Hello Audi lovers, wondering if anyone has some advice to share with me please. I bought a second-hand Audi A3 a couple of months ago and have experienced some misfiring problems. The EMS light was coming on maybe once a week and the car was shuddering and losing power. Got to the stage where it began happening all the time and then the warning light stayed on and car is now undrivable.
The local Audi dealership wanted to replace all the ignition coils without any investigation so I took it to an Audi independent specialist who says they replaced a couple of ignition coils as well as the Injector #2 5 months back. They checked all coils again, the injector and the spark plug and my car is in seemingly perfect mechanical condition. They are still testing it and seem to think it is a computer problem and suggested they may need to replace the computer or have it fixed and they are testing it to see if they can isolate the problem within the computer.
My friend had a similar problem with an Audi and he disonnected the Mass Sensor which seemed to fix the issue. Done a bit of digging around on the web and seems this is a common Audi fault.
Does anyone know about this issue?
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Hiya
>My friend had a similar problem with an Audi and he disonnected the Mass Sensor which seemed to fix the issue. Done a bit of digging around on the web and seems this is a common Audi fault.
make sure you haven't an air leak in any of the pipes on the intake manifold first - before you clean/change the AFM.
I believe with the AFM disconnected the ECU "makes up" the air flow figures from the engine RPM and throttle position - so "may" point to a AFM issue.
A colleague of mine has a similar issue - no EMS lights but it hickups when he pulls off.
James
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thanks for taking the time to reply James,
Is the car still in roadworthy condition if the Mass Sensor is disconnected? Do you know if this a part that can be replaced ? I will ask the mechanic to check for air leaks. would you mind telling me what the AFM is please? I love my Audi and I am trying to learn as much as possible.
kind regards,
Melissa
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Hiya
The airflow sensor can be replaced. The AFM (Air Flow Meter) is used by the ECU to measure the air flow into the engine (air should only go through it, not bypass it in the case of a leak). This is used with other sensor's (o2 sensor, rpm, throttle position, coolant temperature sensor, air temp & presure etc) data to calculate correct fueling.
If your really interested get www.amazon.co.uk/exec/obidos/ASIN/0748780823/ref=o...t and if you want specific's get the Bentley Publishers manual for your car (www.bentleypublishers.com)
James
Edited by Javalin on 03/07/2009 at 12:57
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Hi again James,
just wanted to say thanks again and also let you know your advice was spot on! It was a split air pipe!
cheers,
Melissa
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your very welcome. Which pipe was split?
James
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