Emissions Failure on the GSi

[murph-gsi]

Ok I had the Nova in for the NCT or MOT in the UK. It a 1993 GSi with a CAT Converter. It was in the same time last year and passed on the emissions no problem.

Last years reading was 2.99% but this year it is 9.99%.
The Hydrocarbons last year were 209ppm but this year are 942ppm.

There is also are brake imbalance in the rear of 47%, nearside 1.24kn - offside .660kn. So I guess that is a sticking rear brake hub?

So I need to know what to do to pass it?
Why the emissions were so high as compared to last year?

The car has not been driven much since this time last year. It gets the odd run but that was it, as I was too busy for driving it.

All help and ideas would be much appreciated

[torquey]

It needs a good run to get it nice and warm and clear it out. Maybe try a little service aswell.

[Scottcooper85]

Agreed, if it's been sat and just used for short runs there might be condensation build up in the exhaust.

brake balance might be a knackered wheel cylinder or shoes needs taking up at one side

[meritlover]

try adjusting the handbrake to fix the brake balance.

[Mazz]

Basically need to warm it nice and gently and then hammer the shlt out of it!

[murph-gsi]

Ok so for the emissions I will manage that

So for the rear brakes. The year before at the test they were .830kn offside to .900kn on the nearside. I never left the handbrake on in the garage. So any ideas whats its from or how to get both the same?

[meritlover]

Ok so for the emissions I will manage that

So for the rear brakes. The year before at the test they were .830kn offside to .900kn on the nearside. I never left the handbrake on in the garage. So any ideas whats its from or how to get both the same?

check the adjustment

[meritlover]

While you are at it, check the condition of the rear cylinders, and exercise both front calipers

[murph-gsi]

Dont mean to be stupid but how do I check both of the above?

I know there is an adjuster bolt on the back of the rear hubs but how do I know what is correct?

[Stuart]

The adjuster bolt was used for about 10 cars in the early 80's.... After that, just about all Novas have auto adjusters