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Misfire


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Recently my 2011 a3 8p lost power and engine shaking when on idle. Rac tested it and said it showed misfire on injector 4 and it was loom damage. When it went to the garage they said nothing wrong with the loom and it was injector 4. They replaced number 4 and misfire changed to cylinder 3. We had all 4 injectors sent off and tested. 1 needed calibrating another had a slight blockage. So they sorted them out and when replaced back in the car it still had the misfire. So now the garage is saying they think it's the conrod or bearings. Is this likely? As they have quoted a silly price for for stripping the engine down. This is at a rac approved garage. (Whatever that's meant to mean)

Anybody had this before??

Edited by robert eckersall
Missed info
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