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ok so i had it scanned and came back with a code from a sensor coming from a wire on the glow plug harness. Anyone know what sencor that would be and if it is possible that it is causing the jerking? The code was cleared and didnt come back on till i got back to spruce grove, turned off the car then when i started it came back on
Your TDI has a semi-smart relay for the glow plugs.
It checks the resistance of the glow plugs to inform the ECU when a plug is bad.
A common problem is for the harness that attaches to the plugs to go bad.
From the TDIclub FAQ:
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MIL which comes on after approximately 30 seconds of starting the engine, but which is not associated with any apparent driveability problems but which MAY be associated with difficult cold starting, may indicate a problem related to the glow plug or the glow plug circuit. If you get a "glow plug monitoring" fault upon investigation with VAG-COM, remove the wiring harness from the glow plugs and measure the resistance between each glow plug terminal and the engine block. All four should be the SAME and in the 0.5 to 1.0 ohm range. If you find that one or more glow plugs are either outside this range or are different from the others, consider replacing ALL FOUR glow plugs with new ones. The resistance of the glow plugs must match very closely and since it changes as the plugs get older, one must change all four to ensure that they start out with the same resistance and will all have the same pattern of aging. Also check the main glow plug fuse (it's visible under a small clear plastic cover somewhere in the engine compartment - typically either near the battery or on the firewall). If there are no apparent faults with the fuse or the glow plugs, the most likely problem involves poor electrical connection between the harness and the glow plugs - try sanding / cleaning these contacts or replacing the harness (not expensive). The official service procedure calls for replacing the glow plug relay but it has been found that an exceedingly large majority of the time, the relay is not at fault.
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Ok so it was the 3rd injector sencor as dubsport knows. It was replaced and the car ran awsome. Then i got the alternator done on the car and it did it once. Half way to bc it started doing it really bad and the check engine light back on. A day after letting it sit it was fine again and the check engine light went off. Now it is back on again but running fine. So could it be a short in the harness or is it the sencor again? It was a used injector as it was to test and see if thats what it is.
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