What is this part?

[MantanaB6]

Hey guys,

This part is leaking (what appears to be oil) and I can't figure out what the part is or the part number. It is on top of the passenger side valve cover. My car is suffering from a stumbling idle, and is hard starting, however seems to drive fine once otherwise (no random misfires while accelerating, etc.). I replaced the fuel filter and spark plugs and it didn't resolve the issue. I am probably going to change the coil packs just because I believe they are the originals, and I'm at 130k now, but would like to get any other minor issues fixed first.

[Murder audi]

That is the power steering pressure hose

[ECS Tuning-Audi]

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Jason

[MantanaB6]

Awesome! Thanks guys. That would explain why my power steering turns into a dying whale when the weather is cold. Doesn't fix the idle stutter though... guess I'll change out the coilpacks and see what happens.

[ECS Tuning-Audi]

Stumbling idle could be a vac leak as well. It's usually accompanied by a check engine light in most cases. Do you have any codes?

Jason

[MantanaB6]

No CEL, haven't run the codes (need to find somebody in Calgary with Vag-com). I feel like it is due to a vac leak, especially because of the age/mileage of the vehicle. Should probably just do full vac line replacement while I'm at it. Would a vac leak cause it to hard start though?

[ECS Tuning-Audi]

Not likely a vac leak would cause starting issues. I'd look more into the coolant temp sensor. I know on 1.8T's its pretty common, so I'd imagine it's similar with other engines.

It is only hard to start when the engine is cold?

Jason

[MantanaB6]

Yes it only hard starts when the engine is cold. It also starts fine if I turn the ignition to "on" for a few seconds before starting the engine. That led me to believe it was a fueling issue, hence replacing the fuel filter. I thought it was loosing fuel pressure over time, which could still be the case if maybe the fuel pump is going bad? I hadn't actually thought about the coolant temp sensor...

[ECS Tuning-Audi]

Definitely something worth checking as the coolant temp sensor relays a lot of information in regards to starting such as enrichment and timing. But now that you mention it will start up fine if you key it on and wait a few seconds it might be an issue with fueling. Check the fuel pump relay as well. It should be located under the dash closer to the door. Can you hear the pump prime when you first key the car on for a few seconds?

Jason

[MantanaB6]

I'll have to double check after work if there is an audible sound from the fuel pump priming, I believe there is but can't be sure. It starts no problem everytime after I have the ignition on for a few seconds, and if I am driving it regularly throughout the day it starts without having to "prime" it. I'll check the fuel pump relay, but may be worth just tracking down a new fuel pump and relay to get the fuel system like new again.

[ECS Tuning-Audi]

Sounds good, let us know what you figure out.

Jason