Question about 2003 Volkswagen Jetta TDI

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2003 Jetta TDI Turns but does not start

Checked the fuel line and changed fuel filter, not the battery or air shut off valve, connection to fuel shut off solenoid, or fueses. Turns but does not start.

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If it starts when pulled by other vehicle then Glow Plugs. othervise check the Ignition Key Contacts, might be worn out.

I neither of those then give me some more information. What exactly engine it is, maybe u know engine code.

when you checked the fuel line fuel flowed when u tried to start the engine while the fuel line was disconnected from intake? have you checked the injectors? are they spraying fine or there's no command.

Posted on Jun 22, 2009

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Posted on Jan 02, 2017

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1 Answer

Fuel shut off valve


Reconnect the battery = reset power.

Nov 24, 2013 | 2001 Volkswagen Jetta TDI

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Engine turns over on my 2003 Jetta 1.9L TDI but does not start. New battery , all lights are working. Changed fuel fillter and put diesel in it to wet it, but still does not start. It did start once and...


When were the glow plugs last changed?

They sit over the cylinder like spark plugs and warm the diesel before it goes into the inlet manifold, greatly assists starting.

May 17, 2010 | 2003 Volkswagen Jetta TDI

1 Answer

Engine turns over will not start


I will fist need to know if engine just died,this happened over night it ran out of fuel? it it ran out of fuel you will need to prime the fuel system of air witch may include loosening the fuel injector lines and cranking engine over then when engine starts to fire tighten lines and continue to try until it starts it will run rough and smoke white and then it will clear and be back to normal. it can also be a bad lift/fuel pump or a cracked or broken line,bad injection pump many things just need more info message me if any more questions thanks and good luck

Apr 28, 2010 | 2003 Volkswagen Jetta TDI

1 Answer

Turbo problem...dealer replaced valve...still


If you have a problem that isn't caused by something obvious, you need a Ross tech VCDS cable. This is a laptop computer diagnostic cable to talk to the car's computer. Without it you cannot do the more advanced tests.
Note about generations - some generations have similar engines: Mk3= 1996-1997 3rd generation Passat TDI or 1996-1999 3rd gen Jetta TDI Mk4= 1998-2006 New Beetle, 1999-2005 Jetta, 1999-2006 Golf, 2004-2005 Passat TDI Mk5= 2005.5-2010 Jetta TDI Mk6= 2010+ Golf TDI
Remember, an engine needs fuel, air, and compression to run. Low power is related to a lack of one of these or a sensor problem making the computer thinking there's a lack of these. Any sensor problem could also be caused by a bad ground or broken/chaffed wire so also check every section of the wiring of the suspect sensor for breaks.
Bad MAF sensor - very likely cause on the mk4 TDI. Not common on the mk3 TDI (1996-1999 Jetta/Passat). Early mk4 MAFs failed often.Error codes normally do not show up with a faulty MAF since the signal degrades instead of going out completely. Through VCDS, checking MAF actual vs. specified at idle, high rpm, and high load will quickly show a bad MAF or other problem causing a low MAF reading.
Clogged intake manifold - carbon buildup chokes the intake manifold, starving the engine of air. Only ultra low sulfur diesel is sold in North America now so there should be much less buildup in the future. Always use good quality synthetic engine oil on your TDI..
Anti shudder valve shut or almost shut (does not apply to mk3 TDI, more for mk4 TDI) - there is a spring loaded valve right before the intake manifold. Newer TDI use an electronic valve and are not as susceptible to sticking. If there is excess carbon buildup, it could shut in a partially closed position.
Clogged snowscreen/air filter - a clogged air filter will starve the engine of air. A clogged snowscreen (large debris air pre-filter) shouldn't block off all air unless the aux-intake flap is also clogged.
Clogged fuel filter - change interval is 20,000 miles but biodiesel use (cleans out old buildup) or bad fuel could clog it early, resulting in fuel starvation. Algae or bacterial growth in the fuel tank could also clog the lines.
Boost leak - a cracked hose or loose connector lets measured air out. No air or major leaks = poor engine running or stuttering. A visual inspection may not reveal all the possible or hard to see spots where leaks can form.
Hose inside ECU (mk3 TDI only, does not apply to mk4 or newer TDI) - this hose leaks and normally sets a check engine light,
Vacuum lines to/from turbo and n75 solenoid - these dry out over time and crack or can rub through. It's possible they are clogged. The n75 solenoid controls the turbo wastegate or VNT vanes with either vacuum or pressure. b4 Passat - on firewall above coolant reservoir, a3 Jetta - on pass side near air box, a4 Jetta/Golf - on firewall above brake fluid reservoir.
Problem with the n75 solenoid, VNT actuator, VNT vanes, or vacuum lines. You should have already checked the vacuum lines, the below test will inspect the entire system. Start the engine and through VCDS, click on "engine"-->"measuring blocks"-->hit "up" until you reach "group 11". Compare Specified vs. Actual MAP. This compares what's actually happening and being observed from the boost sensor (barring a faulty sensor/plug/wire) to boost the computer is requesting (what should be happening). They should be relatively close. If they are far off this normally results in limp mode but it could also be contributing to the problem. If you have a mk3 you have a conventional turbo but you can still use this test to check the n75 solenoid, the wastegate, and vac lines. However, wastegates are much less susceptible to sticking vs. VNT vanes. The videos below show how it works. The lever on the outside is welded to a lever inside the turbo housing. This is how it moves the VNT vanes. See the below videos to see how smoothly and free the lever should move. It should not stick or bind at all. Vacuum is being applied to the can, not pressure.
If the test shows poor response or no response at all, it could be sticky VNT vanes/actuator (mk4 and newer TDI only), The vanes or actuator can stick or fail to function, the lever should move freely.
If the actuator is fine, also check the n75 solenoid and vac lines. The n75 solenoid controls vacuum or boost to the vacuum line going to the turbo wastegate/VNT actuator. To test, apply voltage to the solenoid or swap with a known good unit. If you have a mk4 TDI, you can swap it with the EGR solenoid to test. Also check the plug for corrosion and the wiring harness for chaffing. If those are good, disconnect the VNT actuator rod and move the vanes by hand. If the vanes are stuck then remove the turbo and clean the inside of the exhaust housing to free the stuck vanes.
Faulty injection pump's fuel injection quantity adjuster - these are occasionally set wrong from the factory or after seal replacement. It's also possible the fuel pump's internal quantity adjuster is faulty. Applies to 1996-2003 TDI only or TDI that use a Bosch VE injection pump (not pumpe duse or common rail). Injection quantity should be 3-5 at idle and up to 36-38 at full throttle.




Feb 01, 2010 | 2004 Volkswagen Jetta

1 Answer

My volkswagon 2003 jetta tdi doesn't have any power when you hit foot pedal going up a hill it doesn't have power to make it


check air filter. good chance it is clogged also the shut off valve could have serious carbon build up both of these items are easy to look at. also unplug the Mass air flow meter if power returns or is better good chance it will be that. which will have been killed by a clogged air filter.

Sep 04, 2009 | 2003 Volkswagen Jetta TDI

1 Answer

03 jetta tdi won't start turns over fast won't kick ,cracked open injectors it's getting fuel,also put a clear tube on fuel line and it is sucking in fuel


Ck. anti shake shut off butterfly valve(vacuum actuated) at intake manifold, sometimes they stick. I'm assuming all the glow plugs are working?

Jul 06, 2009 | 2003 Volkswagen Jetta TDI

2 Answers

2002 VW Jetta died while driving it.


Either you threw a belt or the alternator went bad. Your symptoms sound like alternator...you were running on the battery till you ran out of power.

Feb 20, 2009 | 2003 Volkswagen Jetta TDI

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2001 Jetta Diesel - engine starts then stops right away


it sounds like the stop/start solenoid on the diesel pumps faulty, which bentley manual are you after model and engine size please

Jan 10, 2009 | 2001 Volkswagen Jetta TDI

1 Answer

2003 Jetta TDI deisel fuel filter change


Fill the filter with ATF, if no diesel fuel is handy. The T section with double o rings and a hair clip was removed, pour ATF in the resultant hole until it was full. Remove the clear line from the filter to the pump by disconnecting it at the filter. With a thin tube fill the line with ATF fluid until no bubbles remained. Reconnect the clear line to the filter. The car should start immediately.

Sep 16, 2008 | 2003 Volkswagen Jetta TDI

2 Answers

2003 vw jetta tdi fuel filter


It is on the passenger side right behind the washer fluid fill tube. You can follow the fuel lines (look like 1/4" black tubes, some are clear) from the injector pump to it. It is a caniser a bit bigger than a normal looking oil filter and sits between the washer bottle and the metal that forms the wheel well. It is held in by a screw type clamp about half way down the cylinder. Probably isn't the fuel filter unless there is air in the lines to the injector pump or they didn't bother to fill the fuel filter up with diesel after putting it in. There is not a fuel pump in the tank in these cars so everything is sucked up by the injector pump and it needs to be primed properly.

Jun 25, 2008 | 2003 Volkswagen Jetta TDI

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