I have a 2003 jetta tdi, starts hard,smokes, has low power, has code 17656 start of cold start injector control difference. Can anyone help me to find a fix for this car?
Here is a start: check the fuel lines for air, check the injection pump timing (use the timing belt article to find TDC and check the pump timing from there) when was the fuel filter last changed?
Check wiring to injection pump, all battery grounds, or it's an injection pump fault. If it's traced down to a fault N108 off the top of my head it's replaceable but I can't remember if it's replaceable on the car or if you have to remove it.
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