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2004 Audi A4 B6 misfiring

Old 06-05-2015, 02:37 PM
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Default 2004 Audi A4 B6 misfiring

Hello all I have a 2004 A4 B6 1.8 t Quattro. I've been having misfire and rough idle when i start the car. The ESP comes on. When it warms up it goes off and the idle is normal. I've replaced the Plugs,Valve Cover Gasket, MAF,Brake light switch. The codes I'm getting are P0102, P1111, P0234, P0300, P0304, P0302, P1114. I have never had the CEL come on at all. Maybe a vacuum leak or something,O2 Sensor? Any help would be great. Thanx in advance.
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Old 06-06-2015, 05:38 PM
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Default Re: 2004 Audi A4 B6 misfiring

when I started the car today it had another big misfire after only driving a half mile started jerking then stalled. took a few times to start then all was normal. What could be going on?
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Old 06-08-2015, 11:56 AM
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Default Re: 2004 Audi A4 B6 misfiring

Anyone?
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Old 06-08-2015, 02:44 PM
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Default Re: 2004 Audi A4 B6 misfiring

It looks like your main computer. It is located on the drivers side in the battery compartment. Something is not contacting inside it.
To check open the hood, put the key in the ignition and turn without starting the car.
You should hear the secondary fuel pump coming on for 4 seconds and than turning silent. If you don't here it, open the computer box and wiggle the computer plate up and down, without applying too much force. Once you wiggle it you will hear the secondary fuel pump on again. If this happens it is your computer, and you need a new or used one.
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Old 06-08-2015, 03:43 PM
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Default Re: 2004 Audi A4 B6 misfiring

TY for the reply. I'll check that out.
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Old 06-08-2015, 04:38 PM
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Default Re: 2004 Audi A4 B6 misfiring

OK that seems fine. Went I went to start the car the ESP light came on and there is a slight wining gurgling sound when I press the gas. This goes away when the ESP light goes off.
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Old 06-09-2015, 11:29 AM
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Default Re: 2004 Audi A4 B6 misfiring

Has anyone heard this gurgling sound I'm mentioning?
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Old 06-09-2015, 12:06 PM
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Default Re: 2004 Audi A4 B6 misfiring

It could be High Pressure Fuel Pump, trying to catch up with the gas pumping when your computer ECU was not working for a while and than it came on again. If you ever run out of gas the fuel pumps will be making constant noise for the life of the car. This is not dangerous, and they will be doing their job fine. It once again points to the faulty ECU that sometimes is on and sometimes is off. It will get worse with time, and the car will quit on the road, but than when you wait 3 minutes the engine will start again.
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Old 06-09-2015, 01:05 PM
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Default Re: 2004 Audi A4 B6 misfiring

The fuel pump was changed a couple of years ago. Is there a way to test the ECU?
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Old 06-09-2015, 01:07 PM
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Default Re: 2004 Audi A4 B6 misfiring

I looked at the ECU and it has new written on it so it may have been replaced also
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