Mot fail for emissions

[johne]

Then only go for your MOT test if the car has been run hard and the coolant temps are up.

That's not going to help, he's got no cats to warm up.

John

[UrS4boy]

Took the s4 for mot today. Bought it last year and only getting it to mot now. Has been parked since 2008. Failed on emissions. CO at idle was 1.990 and HC was 3380. The engine is an AAN with an MTM chip, rs2 exhaust manifold, a stainless steel exhaust without cats and a k&n panel filter in the air box. Where do I start looking to get the numbers down.

Here kitty, kitty. Nice kitty.

That and new plugs and air filter, fresh fuel and an oil change.

Then only go for your MOT test if the car has been run hard and the coolant temps are up.

On a related note before any of the above, you might want to check or replace your G62 ECU coolant temp sender (if bad it will cause the ECU to run the engine rich which would result in at least higher hydrocarbons (especially with no cats) and possibly higher carbon monoxide as well).

G62 info: http://forums.quattroworld.com/s4s6/msgs/20985.phtml

[Rusty]

From memory, without a cat, you should be down around 0.75% CO. SO you're miles off! 3880 HC is pretty terrible too, you'd expect less than 500 on a car running properly.

Pull the codes and see what's up. Sounds like it might be in warmup mode or running the wrong injectors maybe...

[prj]

It's never going to lawfully pass catless.

[chiefmechanic]

Took the s4 for mot today. Bought it last year and only getting it to mot now. Has been parked since 2008. Failed on emissions. CO at idle was 1.990 and HC was 3380. The engine is an AAN with an MTM chip, rs2 exhaust manifold, a stainless steel exhaust without cats and a k&n panel filter in the air box. Where do I start looking to get the numbers down.