2001 TDI Jetta. To start dealer tells me the only code they pick up from the CEL is a bad glow plug. So I'm at 60k miles and out of warranty with no maintenance costs since brand new, why not, I buy a new set of glow plugs from tdiparts.com and install them. Clear CEL, comes right back within 2 minutes of running idle.
Next I buy a brand new Glow Plug Harness and Glow Plug relay. Reset CEL and still no change, but now I have a rough idle even after driving it for a while. It comes and goes, it could idle great for 5 minutes then rumble and shake at a stop light like its going to die, but runs great on highway. I then replace the MAF with the Piersburg version along with a K and N filter. 3 weeks later of trying to ignore the engine rumble and CEL (I only drive 4 miles to and from work) the Glow Plug light begins to blink. Some days it comes on and some days it doesnt, and it usually doesnt come on until I am out of the driveway and down the street. So I put back in the original plugs and harness with no change, still the only code being thrown is bad glow plug (New Plugs, New glow Plug Harness, New MAF, New Glow Plug Relay, New Fuel Filter, New Air Filter). Only thing left I can find to try is to put back the original code currently upgraded to Upsolute, but that code has run great for 3 years.
Any suggestions?
Next I buy a brand new Glow Plug Harness and Glow Plug relay. Reset CEL and still no change, but now I have a rough idle even after driving it for a while. It comes and goes, it could idle great for 5 minutes then rumble and shake at a stop light like its going to die, but runs great on highway. I then replace the MAF with the Piersburg version along with a K and N filter. 3 weeks later of trying to ignore the engine rumble and CEL (I only drive 4 miles to and from work) the Glow Plug light begins to blink. Some days it comes on and some days it doesnt, and it usually doesnt come on until I am out of the driveway and down the street. So I put back in the original plugs and harness with no change, still the only code being thrown is bad glow plug (New Plugs, New glow Plug Harness, New MAF, New Glow Plug Relay, New Fuel Filter, New Air Filter). Only thing left I can find to try is to put back the original code currently upgraded to Upsolute, but that code has run great for 3 years.
Any suggestions?