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D2 - Engine Bay Everything under the bonnet |
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Engine barely runs (MAF/O2/Relay/Pump) issues
Hello! I am a long time lurker, but only just registered.
This forum has been a great help in helping me diagnose issues with the A8 and felt it was time to actually sign up! I am trying to diagnose a fault with the A8 - basically it cut out one day and wouldn't restart. Got the car recovered and suspecting a dead fuel pump, installed a new unit. After installing the new pump the car ran briefly, idled nicely and even revved up a few times before starting to stumble, barely tick over and then stall. So potential causes - Bad 372 relay? Bad MAF sensor? Dead o2 sensor? - A precat sensor had failed, maybe the other one has gone as well? Is there anything else on the A8 that may cause these issues that I haven't thought about maybe on the ignition side, additional engine control sensors etc? Any insight is appreciated. Regards James |
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