claytski
Veteran Member
Ok, I have had this problem since I got the car. car was had at auction with a bad motor from a blown timing belt. I rebuilt the motor, and the first problem was a code. n109 fuel shut off solenoid. open or short to ground. to start the car I just put a wire to the fuel shut off. started up. just to mention, 109 relay has been replaced. I know there isn't any relation but it is always suggested.
after posting this on here, lots of guys came and suggested things. I went and ohmed out the wires and found the wire from the fuel solenoid was 0.3ohms. it was fine to the 3 pin connector, to the 24 pin connector, to the 62 pin connector, and all the way threw. the thought was the ecu is toast. I picked up a known good ecu today, same part number and everything. the fuel is the same. same fuel curve to it. I have .216 nozzles in the thing. you would think the thing would smoke like crazy without a tune. I can only get it to smoke right when I put the foot to the floor. after that nothing.
so after breaking in the motor, I was able to bring the motor up past 3k rpms and noticed the lack of fuel. after looking at the vag com, I found the injection quantity at idle was 1.8mg/str. it should be 3-9mg/str. I didn't think too much about that until I did a log. my log looks like this for fuel.
I am at a turning place. knee jerk reaction says my quantity adjustor in my pump is toast and I should get another pump or have it rebuilt. however, my brain tells me(some other people that I respect in the tdi world too) that I need to find what the real problem with the n109 wiring is. I am not even close to being electrically saavy. I can read a bently ok, it pains me sometimes. I need some suggestion of where to go from here.
so the questions are:
What tells the ecu to operate this n109 fuel solenoid?
Is the n109 anywhere connected in the ecu circuitry to the fuel quantity?
Where is the grounding point for the ecu? does it get its ground from the chassis by bolting it down or does it have its own ground? I have cleaned all the engine bay grounds
Please dont' suggest the "replace the rubber line in the ecu" statement.
after posting this on here, lots of guys came and suggested things. I went and ohmed out the wires and found the wire from the fuel solenoid was 0.3ohms. it was fine to the 3 pin connector, to the 24 pin connector, to the 62 pin connector, and all the way threw. the thought was the ecu is toast. I picked up a known good ecu today, same part number and everything. the fuel is the same. same fuel curve to it. I have .216 nozzles in the thing. you would think the thing would smoke like crazy without a tune. I can only get it to smoke right when I put the foot to the floor. after that nothing.
so after breaking in the motor, I was able to bring the motor up past 3k rpms and noticed the lack of fuel. after looking at the vag com, I found the injection quantity at idle was 1.8mg/str. it should be 3-9mg/str. I didn't think too much about that until I did a log. my log looks like this for fuel.
I am at a turning place. knee jerk reaction says my quantity adjustor in my pump is toast and I should get another pump or have it rebuilt. however, my brain tells me(some other people that I respect in the tdi world too) that I need to find what the real problem with the n109 wiring is. I am not even close to being electrically saavy. I can read a bently ok, it pains me sometimes. I need some suggestion of where to go from here.
so the questions are:
What tells the ecu to operate this n109 fuel solenoid?
Is the n109 anywhere connected in the ecu circuitry to the fuel quantity?
Where is the grounding point for the ecu? does it get its ground from the chassis by bolting it down or does it have its own ground? I have cleaned all the engine bay grounds
Please dont' suggest the "replace the rubber line in the ecu" statement.