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Author Topic: golf gti mk3 1997 emissons mot  (Read 2603 times)

Offline carl

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golf gti mk3 1997 emissons mot
« on: 18 April 2005, 20:24 »
just had my mot done this evening and it failed on emissions ,now ive just put a k&n induction kit on it about 3 weeks ago does anyone know if it could be because of the new k&n,and should i put my old vw airfilter back on to make this problem go away ,or do i need it tuned ,thanks for your replies carl
« Last Edit: 18 April 2005, 23:39 by carl »
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Offline Overseer

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Re: golf gti mk3 1997 emissons mot
« Reply #1 on: 19 April 2005, 09:21 »

which part of the emissions test did your car fail on?

mine was failing end of last year because i had a vacuum leak causing a high idle.. one was foudn on the brake servo feed and was enough to get it through a retest.. since then have found another one and the car runs great... i'm expecting it to blitz the MOT next time
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Used to have a '97 MK3 16v GTI 3dr in 'Black Magic'... now have a '55 Civic Type-S...

Offline carl

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Re: golf gti mk3 1997 emissons mot
« Reply #2 on: 19 April 2005, 10:39 »
not sure what part it failed on he just said it was running rich ,but now you have said you have had a air leak ive just remembered that there is a funny air leak noise that i here at certain revs so im going to have a look and see if i can spot any air leek thanks
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Offline ipap

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Re: golf gti mk3 1997 emissons mot
« Reply #3 on: 19 April 2005, 11:19 »
You car should run on the lean side with the after market filter, not rich.

I would say you have a vacume leak or dirty air flow meter.

Pop down to your local tuning garage and they will be able to tell you wht's up when they plug it in to the machine and check the emissions.
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Offline AudiA8Quattro

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Re: golf gti mk3 1997 emissons mot
« Reply #4 on: 19 April 2005, 19:02 »
Quote from: ipap on 19 April 2005, 11:19
You car should run on the lean side with the after market filter, not rich.

No it shouldn't, it should run the same.
Thats what an airflow meter is for.
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redcarboy

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Re: golf gti mk3 1997 emissons mot
« Reply #5 on: 19 April 2005, 19:28 »
chuck a bottle of cataclean in that should reduce the emmisions to next to nothing on a 1/4 tank of juice worked for me.. :smiley: :tongue:
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mix

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Re: golf gti mk3 1997 emissons mot
« Reply #6 on: 19 April 2005, 19:38 »
nothing like a bosge eh count??? :grin:
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Offline carl

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Re: golf gti mk3 1997 emissons mot
« Reply #7 on: 19 April 2005, 19:43 »
where do they sell this cataclean ive not seen it about (there again ive not looked)
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redcarboy

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Re: golf gti mk3 1997 emissons mot
« Reply #8 on: 19 April 2005, 19:47 »
Got mine from the local Motorworld shop was £13 a bottle as i remember made by Firestone cant remember wtf they called it now.. :grin: :grin:
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laserblaster

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Re: golf gti mk3 1997 emissons mot
« Reply #9 on: 23 April 2005, 01:27 »
regardless of what airfilter you have it should run perfect!!

and the reason you have the lamda probe.. or oxygen sensor!! this detects your emissions and sets them accordingly!

ie you should never have bad emissions with a car with a cat converter!!

the ecu adjusts the fuel mixture to compensate for rich / lean mixture!! so if your emissions are off there is no screw for adjusting the co level!! basicly the lambda probe is the co adjusting screw! and the ecu is the adjuster!

bad emissions are caused by

dirty injectors
dirty air filter
faulty lambda probe
faulty cat converter

other than that there isnt much you can do about emissions as the ecu sets them for you!

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