Page 173 of Volkswagen Parts by PartsPlace Inc.

td i electronics etc air flow meter egr vacuum regulator solenoid valven18 intake manifold most tdi owners are awareor soon will be that tdi s are known to have a problem with the intake manifold and egr valve clogging up with sludge/carbon some customers have reported that the intake ports on their manifolds have gotten blocked up to the point where airflow is restricted to a passage about the diameter of a pencil this doesn t help the engine run better if your tdi doesn t have the power it used to check your manifold we have new manifolds and egr valves available these go bad a lot and seem to be related to carbon/sludge in the intake systemsee also intake manifolds egr valves some people say that running the right oil in your tdi can help reduce the amount of crud that makes it to the intake we have not seen empirical proof of this but it can t hurt if yours goes bad you will probably have a loss of power along with the dreaded check engine light `96 99 tdi all `00 03 tdi all #sn19559 .8995 #sn brand new `96 99.5 #sn18380 .28995 `99.5 02 #sn17844 .32995 wastegate bypass regulator valven75 `98 99 new beetle `99.5 golf/jetta #sn18410 .7995 `00 03 golf/jetta/beetle #sn sold on an exchange basis `96 99.5 w/egr #sn19176 .22995 `99.5 03 #sn17914 .14995 relays are nothing more than heavy-duty switches if your glow plugs are not getting power and the fuse is good it s probably your glow plug relay if you re just driving along and the car craps out like somebody just turned it off it s probably the power supply relaythe 109 relay both go bad more than you would think intake air temperature sensorg72 fits all tdi golf jetta passat and new beetle 1996-2003 #sn18419 .2495 t e or no believis it ot the n this one we ve worst seen glow plug relay `96 97.5 #sn18433 .6995 `97.5 03 #sn16320 .10995 power supply relay `94 03 #sn19206 .1795 intake manifold changeover valven239 golf/jetta/new beetle `99 03 #sn38315 1485 electronic control unit the tdi is the first volkswagen diesel to use electronics to control the injection timing and quantity there is no accelerator cable or cold start cable the computer handles everything if yours goes bad the engine probably won t run at all or very poorly at best to ensure we get you the correct computer get the part number off yours before you call available new rebuilt or used depending on part call egr valve fuel shut-off valven109 it s a good idea to carry one of these as a spare-if it fails it can cut off the fuel supply to the injection pump and the engine will not run easy to replace this also tends to get blocked with crud the assembly includes the egr valve and the antishudder valve which closes off the intake air when the engine is shut off `99.5 03 golf/jetta/beetle tdi all tdi s `96 03 95 #sn4009 .5995 #sn17918 .119 engine speed sensor628 does exactly what the name impliestells the computer the speed of the engine this is important for the engine to run properly `96 98 coolant temperature sensorg62 this is a dual sensor it sends a signal to the ecu and another signal to the guage either half of the sensor can fail without affecting the other `99 `00 02 #sn19376 .9995 #sn17950 .8995 #sn17951 .2995 `96 99.5 #sn16802 2999 `99.5 03 #sn17961 4495 egr cooler `the egr cooler is a heat exchanger that cools the exhaust gases being released back into the intake manifold cooling the recirculated exhaust improves emissions power and fuel economy so if your cooler is plugged up with carbon or leaking coolant replace it immediately note there are many sensors in the tdi models 99.5 03 #sn17943 .27995 and many poor running conditions can be caused by a faulty sensor however like all electrical parts sensors are not returnable so make sure you diagnose the problem correctly before you order p-173

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