Ideal CO level?

[Beddo88]

HI all, just wondered what the ideal CO level is on a pierburg?

Its a 2e2 on a 1.8 scala.

Anyone have any ideas? or even a range it should be within?

[Beddo88]

so after some more trawling of the internet found a recommendation for 1% plus or minus 0.5%. Does that sound about right?

[Junglist]

Out of interest, how did your emissions come out?

CO 4.41 % Volume - Max Limit 4.50

HC 261 ppm - Max limit 1200

Not sure what that all means but i hope it's of some help.

Your hydrocarbons are about the same as mine, your CO is about double what mine was. Interesting to know. Mine's a carb 1.8

His car's a 1.6gti (injection)

My MOT guy said mine would almost pass an emissions test for a catalytic converter car.

Hope that's of some use to you. Oh, mine's on a Weber. I've probably just confused things even more haven't I?

[Beddo88]

That has literally mad things so much more confusing!!

Basically.. get it reasonably low.. think shes running pretty rich atm so just want to lean it off a bit.

[Nate]

CO% Volume - Max Limit 4.50

HC ppm - Max limit 1200

these are the maximum limits for a car of this age to pass the emission part of the mot test. newer cars have stricter limits.

the guideline setting for your particular engine is 1.0% CO at tickover +/- 0.5%

tickover should be 750rpm +/-50

[Junglist]

Thought tickover should be 950. Of all the sciroccos I've had, 750rpm would be an uncomfortably low idle speed. Spluttery and stall-happy.

[Nate]

that's the figures given in autodata

[Junglist]

What's your idle speed? I reckon if I'd dialled mine down on the carb before the MOT, I'd have had a much lower reading, maybe it would have been more like 1% rather than the 2.2% I got.

[Nate]

the mk1 ticks over about 5k, but it hasn't had the new carb fitted yet

[Junglist]

Ha ha. Didn't know you had a mk1. What does yours tick over at, Beddo88?

[Beddo88]

Mine ticks over at about 1100 atm, i adjusted it a while back the idle was set at about 2000 to compensate for others issues with the carb. Having resolved (some) of them now its a bit lower but still a tad spluttery etc. Shall be setting to with the CO tester on monday.

The idle adjust is the 13mm bolt on the back of the 3 point unit isnt it? May well lower it a tad before i check this then.

[ianaudia4]

Just checked my VAG workshop manual, ide speed should be 1100 rpm with the engine temp less that 40 degrees and 950 rpm over 40 degrees, this is plus/minus 50rpm.

[Junglist]

I knew it was 950!

[Beddo88]

So popped mine on the tester... 9% :O

Its back down to around 2% now, but the timing needs sorting and adjusting before i try and sort it out properly. She hardly ever does the annoying 'foot down and stall then start moving' thing anymore which is nice :)

[Rusty dan]

should tell you co level in Strains manual.
Think it is about 1.5% per kg per carbon wotsit lol