Question about 2004 Volkswagen Jetta

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No power to coolant glow plugs

Jetta is taking a really long time to get any hot air into the cab. Have tested glowplugs on coolant system no power is getting to them. How can you tell if metal fuse is gone in main fuse box on top of       battery?

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The glow plugs won't come on until the temp is 0 degrees F. the reason you have no heat is the water pump impellor is broken off the inside of the pump. replace the pump and timing belt at the same time. approx 600. to 700. dollars.

Posted on Jan 10, 2009

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1996 ford 250 glow plug fuse keeps blowing


There are not many parts in this system. You have Glowplugs, a timer, and a power relay.

Check the glowplugs. To check you take battery cables and place the fixed connection on the case of the glowplug, avoiding the threads. Then touch the top of the glowplug with the other cable. You can MELT them if you hold the top cable too long.

If you take at least 1 bank of glowplugs out at a time, you can compare them. They should glow equally bright. A dull glowplug is bad. If you do it one cylinder at a time, you will not be able to compare them.

If all check out okay, then it only leaves the timer or the power relay. The timer is a good candidate because it controls how long the pulse will be and that can be what is shorting out the system.

Oct 27, 2013 | 1999 Ford F250 Regular Cab

1 Answer

My 1999 f250 superduty 7.3 starts right up when cold but hard to start after it is warm and surges while driving at 55 mph. it does have a 6 speed ******.


There may be more than 1 problem. The Timer for the Glowplugs adjusts itself for the temperature of the engine and surrounding air temperature. It is suppose to keep the timer going longer for a cold engine than a warm one. But it does need to heat the Glowplugs to atomize the fuel, then compression takes over.

If the Glowplugs have not been inspected lately, it would be a good time to do it. To test, use a jumper cable with care not to damage the threads of the Glowplug. Usually clamp one end of the jumper on the base of the Glowplug and briefly touch the top where the wiring plugs in.

The Glowplug can melt, but you want to see it glow in a short period of time and uniformily with all 8. Any that stay dark are bad, subpar will take longer than you have and will not fully atomize the fuel before they lose power from the timer.

Another problem can be the gating in the Turbo. There should be clean passages for the valving to seal when the Turbo closes. If the Turbo does not close, the exhaust compression may leak into the cylinder too early before a fuel charge is atomized. Since the Glowplugs are barely on for a hot engine, it will complicate starting.

Since your engine starts great when cold, fuel line integrity and the fuel system should not be a problem. Surging at 55mph is probably due to the Turbo.

Check your Vacuum levels at a convenient tap and see if the Vacuum bleeds off quickly or holds pressure for awhile.

Please rate my info and I hope I have been helpful.

Nov 14, 2012 | 1999 Ford F250 Regular Cab

1 Answer

MY 93 FORD 350 7.3 I PUT SWITCH ON AND START CLICKING RIGHT AWAY BEFORE WILL TAKE FEW MINUTES SEEMS LIKE T GLOW PLUG IS NOT WORKING RIGHT IF I PLUG THE ENGINE WILL START WITH NO PROBLEM ,SOME PEOPLE


This is not to hard to solve. The outside airtemp determines how long the Glowplug timer works for absolute cold starts. Starting a warm engine is affected by underhood temps.

The Timer Relay will pulse power to the glowplugs. If the glowplugs are good, it is enough to preheat the cylinder for firing.

To tell if a glowplug is good is a matter of comparision between a new glowplug and a worn glowplug. YOU CAN MELT A GLOWPLUG WITH THIS TEST, but you remove the glowplugs, get a set of battery jumper cables and place one jumper to the base of the glowplug USING CARE not to ruin the threads on the glowplug.

You do not want to arc the spark on the glowplug threads. You want your fixed jumper connector locked on the base of the glowplug. The other battery cable jumper is touched to the top of the glowplug where the arcing occurs. This will not hurt the contact point if done properly.

You compare the "glow" of the old glowplug to the "glow" of the new glowplug. Bad glowplugs stay dark or operate at a darker color.

The Timer Relay gives you pulses and that is all the glowplugs get to heat up. This is what you simulate in your test. If a glowplug operates in a dull or dark condition, it is bad and throw it away. You want all glowplugs to readily light up when power is applied.

The other 2 parts to the system are the Timer Relay and the Power Relay. The timer gets its power from the Power Relay and the Power Relay is like a starter solenoid. The Power relay gets a tickler charge when the keyswitch is held to Start.

There are sometimes extreme cold Timers that hold the power longer tothe glowplugs. I do not have the Specs to tell you if your Timer is kicking out to soon.

I hope my solution helps. I have told you how to test your glowplugs. The timers are affected by air temperature and that makes it difficult to say if it is working long enough. If you know the glowplugs are good, and the timer shuts off before the glowplugs heat up, then you need a new or different type of timer.

Sep 26, 2012 | Cars & Trucks

2 Answers

Tdiclub.com


THE SMOKE YOU HAD IS BECAUSE MANY TRIES TO START COLLECTED FUEL IN THE COMBUSTION CHAMBERS AND SUDDENLY BURNT ON START. ANY WAY THE HESITATION OF CRANK START FOR LONG TIME CHECK WHETHER YOU DO NOT HAVE A PROBLEM WITH THE FUEL PUMP,FUEL FILTER OR COLD START SENSOR. CHECK YOUR SPARK PLUGS CLEAN THE THROTTLE BODY AND DO WITH SCANNER THE ADAPTATION.S

Aug 29, 2012 | 2001 Volkswagen Jetta TDI

1 Answer

The diagram in my haynes manual does not show some parts that are in my 2001 jetta tdi 1.9 turbo. i ran a diognostic and it says glow plug curcuit a malfunction, i changed the plugs and tested the coolant...


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_301.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.

Feb 23, 2011 | Volkswagen Jetta Cars & Trucks

1 Answer

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!

Jan 23, 2011 | 2000 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

On a 1992 ford diesel 7.3 L cold it start run good, but after setting 30 min. you go to start it again and it will not start. If you turn the key on and off about four or five times it will start with a...


It sounds like your Glowplug timer or the Glowplugs are bad. The reason that turning the Key 4 or 5 times helps, is that everytime you put the Key to RUN or START you are energizing the Glowplug timer and reheating the Glowplugs.

You can check the Glowplugs by removing them and remove at least 1 bank at a time. Get some jumper cables and put the NEG post on the plug without smashing the threads. Take the POS cable and touch the Glowplug till it starts to Glow. You can mess up and melt the Glowplug so watch it. BUT, as you test you will find the bad Glowplugs will not light or will take longer to light up.

This is the reason I said to take out 4 plugs at a time, minimum, because you need to compare bad and good, visually.

The timer is not as easy to test. It is a variable timer and the warmer an engine is, the less time it will work. Obviously if the Glowplugs are not Hot, the timer is cutting off too early. But you check your Glowplugs first. The Glowplugs help to give a Feedback loop which tells the timer to stay on.

The rough idle is because the glowplug is not hot or the compression is bad in the cylinder.

Oct 02, 2010 | Ford E-350 Super Duty Cars & Trucks

1 Answer

Nissan vanette not starting from cold


it sounds like there is a short in the glow plug suply circut if they dont work when installed into the engine you might try wiggling the connectors

Dec 01, 2008 | 2002 Nissan Altima

3 Answers

Nissan vanette not starting from cold


My vanette had exactly the same problem yesterday. The glow plugs have a timer and a relay. I think that if the light on the dash goes on and off as normal then its probably the relay not the timer. So I have replaced the relay (£50 nissan dealer only) which is located in the center console below the radio/heater controls. Until its really cold again tomorrow I wont know if its really cured it but I'm fairly certain that will be it.

Oct 21, 2008 | 1990 Nissan Minivan

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