How To Repair Break Vacume Leak On Audi Tt 2002

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• Project Time: one-6 hours
• Tab: $15 to $200
• Talent
• Tools: Pliers, screwdriver, abrupt knife

• Parts Required: New hoses and valves
• Performance Proceeds: Car runs like normal over again
• Complementary Modification: Clean MAF sensor

All mod cars use the vacuum created past the consecration organization and the motor to run diverse systems and components on the vehicle.

The Audi A4 is not different in this regard and uses vacuum to assist in the EGR (exhaust gas recirculation) arrangement too equally the intake organization. The EGR is office of the efforts used to recirculate unburnt gases from the motor dorsum into the combustion sleeping accommodation to exist burnt and result in a cleaner running engine. Vacuum is besides used to control the amount of air entering the combustion sleeping room. This volume of air is carefully metered and the data is used to decide the amount of fuel added to the air and the timing of the spark to decide the maximum part from the engine; this will result in the best possible miles per gasoline while producing the to the lowest degree amount of harmful emissions.

Whatever sort of leak or unmetered air caused by a leaking, cracked or split hose, hose clench or cleaved fitting tin can issue in a poor running engine, failure to pass a SMOG examination or a motor that will non run at all. Don't forget to check places where vacuum leaks may not be equally obvious, such as the oil filler cap and the dipstick.

This commodity will get over the location and fittings of the EGR, EVAP, ventilation and vacuum hoses on the motor. Each hose, fitting and clamp should be inspected. Hoses should be soft and pliable. Any dryness, rips, cracks or bulges in a hose ways it is well past fourth dimension to supercede it.

Hot tip

Utilize caution working with old hoses

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Projection Photos

Figure 1 There are a serial of hoses and valves making up the vacuum and emission systems on the vehicle. The principal areas to check are higher up the intake air cleaner (red pointer), to the right side of the rear of the engine cover (yellow arrow), and to the rear of the intake manifold (green pointer) and the intake manifold itself (blueish arrow).

Figure 2 The area to the rear of the intake air box contains the EVAP valve (red arrow) and lines (yellow arrow). If the EVAP valve is throwing an mistake code, it is all-time to just supersede information technology. The lines should exist checked for condition and replaced as needed. The hose clamps used from the manufacturing plant need a special tool to reuse. Most people just pry the clamp off with a screwdriver and replace the clamp with a standard hose clamp.

Effigy three In front of and below the intake air box is the secondary air pump (red arrow). There are two plastic lines that volition separate when cracked.

Figure four The secondary air pumps intake line connects to the air box (crimson pointer). The output line connects to the combi-valve (yellow pointer).

Effigy 5 At the rear of the engine you will find the combi-valve (blood-red arrow) and a serial of hoses and valves for the EGR system (yellowish arrow). The lines should be checked for status and replaced as needed. The hose clamps used from the factory need a special tool to reuse. Almost people just pry the clench off with a screwdriver and supervene upon the clamp with a standard hose clamp.

Figure 6 The intake manifold has a series of vacuum and EGR hoses attached to it. On the rear is a line that connects to the EGR system. Like most of the hoses, it came from the factory with a clench that is very hard to reuse (cherry arrow). If you are ordering new hoses, you should as well be getting new clamps to be on the safety side.

Figure 7 There is a vacuum line on the right side of the manifold (cerise pointer). This hose has been worked on before and already had the clamp replaced.

Figure 8 While the gasket that seals the crankcase ventilation valve is non as critical as a fuel seal, information technology is always a good thought to replace it (crimson arrow). These gaskets get old and dry up and leak over time.

Figure ix With the intake manifold removed, you can see the crankcase breather hose (blood-red arrow) and the turbocharger recirculating valve (yellow arrow) and the secondary air injector solenoid (green arrow). The lines should be checked for condition and replaced equally needed. The hose clamps used from the factory demand a special tool to reuse. Most people just pry the clamp off with a screwdriver and supervene upon the clamp with a standard hose clench. These hoses and valves are all mounted below the intake manifold and cannot exist serviced without start removing the manifold.

Figure ten While the clamp that seals the crankcase ventilation valve is not as critical as a fuel seal, it is ever a skillful idea to replace it (cerise pointer). This hose gets old and will dry out upward and leak over fourth dimension.

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How To Repair Break Vacume Leak On Audi Tt 2002,

Source: https://www.pelicanparts.com/techarticles/Audi_B6_A4/47-ENGINE-Fixing_Common_Vacuum_Leaks/47-ENGINE-Fixing_Common_Vacuum_Leaks.htm

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