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 Post subject: emissions failure on C02
PostPosted: Fri Nov 21, 2014 3:15 pm 
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Hey!
I recently got my beloved VW Mk3 Golf 1.4L 1996 (N) MOT'd, I was considering scrapping it and buying something else but we've got a lot of history togetherso wanted to keep her going.

Before The MOT I got 2 new tyres, tracking sorted and a whole new exhaust system because the Cat had gone (except manifold) fitted at Wilko Direct. (The cost of the down pipe and cat was only £100 including fitting, I've been told this is very cheap for a CAT, even for a non type approved one and may be the problem?)

I though she would pass easy now, it did on everything except the emissions!

It was passing the HC but failing the C02 giving reading of around 0.600% out of 0.200% and only just failing on the lambda.

Long story short, I've fitted a new lambda sensor, new air filter, new spark plugs, Forte fuel additive thrashed the car about for an hour to clear out the engine and warm her up and still failing on C02 (but only just passing the lambda now, still passing HC)

I went back to Wilko and they checked the exhaust for leaks and took the car to a garage that they use for another emissions test. Same problem again.
They ordered in a new CAT and fitted it incase the old one was faulty, still failing on C02!!!

I've been to a couple of independent garages and they've basically said that I should scrap it, although it's not worth any money I love the car and seems such a shame to scrap her when it runs absolutely fine and passed everything but the C02 emissions...

N.B. the exhaust is emitting a fair amount of white smoke but not at start up, only when the car has been running for a while and warmed up. I've got no loss of oil, no loss of coolant water and no gammy mayonnaise on either caps. I've cleaned the throttle body and the engine seems to be running fine... :dunno:

It's done 107k miles so is getting on but was hoping for at least another year on the road...

Any help would be great!!! Thanks


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PostPosted: Fri Nov 21, 2014 4:26 pm 
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what 1.4 is it ? 8v with rotor arm, dizzy cap and leads ??


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PostPosted: Fri Nov 21, 2014 4:30 pm 
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Hey mate, yeah sorry, 1.4 8valve with distro cap and leads. fuel injection no carb


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PostPosted: Fri Nov 21, 2014 4:38 pm 
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Try some of this stuff
Halfords | Cataclean 475ml
www.halfords.com › ... › Engine Oils & Fluids › Fuel & Oil Additives
Cataclean cleans and maintains your engine's fuel system to perform like new.
I had a Ford Fiesta fail on emissions and stuck a bottle of this in and it passed no problem after a 20 minute run.
It's only 16 quid so it's worth a punt for you.

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PostPosted: Fri Nov 21, 2014 4:56 pm 
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Cheers steve,

I've already tried some Forte fuel additive which I was told was the best there is...
Think it's gone past the additive stage... ::b :dunno:


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PostPosted: Fri Nov 21, 2014 4:59 pm 
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I use the forte diesel treatment on my van,great stuff! It was the guy at the garage that told me to stick the cataclean in the fiesta and it worked a treat. It's not a bank breaker either at 16 quid.

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PostPosted: Fri Nov 21, 2014 5:42 pm 
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My van used to fail and the guy advised me to hammer in third up the motorway for 20 mins and then bring it straight in for testing. It jumped down from 5.2 to 1.6.

You should try this before scrapping it.


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PostPosted: Fri Nov 21, 2014 5:44 pm 
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Cheers Argyll,

I thrashed it about before giving it another emissions test and the same result. maybe not 3rd at 70 though. gotta be worth a shot for sure!


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PostPosted: Fri Nov 21, 2014 6:01 pm 
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Ok,

I've just plugged a little diagnostics VAG reader that I got through the post today and it's coming up with an O2 sensor low voltage reading...

Any ideas what that could entail? shouldn't be the lambda because it's a new one!
Thanks!


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PostPosted: Fri Nov 21, 2014 7:57 pm 
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the pre heat on the lambda may of bitten the dust or there is a wiring fault do you have the P code if any

universal lambda sensors (cheap) tend to fail quickly or don't work at all, tbh use a oem one or NTK item, been there done that and got the blue ray with a 1.4 corsa

iirc the lambda will lean out the mix at low voltage weak mix will bump the Co2 - A rich mix will raise the Hc

but im sure someone will correct me :director:


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PostPosted: Fri Nov 21, 2014 8:02 pm 
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Ok, cheers flash.

I've got the old Lambda so that might give me a different reading, in which case will tell me if it's the lambda or cabling I guess?

Cheers


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PostPosted: Sat Nov 29, 2014 12:59 pm 
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I done a compression test today and the readings are -

Cylinder 1 Cylinder 2 Cylinder 3 Cylinder 4
Dry - 60psi 75psi 70psi 70psi
Wet - 75psi 85psi 75psi 76psi


Any thoughts on these readings?
They don't look too bad to me but cylinder 1 does look a tad low and cylinder 2 a tad high.

Was kinda hoping it was going to give me a sure reading on a head gasket but still puzzled!

The lambda low voltage code has gone for good now by the way...
Thanks!


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PostPosted: Sat Nov 29, 2014 1:46 pm 
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have you done a sniffer test on the coolant ? they all seem low to me iirc it should be around 110 -120 psi +/- 10 psi (depending on the engine code)

do you know what engine code it is, ie. ABU, etc.

iirc the 1.4's of that age like to eat exhaust valves what means a top end rebuild - a car of this age its not worth doing unless its in mint condition suppose you looking at the thick end of £400-500 for valves, seats, guides, lifters and shims plus gaskets and more than likely a cam belt/Water pump


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PostPosted: Thu Dec 11, 2014 7:33 pm 
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any news ? or have you given up ??


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PostPosted: Thu Dec 11, 2014 8:38 pm 
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Just so you guys know,
I replaced the head gasket and valve stem seals, put it all back together and I was buzzing on how well it went, started it up and now runs worse than before!!! I've bought a Mk4 Golf now so the old gal is off to the scrappers soon.

Thanks for the help everyone!
Joe


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