Question about Volkswagen Jetta

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I have a jetta 1.8 turbo , and i think the car has a low response when i give it gas. which valve can cause this,? the wastegate or the bypass valve. help me please.

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  • carmonab_21 Apr 21, 2009

    yes its all original, and its all conected, no modifications yet.

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Does it have its origanal turbo?

Posted on Apr 21, 2009

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My 02 Jetta TDI. Check engine comes on & power reduced. Code reads "Turbo overboost." Changed 1) Wastegate actuator & vac hose. 2) MAF sensor. 3) N75 valve and all vac hoses. Same code after each.


what is code when you get the code or if know it online search just code and you will see multi sites for code most of them will tell causes and also how to repair

Jul 28, 2017 | 2002 Volkswagen Jetta TDI

1 Answer

Audi Q7 is showing P0299 eror code what is the problem and how can I solve it?


Faulty wastegate bypass regulator valve
Probable cause:
1. Mechanical damage at turbo/super charger
2. Faulty charge Air pressure sensor

Jul 21, 2017 | Audi Cars & Trucks

1 Answer

2004 jetta 1.8 turbo doesnt seem to be kicking in and the engine doesn't have much power. possible causes?


Have the car scanned for fault codes. A power loss in a turbo motor can be caused by simple vacuum leaks. You can check for loose piping and clamps. There are various components in that car that could cause such a problem. These include the turbocharger itself, the turbo boost (N75) valve, wastegate and its linkage, the car's ECU, maybe even a non turbo fault like a clogged catalytic converter or vehicle misfire.

Aug 01, 2014 | 2004 Volkswagen Jetta

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

2 Answers

Boost(?) problem audi tt


It is probably either the N75 valve(Diverter Valve) or the wastegate actuator. Usually a significant boost leak will set a DTC, still check all hoses and clamps.

A bad wastegate actuator or flap would cause no boost but not necessarily the air-sound.

____________________________________________
Testing N75

Air Bypass Valve: Testing and Inspection
With Generic Scan Tool
Wastegate Bypass Regulator Valve, Checking
Recommended special tools and equipment e.g.:
- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 connector test kit
Test sequence
- Switch ignition off.
- Disconnect connector at solenoid valve for boost pressure regulation.
517f5c6.jpg - Measure resistance between terminals of valve.
Specified value: 25...35 Ohm
If specified value is not obtained:
- Replace Wastegate Bypass Regulator Valve -N75-.

________________________________________________

Testing N249

Exhaust Bypass Valve: Testing and Inspection
With Generic Scan Tool
Recirculating Valve For Turbocharger, Checking
NOTE:
Valve opens between connection to intake manifold and connection to deceleration shut-off valve with no voltage. Connection to vacuum
reservoir is closed.
Test sequence
- Switch ignition off.
- Disconnect connector from Recirculating valve for turbocharger -N249-.

9dfbfb9.jpg - Measure resistance between terminals of valve.
Specified value: 27...30 Ohm
If specified value is not obtained:
- Replace Recirculating valve for turbocharger -N249-.
If specified values are obtained:
- Connect test box to control module wiring harness, connect test box for wiring test.

1a741bd.jpg - Check wire between test box socket 105+2-pin connector terminal 2 for open circuit according to wiring diagram.
Wire resistance: max: 1.5 Ohm
- Also check the wire for short circuit to B+ and Ground (GND).
If no malfunctions are found in wire:
- Check wire between 2-pin connector terminal 1 and the Fuel Pump (FP) Relay -J17- for open circuit according to wiring diagram.
Wire resistance: max: 1.5 Ohm
If no malfunctions are found in wires:
- Replace Engine Control Module (ECM).

____________________________________________


To test the wastegate, locate the wastegate linkage rod and verify that there is no play and that it is closed. You can apply compressed air to the actuator to see if it opens and closes. (not more than 30 psi)

___________________________________________


2bd307e.jpg
Vehicle: Vacuum and Vapor Hose Diagrams
System Diagram
Vacuum Diagram
1 From fuel tank
2 EVAP canister
- with Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-
3 Check-valve for EVAP canister
- Between EVAP canister and intake manifold before turbocharger Installation position (light/dark side): Arrow points in direction of flow, as
shown
4 Turbocharger
5 Pressure unit for boost pressure regulation
6 Mechanical recirculation valve
7 Brake booster
8 Check-valve
- Between brake booster and intake manifold
- Installation position (light/dark side): Arrow points in direction of flow, as shown
9 Wastegate bypass regulator valve -N75-
10 Mass Air Flow (MAF) sensor -G70-
11 Air cleaner housing
12 Pressure control valve for crankshaft housing ventilation
13 Vacuum reservoir
- Bolted on at cylinder head
14 Charge air cooler
- With charge air pressure sensor -G31-
15 Fuel pressure regulator
16 Throttle valve control module -J338-
17 Intake manifold
- With Intake Air Temperature (IAT) sensor -G42-
18 Crankcase ventilation
19 Check-valve
- Installation position (light/dark side): Arrow points in direction of flow, as shown
20 Recirculating valve for turbocharger -N249-
- Component location Fig. 1
21 Check-valve
- Between EVAP canister and intake manifold
- Installation position (light/dark side): Arrow points in direction of flow, as shown
22 Charge air cooler

Oct 01, 2009 | 2004 Audi TT

2 Answers

03 gli there is lag between 2500 and 3200 rpm then seems fine at lower and higher rpms =6 spd


First check for a vacuum leak under the hood.

Inspect ALL of the connections of small vacuum lines as they connect to nipples on parts.

Make sure the vacuum reservoir. A black boxy thing near the firewall does not have a hole in it and that the one way valve connected to it is functioning well.

Jul 29, 2009 | 2003 Volkswagen Jetta TDI

1 Answer

2001 Jetta TDI - Sluggish with black smoke


not usually you would hear a vacuum leak

Jul 24, 2009 | 2000 Volkswagen Jetta TDI

1 Answer

Turbo not working properly, it seems to only go so far then you can hear air rushing out


check the wastegate vacuum diaphragm+hose and wastegate bypass regulator valve and boost pressure recirculation valve.make all hoses is tight.if you losing power remove the turbo check to make sure turbine is turning.if its not spinning fast you will hear air noise.hitting turbine blades.

May 29, 2009 | 2001 Volkswagen Jetta TDI

1 Answer

Wastegate bypass regulator valve


i would say that your turbo is over boosting,variable vain turbos do have this problem with carbon build up,you can take of the variable vain actuator rod and try to work it,if it feels really notchy then you turbo is u/s and not the n75 valve,let me have more details of your car and i will be able to help,if you live in the uk near canterbury i will help you by looking at it

Nov 07, 2008 | 2004 Volkswagen Jetta

1 Answer

Top end power down


Hi,
It sounds like the turbo boost isn't being controlled properly, but this could be due to several things. Check for splits in the air pipework, and then get the N75 valve checked out - this is the item that opens the wastegate on the turbo, effectively shutting the turbo off. Oh, and check that the wastegate actuating lever isn't seized up...
Hope this helps you a bit. D.

Aug 04, 2008 | 2000 Volkswagen Jetta TDI

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