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Thread: Vw golf mk5 2007 1.6 fsi limp mode

  1. #21
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    It's a customers vehicle, I would presume he's using 95 as he doesn't know much about cars, I try to advise but due to the slightly higher price of the fuel people won't listen.

  2. #22
    Verified VCDS User PetrolDave's Avatar
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    Quote Originally Posted by dubTECH View Post
    due to the slightly higher price of the fuel people won't listen.
    Certainly here in the UK that's a false economy. How come?

    Here in the UK 95RON has a higher sulphur content than 98RON fuel, so when you use 95RON fuel the cats have to be de-poisoned more regularly - and that depoisoning cycle decreases the mpg by about 10% (as it needs more fuel to raise the exhaust temperature to remove the sulphur related deposits).

    So with 95RON you get 10% worse mpg than with 98RON - so if 98RON is less than 10% more expensive per gallon/litre then 98RON is actually cheaper in cost per mile/km

    As my maths teacher used to say QED (his version was Quite Easily Done rather than the more formal Quod Erat Demonstrandum).

  3. #23
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    So I got round to this today again, done a few more checks. Replaced the pcv which didn't appear to make a massive difference.
    I checked the readiness codes again as I still suspected the was some form of pressure on the engine, the lambda and catalytic converter blocks were at 0. So I removed the front cat and took it for a test, low and behold we have full power through the rpm and the engine rattle is gone so it looks like I need a cat.
    Strange thing is that there is no faults logged in accordance to any of this, the air intake leak fault is also gone but I'm presuming the was caused by the inoperative pcv.

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  5. #24
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    So today i check spark plugs,coil packs everything looks good, take off throttle body, egr map sensor cleaned properly it wasn't very dirty take off pcv checked looks fine. Put everything back, no fault codes and no difference. I don't know what to do else. At vcds readness catalyst converter shows failed or incomplete.

  6. #25
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    I just run full readness set everything passed except Oxygen sensors failed or incomplete and catalistyc converter failed or incoplete what does it mean? I have to change catalistyc converted?
    Last edited by jaunius; 07-02-2016 at 11:00 AM.

  7. #26
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    I was thinking about to disabled egr valve or blanked maybe it sort out my problem?

  8. #27
    Verified VCDS User Gavra's Avatar
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    For tests to complete you must drive your car. After several driving cycles it will show you valid results.

    Can you please describe exactly how did you checked spark plugs and coils?

  9. #28
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    It was visual inspection my mechanic did that. All parts was boch and its really good condition. Car all the time starts perfect, just when reach operating temperature power reduce down straight away it feels like 1.2 engine is runing.

  10. #29
    Verified VCDS User Gavra's Avatar
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    And his eye is good enough to see difference between 5kV or 11kV spark jump? And how many Amps coil need on hot engine? Burn time duration? Burn time kV? Just one look at ignition waveform is enough to see is engine running lean or rich, is coil strong enough to deal with lean conditions. This information is not available by any scan-tool or visual inspection method. Mechanic must have oscilloscope and be aware how and when to properly use it. I can tell you from 25 years of experience that you need better mechanic......

    If you do not have any good mechanic in your area, install TV and contact me on PM I will check out MVB for free and give you advice where to go next.....
    Last edited by Gavra; 07-03-2016 at 07:43 AM.

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  12. #30
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    Thanks for reply Gavra. Thats good point, but no he doesn't have oscilloscope actually first time I heard about this thing. My spark plugs is http://m.ebay.co.uk/itm/Porsche-Caym...682?nav=SEARCH
    What are you mean install tv? Its like skype and etc?

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