my Audi A4 is running Rich at idle

[Hunter]

I replaced MAF, Coils and Spark Plugs = still same shit

1) High Pressure Fuel Pump

2) PCV, I saw wet oil/fuel on one of its corner

3) O2 sensor

Take your pick and Help me guys!! @tuc0

 

[el jorge loco]

It's probably the O2 sensor, especially since you already replaced the MAF.. though I hope it's not Powertrain Control Module

 

[Ghonzo]

Check your O2 Sensor first but have you checked your AFR to see what its reading on idle? If its reading low it might be your PCM dumping fuels. Have you noticed any blue smoke blow by?

 

[A-Rich]

I hadn't heard the term "running Rich." I thought you were talking about me.

 

[tuc0]

@Hunter Seems you're in the right track. If you have an OBDII reader, it may help you diagnose if the O2 sensor(s) are bad. Readers are cheap nowadays. Here's a good read for you.

http://www.obdii.com/articles/Understanding_Oxygen_Sensors.html

 

[Hunter]

Thanks guys!

O2 sensors will be next...Since I saw the leak at the PCV, I have ordered one because I have to fix that leak anyway.

I have a reader and it said my O2 sensors are "OK" on its screen.

 

[Hunter]

Don't buy Audi please

 

[el jorge loco]

Don't buy Audi please

Don't buy European cars in general.

 

[Ghonzo]

Don't buy European cars in general.

Unless you got deep pockets XD

 

[el jorge loco]

Unless you got deep pockets XD

BMW = Big Money Waster; Blow My Wallet