2001 jetta tdi when you turn the key on the light comes on but the glow plugs dont turn on. Then when the car is running the glow plugs stay and wont shut off and then they eventually burn out. I changed the temp sensor but didn't fix it. The dealer has no idea whats wrong.
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After about every 100Kms one or more glow plugs burn out. Think of them like toaster elements which ignite the fuel on start. The recommended solution is to replace all 4 at once as the labor for changing one is the same as for changing all 4. If you change just 1 (and you would have to be able to figure out which one it is - not easy) the other 3 will follow (failing) in a few weeks afterward.
If you have blue/grey smoke coming out of the tailpipe, you are getting fuel, you can also check to see fuel if you pull back the braided cover on the fuel line (left front side of engine compartment). If you see smoke, check the glow plug relay (180) under the dash.
Your priblem sounds more like the glow plug timer relay than the
exhaust. White smoke after start up is a sign of diesel entering the
exhaust before it has burned completly. This is as a result of the glow
plugs switching off too early, which is usually caused by one or more
faulty glow plugs or a faulty timer.With engine COLD, IGNITION ON...
Check voltage with all 4 plugs connected. You should have a reading of
If there is no power, check in-line fuse on loom coming to plugs.
If power is present, check for How Long. If only for a few seconds, the
problem is with the timer. This unit (the larger of the relays and
usually black in colour) is fitted on the fuse board, and there
are a few different types. They come in 7 pin..8 pin..and even 9 pin
The glow plug light is often NOT accurate (even with a new timer unit
fitted) as to the time of heating, and you will almost certainly find
that power will flow to the plugs for quiet some time after the light
goes out. This is not unusuall with The Jetta Tdi.
I hope this helps you sort out this problem
glow plug relay is marked #180 on the housing.
in 0 to 11 degrees they have a starting prob were the glow plugs go on and off very quickly.need VAG.com to exstend glow plug timing.
to test glow plugs disconeect ect turn key on plugs should draw 15 amps each 60 amps all together.if you dont have amp meter use test light.