Originally Posted By: UG_Passat
Originally Posted By: outoforder
I have a 2003 Jetta TDI @ 294k miles with original nozzles and injectors. Car has been running a bit on the rough side and recent UOAs have been awful. From my research, the nozzles could probably stand to be replaced. Can I get by with just replacing them, or do I need to do the injectors at the same time?
You can just replace the nozzles on your existing injector body. It can be a DIY job.
for the most part, there are 2 stock sizes, one for a manual tranny (.205 microns) and a different one for the automatic (.185 microns)... (drawing from memory)
You can upgrade to a certain point without a tune. Maybe a IQ adjustment if needed.
i think
www.kermatdi.com offers a full replacement with core charge option.
UGPassat has it dead on.
Send each one to Kerma to have the new nozzles installed and pop tested/balanced. While DIY nozzle replacement isn't hard you can't test them until they are back on the engine.
Take the valvecover off and check the cam as well, easy and takes 10 mins. ALH's are not the cam eating monsters a BEW engine can be but as they age the cam can come apart slowly. Usually poor running is the result of that.