GolfGTIforum.co.uk
Model specific boards => Golf mk3 => Topic started by: devolute on 07 October 2009, 17:46
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I'm failing on emissions.
On a fast idle test I get 0.611% (max 0.300) and a lambda of 1.034 (max 1.030)
This was a re-test. After failing with similar numbers the first time, I was given some liquid to put through the engine. I did this, ran the car round a bit, then bought some of this:
http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_274571_langId_-1_categoryId_165750
..with another tank of fuel. No joy.
The guy at the garage didn't have any suggestions so I turn to you, forum. I have absolutely no idea what the next course of action is.
My Golf has only (!) 85k on it, so I don't want to retire it just yet. The car is in good nick, otherwise.
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Are you running any mods on it?
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Nope. Aside from some rather tacky wheels that the previous owner put on it, it's completely standard to the best of my knowledge.
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Well i would think that its either the cat that is broken, or that its overfueling, which has ruined the cat.
Could be over fueling due to a broken/mis reading sensor.
But im not sure how those engines work tbh.
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Thanks anyway Mikester.
I may take it to my local 'VW specialist' before I break down and take it to my local VW dealership.
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Well i would think that its either the cat that is broken, or that its overfueling, which has ruined the cat.
Could be over fueling due to a broken/mis reading sensor.
But im not sure how those engines work tbh.
+1 sounds like a cat or mixture problem
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Try changing the lambda probe before the cat.
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Try changing the lambda probe before the cat.
And check the wiring i reckon.
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I'd find someone with vagcom and do a scan, might not be the lambda probe at all. Lambda probes ain't cheap so I'd start off with the cheapest stuff first, like a throttle body clean, and air filter renewal.
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Needs a difinitve answer, as mot retests are expensive. Thats the problem.
And does a non gti have fault scanning compatability?
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Thing is it could be the lambda probe, but then again it might not be. So if you replace it then that's the most expensive fix wasted. I could be as cheap and simple as air filter renewal or throttle body clean.
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It recently had a full service, so all the air filters should have been replaced.
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It recently had a full service, so all the air filters should have been replaced.
I would still check.
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try the lamda as the reading looks too high (a new bosch universal one is under £50) and also get a temp sensor (£6 well spent)..
oh and all mk3's are vag-com ready (obd1 if pre 95 and obd2 with "full reading" from mid 95... all e.u sold cars had obd2 from 1995 when euro2 emissions came in to force :wink:)
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Or mabye the engine is fcucked how many miles has it done and does it use (burn) oil?
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It's done about 85k miles. The engine doesn't seem to go through a noticeable amount of oil and for what it's worth, it sounds 'normal' (My pal had a 1.8 Driver - same engine, same sound).
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Replacing the probe is the cheaper fix, otherwise it will be a new cat.
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At the risk of sounding immensely stupid here.. I once had a calibra (cue flaming) and that failed on emmissions. Turned out to be the O2 sensor..
a) is that the sensor everyone is on about
b) does a mk3 even have one of these, I would guess it does in some guise
3) If it does then is it worth considering as it was a very quick and cheap fix
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At the risk of sounding immensely stupid here.. I once had a calibra (cue flaming) and that failed on emmissions. Turned out to be the O2 sensor..
a) is that the sensor everyone is on about
b) does a mk3 even have one of these, I would guess it does in some guise
3) If it does then is it worth considering as it was a very quick and cheap fix
yep same sensor....and it's bolted to the front pipe before the cat