vw polo genesis 1993 - emissions bit high

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Mon 7 Nov 2011 00:09
vw polo genesis 1993 - emissions bit high - sumsoy

could anyone tell me how to adjust the carburettor on this monomotor tronic polo.

After visiting my usuall mechanic we found the emmisions a bit on the high side, but as this model is usually factory set, my mechanic wasnt sure how to adjust it or what to do to improve the matter.

He cannot run a diagnostic on it as its too old.

On the whole its a great little car and has caused me very lttle trouble.

It has done 123k miles and still whizzes around fine. I would like to keep it as long as poss.

Ideas please!

Edited by sumsoy on 07/11/2011 at 00:10

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Mon 7 Nov 2011 01:09
vw polo genesis 1993 - emissions bit high - brum

If the CO emissions are high this indicates the CAT is probably faulty.

If the LAMBDA readings are out then either the lambda probe is disconnected or faulty.

AFAIK the mixture is controlled by the lambda probe (aka oxygen sensor - located somewhere in the exhaust ahead of the CAT I think) and the engine coolant temperature as measured by a sensor.

1. check you have a clean air filter

2. check the normal running temperature is correct (i.e. thermostat not faulty)

3. check the lambda probe is connected - sometimes they get disconnected when the front downpipe is changed and forget to reconnect.

4. check the temperature sensor is not faulty -change if necessary

5. consider changing the lambda probe if the lambda readings on emmisions are out.

Edited by brum on 07/11/2011 at 01:14

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Mon 7 Nov 2011 08:08
vw polo genesis 1993 - emissions bit high - happy polo

With regard to the Lambda probe, do you have any warning lights illuminated? I don't know whether you'd get one on a '93 Polo, I'd guess maybe not as if I'm right it's essentially just a MK1 underneath? But if you have an engine management-type orange light showing on the dash, the 'check' light, it'll be the probe I'd think. I recently had that on my '51 plate Polo. Cost me £115 for the b****** probe. Ouch :-o

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