Question about 2000 Volkswagen Jetta TDI

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My diagnostic reader says glow plug # 3 cyl faulty which cyl would that be 2005 vw tdi jetta

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You need to replace all of them ,,,if you just replace one the load on the new one will just make them go bad one at a time

Posted on Nov 16, 2009

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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.




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Jan 23, 2011 | 2000 Volkswagen Jetta TDI

1 Answer

VW 2003 Jetta TDI - I am getting a P0674 code, I have been to a couple of sites that seem to indicate that it's a bad glow plug on cylinder 4. Just wondering if anyone can direct me in the right direction....


www.tdiclub.com

Every question you will ever have about your TDi can be answered there.
Nobody knows TDI's better than these guys.

Check out "Glow Plugs 101" - step by step instruction on how to test your plugs on your TDI

http://forums.tdiclub.com/showthread.php?p=749854

Jan 09, 2011 | 2003 Volkswagen Jetta TDI

1 Answer

Where are the three glow plugs that are used for the heater/cooling located on an 02 vw jetta 1.9L tdi?


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_102.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.

Dec 16, 2010 | 2002 Volkswagen Jetta TDI

1 Answer

I have a 2003 VW tdi - the glow plug light is consistently coming on. I have had them replaced several times over the last year. What can I do to fix this problem long term?


Check your relay and wiring bridge. Either could be faulty and throwing a glow plug code. Start by diagnosing the relay since this is the cheaper of the two. Go to the TDIclub.com forums and look up glow plug and you will get an excellent writeup on exactly how to do this.

Nov 12, 2010 | 2003 Volkswagen Jetta TDI

3 Answers

2000 Jetta TDI: How do I change spark plugs on 2000 VW jetta 2.0...


You're in the TDI (diesel) solutions section so it uses glow plugs.
If it's a petrol engine 2.0L then it would be accessible above and below intake manifold using a swivel spark plug deep socket.

May 16, 2010 | 2000 Volkswagen Jetta TDI

1 Answer

The glow plug light on my vw polo has appeared on my car what does this mean? is it ok too drive


The glow plug on the dash indicates various problems with the engine, you need to get diagnostics done as soon as possible as it might become serious.

Apr 12, 2010 | 2000 Volkswagen Jetta TDI

1 Answer

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

Oct 01, 2009 | 2000 Volkswagen Jetta TDI

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

Sep 01, 2009 | 2002 Volkswagen Jetta TDI

1 Answer

2003 vw tdi 1.9


Cyl 4 glow plug circuit intermittent. It basically means you have a bad glow plug or glow plug harness...

Mar 20, 2009 | 2003 Volkswagen Jetta TDI

5 Answers

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.

Jul 16, 2008 | 2002 Volkswagen Jetta TDI

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