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Author Topic: Erratic idle  (Read 14162 times)

Offline sixpot

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Re: Erratic idle
« Reply #15 on: February 16, 2009, 11:22:34 am »
Update: After unplugging the air mass meter (MAF) the car ran instantly better, with a constant tickover, and no jerkiness coming off part-throttle, so it looks like this could be the problem! quoted £79.41 for a genuine replacement with my discount.
Although I might try cleaning it with carb cleaner spray first and see what happens.
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Offline sixpot

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Re: Erratic idle
« Reply #16 on: February 18, 2009, 05:07:32 pm »
The MAF is pretty much a sealed unit now on these cars, so I wasn't holding out much for cleaning, and sure enough it did not work!
So I've replaced it and the car is running fine now.  8)
Thanks for the offers of a VAG COM scan to everyone that offered.
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Offline bacillus

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Re: Erratic idle
« Reply #17 on: February 18, 2009, 07:34:54 pm »
Glad to hear a bit of good news.   :happy2:
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Offline tony_danza

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Re: Erratic idle
« Reply #18 on: February 18, 2009, 08:16:12 pm »
MAF? Bingo - as someone said they should be replaced as a matter of routine every few years, they cause no end of annoying issues and don't always throw codes to give a hint.

Glad to hear it's cool.
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Offline Norbreck21a

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Re: Erratic idle
« Reply #19 on: February 18, 2009, 08:36:07 pm »
Glad you got it sorted  :happy2:
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Offline john_o

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Re: Erratic idle
« Reply #20 on: February 18, 2009, 08:38:13 pm »
yeah good to hear you got it sorted and reported back  :happy2:
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Offline bacillus

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Re: Erratic idle
« Reply #21 on: February 18, 2009, 09:31:19 pm »
Quote from: tony_danza on February 18, 2009, 08:16:12 pm
MAF? Bingo - as someone said they should be replaced as a matter of routine every few years, they cause no end of annoying issues and don't always throw codes to give a hint.

Glad to hear it's cool.

Checking your fuel trim with vcds could give an indication if your maf is on its way out especially if there's no cel.

http://wiki.ross-tech.com/index.php/Fuel_Trim_Info
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Offline illyun

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Re: Erratic idle
« Reply #22 on: February 23, 2009, 11:33:14 pm »
Interesting... mines booked in at JKM this Friday with the same problem... will let you know how it goes.  The VCDS shows lean fuel at idle ...
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Offline bacillus

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Re: Erratic idle
« Reply #23 on: February 24, 2009, 09:26:35 am »
Quote from: illyun on February 23, 2009, 11:33:14 pm
Interesting... mines booked in at JKM this Friday with the same problem... will let you know how it goes.  The VCDS shows lean fuel at idle ...
You mean you are seeing a positive percentage in the first value?  My value is -0.4%
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Offline illyun

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Re: Erratic idle
« Reply #24 on: February 24, 2009, 12:27:31 pm »
Quote from: bacillus on February 24, 2009, 09:26:35 am
Quote from: illyun on February 23, 2009, 11:33:14 pm
Interesting... mines booked in at JKM this Friday with the same problem... will let you know how it goes.  The VCDS shows lean fuel at idle ...
You mean you are seeing a positive percentage in the first value?  My value is -0.4%

Not sure what you mean as I'm a bit clueless but this is my readout :grin: :grin: :grin:

004506 - Fuel Pressure Sensor (G247): Malfunction
               P119A - 001 - Upper Limit Exceeded
             Freeze Frame:
                    Fault Status: 01100001
                    Fault Priority: 2
                    Fault Frequency: 2
                    Mileage: 44781 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 00:12:18

             Freeze Frame:
                    RPM: 891 /min
                    Load: 14.1 %
                    Speed: 6.0 km/h
                    Temperature: 84.0°C
                    Temperature: 45.0°C
                    Absolute Pres.: 1000.0 mbar
                    Voltage: 13.716 V

001287 - Idle Control System RPM: Higher than Expected.
               P0507 - 001 - Upper Limit Exceeded
             Freeze Frame:
                    Fault Status: 01100001
                    Fault Priority: 2
                    Fault Frequency: 2
                    Mileage: 44781 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 00:18:15

             Freeze Frame:
                    RPM: 964 /min
                    Load: 14.9 %
                    Speed: 0.0 km/h
                    Temperature: 84.0°C
                    Temperature: 13.0°C
                    Absolute Pres.: 1000.0 mbar
                    Voltage: 14.351 V

008583 - Bank 1; System too Lean at Idle
               P2187 - 004 - No Signal/Communication - MIL ON
             Freeze Frame:
                    Fault Status: 11100100
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 44781 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 00:13:03

             Freeze Frame:
                    RPM: 838 /min
                    Load: 14.9 %
                    Speed: 0.0 km/h
                    Temperature: 90.0°C
                    Temperature: 31.0°C
                    Absolute Pres.: 1000.0 mbar
                    Voltage: 13.970 V


Readiness: 0000 0000
Saturday,31,January,2009,03:16:51:01199
VCDS Version: Release 805.2
Data version: 20090111

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Offline bacillus

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Re: Erratic idle
« Reply #25 on: February 24, 2009, 02:45:02 pm »
Ah, I see where you are coming from. Hope you get it sorted.

btw VCDS version 805.3 is available for download.  :smiley:
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