05 Audi A4 Replaced Pcv Code Tripped Again

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• Projection Time: 1-6 hours
• Tab: $fifteen to $200
• Talent
• Tools: Pliers, screwdriver, sharp knife

• Parts Required: New hoses and valves
• Operation Gain: Machine runs like normal over again
• Complementary Modification: Make clean MAF sensor

All modern cars use the vacuum created by the induction system 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 help in the EGR (frazzle gas recirculation) system likewise as the intake system. The EGR is function of the efforts used to recirculate unburnt gases from the motor dorsum into the combustion chamber to be burnt and result in a cleaner running engine. Vacuum is also used to command the amount of air entering the combustion bedchamber. This volume of air is advisedly metered and the data is used to determine the amount of fuel added to the air and the timing of the spark to decide the maximum function from the engine; this volition result in the best possible miles per gasoline while producing the least corporeality of harmful emissions.

Whatever sort of leak or unmetered air acquired past a leaking, cracked or split hose, hose clench or broken fitting can effect in a poor running engine, failure to pass a SMOG exam or a motor that volition non run at all. Don't forget to check places where vacuum leaks may not be every bit obvious, such as the oil filler cap and the dipstick.

This commodity will go over the location and fittings of the EGR, EVAP, ventilation and vacuum hoses on the motor. Each hose, plumbing equipment and clench should be inspected. Hoses should exist soft and pliable. Whatsoever dryness, rips, cracks or bulges in a hose ways it is well past time to replace it.

Hot tip

Use caution working with old hoses

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Project Photos

Figure ane There are a serial of hoses and valves making up the vacuum and emission systems on the vehicle. The main areas to bank check are to a higher place the intake air cleaner (cherry-red arrow), to the right side of the rear of the engine cover (yellow arrow), and to the rear of the intake manifold (green arrow) and the intake manifold itself (blue arrow).

Figure ii 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 error code, information technology is best to just replace it. The lines should be checked for condition and replaced as needed. The hose clamps used from the factory need a special tool to reuse. Most people just pry the clench off with a screwdriver and supervene upon the clench with a standard hose clamp.

Figure three In front of and beneath the intake air box is the secondary air pump (ruddy arrow). There are two plastic lines that will split when cracked.

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

Effigy 5 At the rear of the engine you will discover the combi-valve (red arrow) and a series of hoses and valves for the EGR arrangement (yellow arrow). The lines should exist checked for condition and replaced as needed. The hose clamps used from the factory need a special tool to reuse. Most people just pry the clench off with a screwdriver and replace the clamp with a standard hose clamp.

Figure six 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 arrangement. Like nigh of the hoses, it came from the manufactory with a clamp that is very difficult to reuse (blood-red arrow). If you are ordering new hoses, you should also be getting new clamps to be on the prophylactic side.

Figure 7 There is a vacuum line on the right side of the manifold (red arrow). 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 not as critical every bit a fuel seal, it is always a skillful idea to supervene upon information technology (red arrow). These gaskets become old and dry up and leak over time.

Figure ix With the intake manifold removed, you tin run into the crankcase breather hose (red arrow) and the turbocharger recirculating valve (xanthous arrow) and the secondary air injector solenoid (dark-green arrow). The lines should be checked for condition and replaced every bit needed. The hose clamps used from the factory need a special tool to reuse. About people just pry the clamp off with a screwdriver and replace the clamp with a standard hose clamp. These hoses and valves are all mounted below the intake manifold and cannot be serviced without get-go removing the manifold.

Figure ten While the clench that seals the crankcase ventilation valve is not as critical as a fuel seal, it is always a skillful idea to replace information technology (reddish arrow). This hose gets old and will dry upwardly and leak over time.

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