Question about 2001 Audi A4
Hello i have a problem with my 2001 audi a4 1.8t quattro ...my engine check light came on flashing and the car run really rough and engine shaking like 1 of the cylinder is misfiring,,,the strange part is sometime it stays on steady and the car runs fine...very strange i had 3 coils change but 1 i havent change yet. could that last coil i havent change causing this problem ,,,i borrow obd2 from friend had code reading a misfire on cylinder #4 ,o2 sensor,ignition module and thermostat sensor ....so which of this is causing the misfire or CEL coming on.. i do not want to go to the dealer to fix .dealer will clean me dry...please i need some advised on what i should do.
I would start with the cylinder 4 spark plug and make sure it look good and is firing correctly. After that I would look either at the final coil, ignition module and then o2 sensor. These problems are so hard to diagnose and are trial and error so much of the time.
Posted on May 19, 2009
I would say it's definately a vacuum leak. That can cause crazy codes to come up because other components on the car will operate improperly due to the leak.
Posted on May 27, 2009
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Posted on Jan 02, 2017
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