golfdave
Autocross Champion
- Location
- Scotland (U.K.)
- Car(s)
- Mk7 Golf GT Estate
Disclaimer:- This info is for community usage. I am NOT affiliated to, or sponsored by, any company/individual to promote them or their products. Companies/individuals may NOT use my name, photos, or threads/technical guides, for financial or personal gain (fraudulent misrepresentation).
Part 1 of 4
Vehicle used in this guide
UK spec, 2014yr model, Mk7 Golf Estate (GSW), GT (Highline) trim, 1.4lt TSI (140PS) CHPA petrol engine, MQ250 6speed manual gearbox, multilink rear suspension.
Vehicles that this guide is applicable to
All VAG (Audi/Seat/Skoda/VW) cars with the EA211, 4 cylinder, 1.2lt & 1.4lt petrol engines.
Introduction
Some people complain of a “beep” “beep” noise when driving at 50-60kph. Others complain of a faint droning noise. I have heard it faintly over the past 4yrs, & attributed it to a “purge pump” of some kind, basically the engine doing its thing. However, it turns out that the cause is a badly designed part, which acoustically enhances the natural sounds from the operation of the EVAP system!
Research
I first found out about this on the Skoda forum “Briskoda”. There were several threads started by people complaining about this strange noise, which Skoda dealers had attributed to the DSG, or stated “they all do that sir”. However, some owners had found out that the EVAP corrugated pipe which goes from the bulkhead connection near the coolant expansion tank, to the EVAP solenoid (N80), near the front left of the engine, is in fact the culprit. People have removed the pipe & blown through it, & it makes the exact noise they are complaining about. The EVAP system allows the engine to suck petrol vapours/fumes from the petrol tank, through the charcoal filter & into the air intake manifold or turbocharger. So every time the EVAP solenoid (N80) opens the air is sucked through this corrugated pipe, which causes the noise. The corrugations in the pipe cause the acoustic harmonics of the air rushing through the pipe to be amplified more than before!
Apparently VAG changed the part from a corrugated plastic hose to a standard smooth bore rubber hose like the small diameter ones used for the coolant expansion tank. The part on the Briskoda site was 04E 133 518 G, which according to my friendly parts dept., meant nothing. In fact they could find no TPI/TSB for any MK7 Golf for parts in this location regardless of part ID number! All they could find/confirm was that the whole section including the solenoid was part no. 04E 133 366 CT for my car, & that the corrugated section was part no 04E 133 518 E, & that these part numbers have been like that since the MK7 Golf started production!
So after loads more research I found out that the part no. 04E 133 518 E was correct for the new replacement rubber hose section for my car. So, I ordered it, & it turned out to be correct. The other part number 04E 133 518 G, the hose is the same, except that the connector end for the bulkhead end is a 90deg elbow fitting, where as mine is a straight/inline fitting.
Edit 2022:-
There was a TPI released on 1st April 2016, No. 2036393/6 for "Engine: high frequency whistling noise from front end/engine compartment at low engine load in 3rd gear at 50km/h". This is for "The noises are caused by the corrugated pipe of the activated carbon filter in the engine compartment", & involves replacing the existing pipe with a different one. Basically what this "How to guide" is about even though the fault noise is different & this TPI did not show up against my car & VIN number!!
Part 1 of 4
Vehicle used in this guide
UK spec, 2014yr model, Mk7 Golf Estate (GSW), GT (Highline) trim, 1.4lt TSI (140PS) CHPA petrol engine, MQ250 6speed manual gearbox, multilink rear suspension.
Vehicles that this guide is applicable to
All VAG (Audi/Seat/Skoda/VW) cars with the EA211, 4 cylinder, 1.2lt & 1.4lt petrol engines.
Introduction
Some people complain of a “beep” “beep” noise when driving at 50-60kph. Others complain of a faint droning noise. I have heard it faintly over the past 4yrs, & attributed it to a “purge pump” of some kind, basically the engine doing its thing. However, it turns out that the cause is a badly designed part, which acoustically enhances the natural sounds from the operation of the EVAP system!
Research
I first found out about this on the Skoda forum “Briskoda”. There were several threads started by people complaining about this strange noise, which Skoda dealers had attributed to the DSG, or stated “they all do that sir”. However, some owners had found out that the EVAP corrugated pipe which goes from the bulkhead connection near the coolant expansion tank, to the EVAP solenoid (N80), near the front left of the engine, is in fact the culprit. People have removed the pipe & blown through it, & it makes the exact noise they are complaining about. The EVAP system allows the engine to suck petrol vapours/fumes from the petrol tank, through the charcoal filter & into the air intake manifold or turbocharger. So every time the EVAP solenoid (N80) opens the air is sucked through this corrugated pipe, which causes the noise. The corrugations in the pipe cause the acoustic harmonics of the air rushing through the pipe to be amplified more than before!
Apparently VAG changed the part from a corrugated plastic hose to a standard smooth bore rubber hose like the small diameter ones used for the coolant expansion tank. The part on the Briskoda site was 04E 133 518 G, which according to my friendly parts dept., meant nothing. In fact they could find no TPI/TSB for any MK7 Golf for parts in this location regardless of part ID number! All they could find/confirm was that the whole section including the solenoid was part no. 04E 133 366 CT for my car, & that the corrugated section was part no 04E 133 518 E, & that these part numbers have been like that since the MK7 Golf started production!
So after loads more research I found out that the part no. 04E 133 518 E was correct for the new replacement rubber hose section for my car. So, I ordered it, & it turned out to be correct. The other part number 04E 133 518 G, the hose is the same, except that the connector end for the bulkhead end is a 90deg elbow fitting, where as mine is a straight/inline fitting.
Edit 2022:-
There was a TPI released on 1st April 2016, No. 2036393/6 for "Engine: high frequency whistling noise from front end/engine compartment at low engine load in 3rd gear at 50km/h". This is for "The noises are caused by the corrugated pipe of the activated carbon filter in the engine compartment", & involves replacing the existing pipe with a different one. Basically what this "How to guide" is about even though the fault noise is different & this TPI did not show up against my car & VIN number!!
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