207 GTI - what does this 'sensor' do?
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Thread: 207 GTI - what does this 'sensor' do?

  1. #1
    Tadpole
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    Default 207 GTI - what does this 'sensor' do?

    Hi,

    Can anyone tell me exactly what the plug (or sensor) that the red arrow is pointing to actually does?

    In order to put on an induction kit, this plug is effectively unplugged and not re-plugged in. Are there any detrimental effects to doing this?

    Will it throw CEL's or other errors?

    I am guessing it is an air meter of some sort, so will my fuel economy suddenly turn to crap, or is there something else that may happen?

    Thanks in advance.



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  2. #2
    Fellow Frogger! stew's Avatar
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    It is an crankcase breather gas, temperature sensor.

  3. #3
    Tadpole
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    Thanks for that info.

    What are the effects of leaving it unplugged (if any)?

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    1000+ Posts gezza's Avatar
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    No effects don worry about it.



    1990 Renault 5 GT turbo
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  5. #5
    Fellow Frogger! stew's Avatar
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    It helps to trim engine performance if the temp increases enough for the oil vapour to be hot enough to cause pre ignition when it finds it's way past the inlet valves. For some unknown reason leaving it disconnected doesn't seem to bring the check engine light on. One of my theories with that engine is the air filter is so good it starts to cause a low pressure at the breather outlet making a nice vacuum to pull oil vapour into the inlet. Hence the sensor to help trim the engine induction enough to allow for this. I've found the modern air filters air very good but also very small in surface area so they need changing almost every oil change. Just my thoughts. Of course a breather can system would be a much nicer way to go.
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  6. #6
    Tadpole
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    Thanks for your replies. I have bitten the bullet and installed the forge induction - which was much easier than I thought.

    I didn't notice any difference after (not that I expected to), except for one. Under 'hard acceleration', when changing gears, there is now a very audible 'whoosh' whereas before there was no sound. I have a GFB diverter installed also,

    I am actually not sure whether I like it or not.....time will tell.

    Next is a catch can I think..
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  7. #7
    Fellow Frogger! stew's Avatar
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    Yeah, catch can is a fine idea.

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    1000+ Posts gezza's Avatar
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    Cacth can and pcv delete, besides my exhaust you will have dimiliar mods to me then ��



    1990 Renault 5 GT turbo
    ####current rides####
    1994 205 gti 1.9 sorento green
    1988 205 gti 1.9 uk import grey
    2001 clio 172 sport ph1 #44/85
    1998 306 gti6. Blaze yellow
    1992 Honda Fireblade
    2013 Yamaha fzs sho Jetski
    1998 Supra RZ twin turbo white
    1999 Wrx classic gc8 sonic blue



  9. #9
    Tadpole
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    Quote Originally Posted by gezza View Post
    Cacth can and pcv delete, besides my exhaust you will have dimiliar mods to me then ��
    I am a little confused with this. With a pcv delete, why would you need a catch can? I thought the catch can caught the oil residue from the pcv and prevented (some/most of) it from going into the intake?

  10. #10
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    There are two visible outlets from the built-in oil separator. One leads to the front of the turbo, the other to the intake manifold plenum. The separator has valves so that flow is directed to low pressure. Catch cans if fitted intercept vapour in these lines that got past the separator. The most common one used is on the line to the manifold.

    Most crankcase oil drains from the separator down channels cast onto the back wall of the head and block.
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  11. #11
    1000+ Posts gezza's Avatar
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    Pcv delete blank caps 1 goes to the back of the head on the left and the other to at the back on the inlet msnifold.
    Your oil catch can goes from the head on the right and up from your induction kit.

    i was doing this mod way before e tuners put it on there website!! Layer 207/208 gtis have the pcv delete but no catch can.
    vegie likes this.



    1990 Renault 5 GT turbo
    ####current rides####
    1994 205 gti 1.9 sorento green
    1988 205 gti 1.9 uk import grey
    2001 clio 172 sport ph1 #44/85
    1998 306 gti6. Blaze yellow
    1992 Honda Fireblade
    2013 Yamaha fzs sho Jetski
    1998 Supra RZ twin turbo white
    1999 Wrx classic gc8 sonic blue



  12. #12
    Tadpole
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    Thanks seasink and gezza.

    Would you put a catch can on both? I have read some conflicting stories about the pcv delete mod around crankcase pressure and oil leaks and oil usage after the pcv delete has been done.

    Can you still get the blanking caps?

  13. #13
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    Most systems intercept the manifold line. Some do both. The problem is finding room under the bonnet to put the cans. Forge is well known but you may be interested in this approach used mainly on large engines - https://www.mann-hummel.com/fileadmi...nt_en_2013.pdf
    Last edited by seasink; 8th January 2018 at 09:38 AM.

  14. #14
    sans witticism SLC206's Avatar
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    Quote Originally Posted by vegie View Post
    I have read some conflicting stories about the pcv delete mod around crankcase pressure and oil leaks and oil usage after the pcv delete has been done.
    They are there.

    Its not a simple “PCV delete” that PSA have done, despite the blanking caps. The rocker cover-based PCV system has been redesigned a few times.
    Regards,

    Simon

    2014 208 GTi 2011 DS3 DSport
    ----
    2007 207 GTi 2004 206 GTi180 2000 206 GTi 1995 306 XT

    www.peugeotclub.asn.au

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