Knocking from drivers side in engine bay - GTI Volkswagen Cars & Trucks

There is nothing in the engine that remains at a constant speed as revs increase. My bet is the climate control system, circulation fan or a blend door actuator. They would be the other side of the firewall whilst you are in the engine bay and the sound is behind the engine.

The other thing you can try is a piece of plastic pipe in your ear and use the other end as a stethoscope.

Hi,
Here is the location of the "Knock Sensor" you requested, I hope it helps you. It is Number 17. for future reference here is the list of the others
1 = Camshaft position sensor (CMP)
2 = Crankshaft position sensor (CKP)
3 = Engine Control relay (EC) -engine bay fusebox/relay plate 1
4 = Engine Coolant temperature sensor (ECT)
5 = Exhaust gas recirculation valve actuator (EGR)
6 = Fuel Filter
7 = Fuel Filter Heater - in fuel filter housing
8 = Fuel Flow control valve - on high pressure fuel pump
9 = Fuel Rail pressure sensor(FRP)
10 = Fuel Temperature sensor - on high pressure fuel pump
11 = Glow Plugs
12 = Glow Plug Relay 1 - engine bay fuse box/relay plate 2
13 = Glow Plug relay 2 - engine bay fuse box/relay plate 2
14 = High Pressure fuel pump
15 = Injectors
16 = Intake air temperature sensor (IAT) - in MAF sensor
17 = Knock Sensor (KS)
18 = Mass Air Flow sensor (MAF)

run the fault codes and look for knock detector problem. The clear fluid at the passenger side of the engine bay may be water from the ac system draining out.

it sounds like the windage tray underneath the engine is loose and needs to be buttoned back up. i recommend looking into it because in the case of a heavy rain, water could enter the engine bay easier and knock off the serpentine belt. and a disrepaired windage tray affects highway gas mileage.

if this is a new shape meriva the problem is the wiper scuttle seal leaking water .it drips into the engine bay,onto the heater pipes and tracs into the cabin.Pour water onto the screen and look into the engine bay,just behind the engine and you will see it drip onto the heater pipes where they enter the bulkhead.It then tracs into the cabin and soaks the carpet.The problem is a foam seal on the scuttle panel when it should be a rubber one.One fix is to ensure that the seal where the heater pipes enter via the engine bay is dry and spray it and the pipes with underseal.Vauxhall are aware but dont have a solution?

Hi,

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Your knock sensor on your 3.8 litre engine is under the hood, passenger side, rear engine area, below exhaust manifold, mounted in engine block.

[I'm not alloted enough space to show you a picture of the knock sensor]




Your EGR valve is located under the hood, center, driver side, mounted on upper center driver side of engine
[I'm not alloted enough space to show you a picture of the GR valve]
All the best,

Ben

If it knocks when you go from Drive to Reverse or Park to Reverse than its usually a rear engine mount, Bushing or bolts to engine cradle under engine near firewall in center of engine bay towards passenger side. This is for a single or tourqe knock Which means the engine rotates too far and makes contact with a part of the engine bay it should not, or it is loose enough to make the sound.

Easier to notice in a stick shift car than a automatic test by setting Ebrake and putting car into reverse go from drive to reverse in idle with foot on brake if its knocking only when you go into gear this is the problem.

If all connections are good "dry, tight, no corrosion" then yes. It should be a defective sensor. These sensors are piezo sensors and create a voltage when sensing a knock. A bank refers to a side on a V style engine, 2 refers to the rear sensor on your bank 2. Bank 1 should be the side with cylinder #1 which should be the cylinder closest to you on one of the sides. So your looking for the rear sensor on the opposite side.

take rubber hose and place near ear use as stethoscope, pin point noise, and pull apart, till problem is located. buy manual

The knock sensor is located Under hood, driver side, upper engine area, driver side of intake manifold, mounted in engine block. Here is a picture of what you are looking for to help you out:
It basically looks like a big nut with an electrical plug-in in the end of it. Please let me know if you have any more questions and remember that this is mounted on the engine block. Thanks for using FixYa!