Question about 2004 Volkswagen Jetta

1 Answer

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

Turbo problem...dealer replaced valve...not sure wich one?(part # to follow)aprox $130 if that helps...still lacks power

Posted by on

  • Dan Doherty
    Dan Doherty May 11, 2010

    Was it the EGR valve?

  • Johann Smit
    Johann Smit Nov 19, 2017

    One of the thin vacuum pipes must be torn and the minute you go into higher/full boost the ECU doesn't get the requested pressure from the turbo and to protect the tubo from overboosting it puts the car into limp mode, The limp mode only resets when you switch the car off and back on again.

    Trace all the thin 6mm vacuum pipes and you will find your leak.

×

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • Volkswagen Master
  • 3,854 Answers

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.




Posted on Feb 01, 2010

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Oil in spark plug wells


Have a punt around iam sure you can find something in a plumbers shop or make them from a O ring kit

Dec 30, 2013 | Cars & Trucks

1 Answer

No turbo boost


Turbo is broken,remove repair/replace.Warning:turbo compressor stucked/defect may lead to injecting oil into the piston chamber via intake wich can be fatal for engine (lock it ,as oil can not be compressed and bend the piston rods in the worst scenario).Turbo actuator stucked (small piston near turbo)Clean it/replace.Vacuum leak.(loose/worn tubes,clamps)Need visual inspection.

Oct 24, 2013 | Cars & Trucks

2 Answers

AGAIN! STILL NEED HELP ON THIS 2.7 SPRINTER,ALREADY REPLACED THE TURBO BECAUSE I WAS'NT GETTING ANY BOOST, NOW WITH THE NEW TURBO I STILL GOT NO POWER!THE WASTE GATE DOES'NT MOVE AND IF I APLL


THe waste gate is activated by pressure from either the turbo or the oil sustem. If it is physically blocked it wont open. If there is a leak in hoses to the gate it wont open. If the unit is valve operated and the valve sticks, it wont open.

Sep 17, 2012 | Dodge Sprinter Cars & Trucks

3 Answers

Diesel engine problems


Is it a turbo diesel? It sounds like the turbo is shot. Black smoke and runs like **** a pretty sure signs.

Jul 04, 2012 | Renault Cars & Trucks

1 Answer

F350 super duty, after running for an hour wont restart for a couple hours runs fine once you getted started


sounds like ipr valve
located under turbo 2 wire 1 conectorwire clip on
1 3/8 wrench to removed after turbo and air system been pulled off
get your new valve at your local international dealer
ask for ipr valve for vt365 engine bet you it's half price and same part
make sure that screen at end of valve came out with valve use small pick hook to remove if not
good luck

Feb 28, 2011 | 2006 Ford F 350 Super Duty

1 Answer

Turbo fails approximately 3000 rpm when under load (towing a caravan) or overtaking - been advised by VW dealer to pull over and turn off ignition and restart the engine - fine for a while but it recurred...


I haad the samo problem and solved it by replaceing one off two vacum pumps wich regulate the EGR valve... Solenoid, you can take it off and test if it's working properly.

Jul 07, 2010 | 2001 Volkswagen Golf

1 Answer

VOLVO 850 RADIO/CD REPLACEMENT


Yes, its simply to remove the radio wich is there (two clamps, one on each side) retract the connectors.
You might need to buy a compartment to conceal the part of the opening that will be exposed when removing the bigfront-radio.
(Volvo-dealers can help you) And a cableset wich contains the connectors to the Radio-connectors in the 850 and directly to the radio you buy. (Most radio-dealers hava all kinds)

New radio mounts in only e few hours. All included.
Theese Volvos are very well prepeared for this.

Jun 30, 2009 | 1995 Volvo 850

1 Answer

Low power after timing belt replaced


Providing what the dealer said is true then you can disconnect your positive battery cable for 30 minutes. (PLEASE MAKE SURE THAT YOU HAVE YOUR RADIO CODE BEFORE YOU DO THIS) and the computer will lose all its old memory and this should fix your problem. Good Luck

Dec 20, 2008 | 2000 Volkswagen Passat 4Motion

2 Answers

Surging Turbo


I had the same trouble, my problem was a leaking turbo valve and it was expensive to replace at the dealer$

Jul 02, 2008 | 2002 Volkswagen Beetle Turbo S

Not finding what you are looking for?
2004 Volkswagen Jetta Logo

1,779 people viewed this question

Ask a Question

Usually answered in minutes!

Top Volkswagen Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers

yadayada
yadayada

Level 3 Expert

76846 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8557 Answers

Are you a Volkswagen Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...