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« on: 24 August 2010, 16:50:13 »
I have had a fault developing on my Omega 2.2 (2001) over the past few months. The Engine runs on 3 cylinders, occasionally 1 in 20 times I use it runs fine for the first 5 miles or so, then goes back to running on 3 cylinders.
The engine management light has come on and I had the following fault code:
p0110 - generic cylinder 3 missfire
I have replaced the MAF, crank angle sensor, plugs and coil pack to know avail. I have ruled out head gasket too.
I have replaced the cables from the ECU to the back of the coil pack; as a result I now have a connector block at the ECU where the cables come from the pug connecting to the ECU, this has the 8 feeds coming from the ECU, each cylinder has 2 cables from the plug of a smaller gauge to the cables that plug into the back of the coil pack. I assume because there is not enough room in the plug for the full gauge cable and so 2 pins per cylinder used from the ECU. From the connect back of the connect block each cylinder then has 1 cable.
I have identified it is number 1 cylinder that is not sparking. I have also been able to measure the outputs from each of the signal cables coming out from the ECU, by using a volt meter on the connecter block the the battery earth. There is a 13.6 volt signal coming out from cylinder numbers 2,3 and 4, but only 5-6 volts from number 1. I have therefore assumed that the ECU has had it. I bought a replacement, with transponder and chip off ebay for £175 claimed to be off a working car. However, with this I get the exact same fault. The only difference between the ECUs is that thereplacement ECU lights up the engine management light with the spanner on it, where as the original lights up the other light which is just an engine. No codes are now showing?
Does anyone know if this is a common ECU fault in the 2.2 and if so, have I just brought another duff one with the same fault? Any Ideas welcome, the car is heading for the scrap yard at this rate!
Thanks in advance - Dom