Air / Fuel Mixture

[theoilburner 7]

Afternoon All,

 

I have been setting my mixture this afternoon and it is running at about 0.2%. Standard 1.9 Gti with a K&N induction kit.

 

I know that this is a healthy figure for a modern CAT equipped car but how healthy is it for these, seems a bit lean to me? Is there anything that I can do to optimise the mixture if this is too lean aside from the obvious?

 

Thanks,

 

Ashley

[Anthony 1,003]

This is a non-CAT model you've got from memory isn't it?

 

If so, it's a on the lean side but if it starts and idles OK and doesn't have a high HC figure then I wouldn't worry too much.

 

There's a recessed allen head bolt (5mm IIRC) on the AFM for adjusting the idle mixture - clockwise to enrichen, anti-clockwise to lean it off.

 

Normally I aim for somewhere around 0.5-1.5% CO when setting them up, tweaking it to wherever it seems happiest.

[theoilburner 7]

Yes it's a non-CAT model. It seemed way too lean to me and I was worried but it does run and idle fine now.

 

HC figure isn't anything to worry about, very healthy actually.

 

I think the issue may be the fact that I have bought a second hand AFM and suspect that it has been messed with to get the car it was originally on through an MOT. Just an inkling that I have.

[theoilburner 7]

What would be a healthy HC reading? If I crank the fuel up any more on the AFM the HC reading goes pretty high (or what I think is high). Could the injectors be the issue? Or the ECU?

 

Any other suggestions?

 

Ashley

[theoilburner 7]

So I am running the wrong injectors and ECU (both 1.6 items), no wonder she's running lean.

 

I can't believe I was stupid enough to overlook something so simple, although at least everything is being renewed / replaced slowly.

 

I will swap these parts and update.

 

Does Mad Proffessor still offer injector cleaning? Has anyone used him recently (most recent thread I could find him mentioned on was 2013).

 

Thanks

[Anthony 1,003]

He's not offering the service currently due to personal issues AFAIK but is/was hoping to be able to offer it again later this year I believe

[theoilburner 7]

He's not offering the service currently due to personal issues AFAIK but is/was hoping to be able to offer it again later this year I believe

 

Thanks for the reply. I have emailed a couple of people to get some prices, £12.50 per injector is pretty good in my book!

[will1991 11 1 Cars]

I used Injectortune recently who appear to have done a good job and came in at £57 including return postage. May be worth a look if you haven't already.

[theoilburner 7]

I used Injectortune recently who appear to have done a good job and came in at £57 including return postage. May be worth a look if you haven't already.

 

Just confirmed my order with them, glad to hear they were good for you.

 

Cheers