on and the famous engine ticking actually went away completely.

Good luck!

BigDog · 07-25-2011, 03:13 PM

so it turns out my issue is the vanos solenoid coil...

getting both of them replaced... should be 2-3 hr job tops

ska///235i · 07-25-2011, 11:05 PM

Quote:

Originally Posted by xxxjecxxx

It may affect acceleration also.

If acceleration is your problem you may have a PCV leak, which I also had. I had to replace #3 and reconnect #4 because it was loose. After I did that and the spark plugs my car does not have surges when the AC is on and the famous engine ticking actually went away completely.

Good luck!

any more details to those parts?

jacob.fr7 · 04-21-2019, 12:12 AM

Hey there got an F25 (2011 x3 28i) and an N52N engine under the hood. At 45K miles and the car is having issues with the AC. When on it idles rough

Did an obd 2 test and it shows error code: 80114A0

No results on the web so far, anyone know what it could be? The compressors working just throwing weird idles.

07-19-2011, 11:47 PM	#1
BigDog Major 323 Rep 1,080 Posts Drives: YMB F80 Join Date: Jul 2005 Location: NYC iTrader: (1)	Rough idle when AC turned on.... I'm getting quite a rough idle when I turn the AC on high (325i e90)... when I turn the AC down to off, the rough idle improves a bit, but is still there.... (80k miles on the odometer) Anyone have an idea of what it could be? from the other threads other people seem to have the opposite situation where the rough idle reduces when they turn the AC up higher.... any help would be really appreciated __________________
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07-20-2011, 12:33 AM	#2
Mark06 Private First Class 3 Rep 100 Posts Drives: 330i Join Date: Mar 2011 Location: Texas iTrader: (0)	I've been having the same problem, noticed it around 65k. I also get very choppy acceleration when Rpms are >4k (so pretty much just at 80% throttle or more). Have you noticed anything similar? __________________ "Speed has never killed anyone, suddenly becoming stationary... that's what gets you." -Clarkson
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07-20-2011, 12:35 AM	#3
BigDog Major 323 Rep 1,080 Posts Drives: YMB F80 Join Date: Jul 2005 Location: NYC iTrader: (1)	not choppy in that range, but say from 0 - 1200 RPM it is a bit choppy __________________
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07-20-2011, 09:54 AM	#4
BigDog Major 323 Rep 1,080 Posts Drives: YMB F80 Join Date: Jul 2005 Location: NYC iTrader: (1)	anyone? __________________
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07-20-2011, 10:29 AM	#5
xxxjecxxx Banned 247 Rep 966 Posts Drives: F30 335i M sport Join Date: Aug 2009 Location: Orlando, FL iTrader: (1) Garage List 2013 BMW 335i [0.00] 2006 BMW 325i [0.00]	I had a similar problem. When the AC was on the idle was rough and rpms would surge randomly. I have 80K on car 325i Changed spark plugs and car now works like new. Hope that helps
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07-22-2011, 09:00 AM	#8
xxxjecxxx Banned 247 Rep 966 Posts Drives: F30 335i M sport Join Date: Aug 2009 Location: Orlando, FL iTrader: (1) Garage List 2013 BMW 335i [0.00] 2006 BMW 325i [0.00]	It may affect acceleration also. If acceleration is your problem you may have a PCV leak, which I also had. I had to replace #3 and reconnect #4 because it was loose. After I did that and the spark plugs my car does not have surges when the AC is on and the famous engine ticking actually went away completely. Good luck!
	Appreciate 0 Quote

07-25-2011, 03:13 PM	#9
BigDog Major 323 Rep 1,080 Posts Drives: YMB F80 Join Date: Jul 2005 Location: NYC iTrader: (1)	so it turns out my issue is the vanos solenoid coil... getting both of them replaced... should be 2-3 hr job tops __________________
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04-21-2019, 12:12 AM	#11
jacob.fr7 Enlisted Member 3 Rep 32 Posts Drives: E90 325i / E92 335i Join Date: Aug 2018 Location: Seattle iTrader: (0)	Hey there got an F25 (2011 x3 28i) and an N52N engine under the hood. At 45K miles and the car is having issues with the AC. When on it idles rough Did an obd 2 test and it shows error code: 80114A0 No results on the web so far, anyone know what it could be? The compressors working just throwing weird idles.
	Appreciate 0 Quote