Question about 2000 Volkswagen Jetta TDI

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2000 vw tdi. My glow plugs only stay on a couple seconds...

Even when very cold, sometimes the glow plug light only stays on for a couple seconds and the car won't start.  Go through the start cycle again and the same thing happens.  
the next day it might be fine....

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  • hildebrand Jan 06, 2009

    Thanks for the input.  I replaced the temperature sensor in the coolant (real easy) and this seems to have solved the problem of the plugs not staying lit.  I also changed the glow plug relay, but I don't think it was faulty.  It was a lot cheaper to change it ($35) than to have VW diagnose it. ( $50 +).  Now my battery is dying after a full charge sometimes within about 6 hours.  Battery stays charged if I disconnect it from the car once stopped.  I guess there is a current draw somewhere, but haven't tried to find it yet.  Both the battery and the charging system checked out ok.  What can you tell me about the power signal form the main computer.  I haven't checked yet, but I'm not sure the battery really is dead, even though the car shows no signs of power.

  • Anonymous Mar 30, 2014

    GLOW PLUG LAMP STAYS ON FOR A COUPLE OF MINUTES

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I have same problem either glow plug circuit relay or power signal from main computer faulty. Could also be bad wireing harness they are notorious for this. We put a larger battery (higher cca) in to compinsate for excessive cranking a year later were changing the starter it seems summer comes and we blow it off till its noticable again. If you fix exact problem please let me know what it was if possible. GOOD LUCK and Thanks!

Posted on Jan 06, 2009

  • jlpatrizi Jan 07, 2009

    check cooling fans when damp or raining . shut car off and wait they stayed on in my car and kept killing battery I replaced high pressure switch in ac line because as well as the fans on all the time the compressor stayed on and made noise almost like a faulty clutch. The high pressure switch only fixed the problem temporarily. Now its winter not much need for ac and fans only stay on every once in a while.

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1 Answer

Why is glow plug light flashing after boosting in very cold weather?


hi.
in very cold weather, the glow plugs may stay on for up to a minute after starting the car to assist until the engine starts to warm up. the light flashes to tell you that the plugs are still on.
the time the light stays on can vary due to the temperarure.

Feb 26, 2011 | 2000 Volkswagen Jetta TDI

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I have a 2000 Jetta diesel. Can you tell me where the plug for the block heater is? If indeed there is one.


In addition to the 4 primary glow plugs, the cooling system also has 3 Coolant Glow Plugs to help provide extra heat to the cooling system in order to warm-up the vehicle's interior more quickly, and enhance overall engine warm-up time. (Example - Some Mercedes diesel engines use electrical heaters in the cabin because their engine is so thermally efficient.)
Likewise, this auxiliary source of heat from the 3 Coolant Glow Plugs is necessary because of the VW 1.9 TDI engines outstanding efficiency, which wastes very little heat.


The 3 Auxiliary Coolant Glow Plugs are located at the end of the aluminum cylinder head (in a protruding flange) directly below the vacuum (brake booster) pump, which also connects to a coolant hose.

tdisline_180.jpg


The 3 Auxiliary Coolant Glow Plugs use two (underhood) relays which are monitored and controlled by the ECU. During a cold start, the vehicle's interior temperature selector switch helps the ECU choose one of three modes depending on the amount of heat required to warm-up the coolant.

For example, Coolant Glow Plug #1 can be selected to operate all by itself, or #2 and #3 can operate together as a two-some, or lastly, all three glow plugs can form a triple source of heat for maximum enhancement of engine warm-up time.

After the engine is completely warmed up and the thermostat is open, the Coolant Glow Plugs normally shut-off and remain off unless the (thermally efficent) engine cools down sufficiently to have the computer signal them to come back on to keep the engine and cabin air warm. Extensive idling times at stop lights or in the driveway are scenarios where these glow plugs are most likely to recycle on and off.

In conclusion, the period of Preglow and Afterglow is determined by the engine's coolant temperature (during a cold or hot start), which helps the ECU select a predetermined time-cycle for the combustion chamber and / or Auxiliary Coolant Glow Plugs to follow.

Finally, one myth that needs to be immediately debunked, is the belief that the TDI's advanced Glow Plug System is linked to the opening of the driver's side door, which is false! It is also noteworthy to mention that some earlier VW diesel glow plug systems were operated in this manner, but not so with the advanced VW Jetta 1.9 TDI engine.




Please do rate my response. Thanks!

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2002 VW Golf TDI - Live in northern ontario - -20's with wind chill. When I first drove the car this morning - error code (looks like a clock) on upper right portion of speedometer gauge. Just flashes on ...


Classic 109 relay failure.

Relay is for the Glow Plug system.

This relay provides the power to all of a TDI's engine-based electronics.

If the glow plug light comes on intermittently by itself, check your brake lights too.

A burned-out bulb will cause the glow plug indicator light to come on. Sometimes flashing is caused by a bad Brake Lamp Switch on the Brake Pedal. It was updated for free by VW .

If you can see it under the knee panel, the Brake Lamp Switch body should be Metallic Green....if it is Purple or Black it need updated.

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I have a vw bora 1.9 tdi and the heater plug light has started flashing and the car says engine workshop


There are a number of different causes of this problem. Check all glow plugs. Check glow plug relay. If both are ok....This may seem unusual...Check the brake light switch situated at brake pedal. A faulty brake light switch will cause the glow plug light to flash
Good luck with it
John

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1 Answer

02 VW Jetta TDI with ALH engine glow plug


this is a common problem for these cars glow plugs go bad like spark plugs however the smoke would lead to bad mass airflow meter. it is not telling ecu corrcet miss. disconnect mass airflow meter. when cold see if this makes it start better. it should would means you need new m.a.f. glow plug issue take a test light place clamp on positive of battery then pull off glow plug connectors place tip of test light on glow plug the bad one will have a dull light unlike the good one which will be brighter. will need new plugs and wire harness four **** connectors and wire striper and crimper will fix concern good luck

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2 Answers

I have a citroen xantia 2.0 hdi,glow plug light goes out to quickly not on long enough,problem still there even after new glow plugs were fitted, would apreciate help thanks.


have you tried the glow plug relay? or if you have a test light see if theres power to glow plugs when light is on,should only light for 5 or so seconds.some of the newer hdi dont even use the glow plugs till temp is very cold,i have a 2006 2.0 hdi van and glow plug light only stays on for a second or so,and its been like that from new! is the problem just bad starting? and is it only when its cold? if you have a manual priming pump for fuel under bonnet,trying pumping before starting it could be fuel prob?ie air getting into fuel system

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1 Answer

2000 vw jetta tdi glow plug problem ?


Ok , ok. Give me some more information and we'll solve this. We're talking about a jetta TDI 2000 with an ALH engine code I figure.
#1 Do you have an faults recorded in the ECM like a check engine.
#2 Are you using synthetic oil 5W40 preferably Castrol?
#3 How old is your fuel filter?

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02 VW engine light that stays on


You probably need to replace the glow plug harness. The contacts in the boots that connect to the glow plugs get corroded and throw off the resistance of the circuit. The controller in the VW measures whether your glow plugs are good or not by testing the resistance in the circuit. Test all the glow plugs like DickyIV1 stated and if they are all good try cleaning out the crud on the contacts in the glow plug harness. You will then either need to clear the error code or wait several trips for it to clear itself. If it never clears itself or if it comes back on after you clear it then the glow plug harness is too much of a mess. This is really common on the TDIs (mine needs to be changed but i have been putting it off and ignoring the mil light). When I first tried cleaning the harness on my car it didn't give me a problem for another year and a half. But I knew I'd eventually be changing it.
The other thing to keep in mind is that you should change out glow plugs as a set. It causes less problems in the long run since if one failed you will probably find other will soon fail and it keeps all the resistance close to the same value.

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