Why might this hose be blanked? - Engine, Tuning and Performance - uk-mkivs

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Why might this hose be blanked?


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#1 jayartibee

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Posted 21 February 2021 - 12:38 PM

Whilst the car was in for new alternator, my indy found this:

 

Why might this hose have been blanked off with a bolt?

 

 

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#2 Gti Fly

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Posted 21 February 2021 - 01:06 PM

All I know is that is the charcoal canister. It's plumbed into the fuel line to deal with fuel vapours

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#3 northpole

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Posted 21 February 2021 - 01:25 PM

maybe the canister has a crack 



#4 ttg4l

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Posted 21 February 2021 - 02:22 PM

That's the pipe going to the intake, so looks like the previous owner might've had issues with the purge valve. If the hose was just left unplugged you'd have a vacuum leak. Means your car is venting fuel vapour to the atmosphere though.

You could potentially connect it back up and see if it causes any adverse effects.

Charcoal canister deletes are sometimes done to remove a potential vacuum leak location, but imo if this was done for that reason then they should've blanked it by the manifold, since you could still have a split on the pipe going to the manifold.

#5 jayartibee

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Posted 23 February 2021 - 10:46 AM

If there was a vacuum leak as a result of reconnecting the canister, what would be the expected outcomes? I imagine the fuel trims would go wonky, and it would give a trouble code? And fail the MOT on emissions?



#6 ttg4l

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Posted 23 February 2021 - 06:38 PM

Probably a lumpy or high idle.

 

You would usually have a stored code for the evap system being faulty.

 

It could go one of two ways, you may also a P0171 system lean code, or a P0172 system rich code if the purge valve is stuck open and you're constantly getting fuel vapour fed into your intake.

 

You can test the purge valve with a couple of test leads and a handheld vacuum pump. Apply vacuum pressure to the end where the pipe connects, the pump should hold vacuum. Then apply 12v to the two pins on the connector and vacuum should drop to 0.

 

Test it a few times and if that checks out then it's likely good.







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