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Posted on Feb 27, 2010
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Hard to start engin ,when engin is warm 2.5 tdi

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Narek Miskarian

Narek Miskarian

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  • Posted on Sep 23, 2012
Narek Miskarian
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Starting hard my audi a4,1.9 tdi avf 130,2002

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Anonymous

  • 79 Answers
  • Posted on May 20, 2009

SOURCE: BMW 320TDI HARD TO START WHEN WARM

Probable Spark plugs have blown. I would do a good tune up and replace your fuel filter, plugs and wires, oil and oil filter, air filter. Your system builds enough fuel pressure when it's cold becuase there is technically less are in your combustion chamber when it's cold so it can build more fuel pressure to start. When it's warm there's less room to build pressure to start your motor. So do a good tune up for now and see if that works. Hope you the best!

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bs77bird

  • 144 Answers
  • Posted on Sep 01, 2009

SOURCE: 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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2000 tdi when cold tick over very lumpy and smokes when warm its ok it starts first time no problem?
Not sure what "tick over" means. Suspect it is hard to start when cold? Could be bad glow plugs. They "warm" the cylinders to get them up to temp before starting. It could also be that you are not waiting for the cylinders to warm up. I have a 2009 tdi. It has a light on the dash that goes on when I put the key in, but I have to wait for it to go out before starting the engine.
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Sep 30, 2016 • 2000 Volkswagen Jetta TDI
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1answer

Starter problems
It's diesel. Diesel engines do not like cold, but that is normal. I am going to assume this engine has a start delay in cold weather to allow for Glow Plugs to warm up the cylinders before actually turning over the engine. I don't know about TDI's specifically, but I think a TDI Mech at your local Volkswagen dealer could confirm my assumption. They may call the parts something different, but the function will be the same. Sounds like normal operation for a diesel engine in cold weather...obviously, this would be why the engine always turns over immediately in warm weather...no need for the Glow Plugs to warm the cylinders. Best of luck resolving this problem.
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Dec 06, 2013 • 2003 Volkswagen Beetle TDI
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1answer

Water is getting into the engine oil in my 07 caddy, it a Tdi. Is it head gasket problams? Not loosing any power but hard to start when cold and smokey till she warms up! Is there anything else it could...
yes your head gaskets are blown
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Jan 18, 2013 • Cars & Trucks
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1answer

My 2002 VW Jetta 1.9 will not shift out of 3rd gear. Any ideas why?
you need to have the codes retrieved out of the computer then start a diagnosis from there

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

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Dec 03, 2012 • 2002 Volkswagen Jetta TDI
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1answer

My 2002 VW Jetta 1.9 will not shift out of 3rd gear. Any ideas why? It also starts from a stop kind of hard.
automatic or standard?

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

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Dec 03, 2012 • 2002 Volkswagen Jetta TDI
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1answer

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.
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Dec 16, 2010 • 2002 Volkswagen Jetta TDI
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1answer

The engine- gt tdi - needs cranking for 2-5 secs to
It is not air or fuel supply. Do not try clearing the fuel lines.

You have a faulty residual fuel sensor. This is part of the warm start system. A small amount of fuel is held under pressure so as there is pressure in the system to start the car. Pressure varies due to heat. Yours is failing under heat. When cold it starts just fine.

Go to the library ask for the Robert Bentley (authors) service manual for your model and yr. If they don't have it they will get it from another branch (free). Look under fuel system and you will see all the details on the system.

It is not hard to check, remove and replace.






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Mar 06, 2010 • Volkswagen Golf Cars & Trucks
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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
Read full answer
Sep 01, 2009 • 2002 Volkswagen Jetta TDI
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1answer

2005 seat altea with 1.9 VW.TDi engine Problem starting : when the engine is HOT. it grinds over for some time before reluctantly starting..then runs perfectly. Starting cold or semi warm is not a problem.
It seems to be usual for this engine to turn over for about 2 -3 seconds when hot but any longer than that you should have it looked at by a technician.
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Aug 25, 2009 • Volkswagen Scirocco Cars & Trucks
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1answer

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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Oct 30, 2008 • 2000 Volkswagen Jetta TDI
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2000 tdi when cold tick over very lumpy and smokes when warm its ok it starts first time no problem?

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