Jump to content
  • Welcome to 205GTIDrivers.com!

    Hello dear visitor! Feel free to browse but we invite you to register completely free of charge in order to enjoy the full functionality of the website.

Sign in to follow this  
205*31*

Afm Spring Tension

Recommended Posts

205*31*

Ok been reading up on the afm spring tension and I reckon mine has been fiddled with in past as the flap feels quite loose to me infact I reckon in its current angle in car I bet the flap is slightly open, which if you look at my other threads might account for the mega overfueling I am saying and rough idling.

 

I have read that it can just be a case of a loose spring tension and need tightening is this just a case of tightening the 7mm on the ring retaining gear? if this isn't the case I have also read that if you loosen this nut first marking the original position you can move it clockwise a couple of teeth and put more tension on it, this correct?

 

doesn't really matter if fueling is alittle out as it'll be going back on my mates emissions machine again.

 

cheers.

 

oh its a 1.6 afm :huh:

Share this post


Link to post
Share on other sites
205*31*

anyone with any input? :D

Share this post


Link to post
Share on other sites
205*31*

well since I got no advice I thought sod it and went ahead and modified my afm. I gave it a thorough clean with carb cleaning taking out idle mixture screw I then pryed out the spring with a screwdriver and move the cog wheel 4 teeth to give it more tension put everything back together and fully turned mixture screw in until tight then wound it out about 7 turns.

 

Took all spark plugs out gave them a clean and used a wire brush put them back in, got in car and fired it up and came straight to life revs were high to start with around 2k as engine warmed it started to idle around 1.5k so adjusted brass idle screw got it to settle around 1k. Went for a drive and maybe its me but it definitely feels smoother to drive but doesn't feel as quick low down maybe cause its abit leaner now? doesn't smell as of fuel as bad either when getting out of car after a drive.

 

So maybe this spring tension adjustment has seen a positive side for me time will tell :(

Share this post


Link to post
Share on other sites
Baz

You really won't know whether you've actually done it any good without measuring the CO and HC levels with a wideband lambda or similar.

Share this post


Link to post
Share on other sites
welshpug

what Baz said, and even then it might be ok on idle and fast idle but miles out mid range and top end, hard to tell untill you get it on a RR or out on the road with a wideband lambda.

Share this post


Link to post
Share on other sites
205*31*

well am going to my mates garage tomorrom were going to get it on his emissions machine again to check CO etc... I am sure it'll be either too lean or too rich so adjust as necessary. Its not 100% at the moment I do have plans to hopefully go to SBC and get it tuned properly then it should be 100% :(

Share this post


Link to post
Share on other sites
Baz

And that'll only tell you about idle.

Share this post


Link to post
Share on other sites
205*31*

Ok I been to my mates garage today but he has issues with his electrics wasn't able to put it on emissions machine so i'll be back in morning. I mentioned about getting it hooked up to a wideband lambda but he said how the car doesn't have a lambda sensor. :lol:

Share this post


Link to post
Share on other sites
welshpug

by fitting one!

Share this post


Link to post
Share on other sites
Baz

Or shoving one up the tailpipe...

Share this post


Link to post
Share on other sites
205*31*

so basically you guys are saying drill a hole in exhaust and fit a lambda sensor? then when done bung it up with something <_<

Share this post


Link to post
Share on other sites
floodys

just in response to your first post, i have a mi and i fiddle around with the cog under the square cover, i find that if you say move it a tooth either way it will richen it or make it lean by about 0.3% on the co machine, i have a cheap gunson tester and even though it is cheap it seems to work fine, i say this beacause if i get the car running at say 1.5% co then she drinks the fuel but flys, lean it off with the cog and get it to about 0.5% and she'll do a happy 35-40mpg all day long, i had it set low when coming back from the ring and it was fantasic on juice!!

 

p.s, i think as you tension up the spring it will be richer? thus more suck to pull it open? and also other way round if its slacker then not so much suck!! probably wrong and someone will put me right as normal, but hey!! i knows what works when i do it!!

 

also, in response to tighten spring, the more clicks on the cog you go, the tighter the spring, i dont think you "tighten" any nuts!

Edited by floodys

Share this post


Link to post
Share on other sites
205*31*
just in response to your first post, i have a mi and i fiddle around with the cog under the square cover, i find that if you say move it a tooth either way it will richen it or make it lean by about 0.3% on the co machine, i have a cheap gunson tester and even though it is cheap it seems to work fine, i say this beacause if i get the car running at say 1.5% co then she drinks the fuel but flys, lean it off with the cog and get it to about 0.5% and she'll do a happy 35-40mpg all day long, i had it set low when coming back from the ring and it was fantasic on juice!!

 

p.s, i think as you tension up the spring it will be richer? thus more suck to pull it open? and also other way round if its slacker then not so much suck!! probably wrong and someone will put me right as normal, but hey!! i knows what works when i do it!!

 

also, in response to tighten spring, the more clicks on the cog you go, the tighter the spring, i dont think you "tighten" any nuts!

 

hi floody i thought it would be other way round tighten spring make it leaner mine I don't think now is drinking half as much fuel as before also noticed when starting it doesn't smoke as bad was getting blue smoke doesn't seem to be doing that now so maybe the oil is getting petrol in it?

Share this post


Link to post
Share on other sites
Baz
so basically you guys are saying drill a hole in exhaust and fit a lambda sensor? then when done bung it up with something ;)

 

No! Just shove one that's obviously connected to a gauge etc up the tailpipe and ideally run the car up on a rolling road to see what it's doing. Without running through the rev range you still won't know what it's doing really.

Share this post


Link to post
Share on other sites
205*31*
No! Just shove one that's obviously connected to a gauge etc up the tailpipe and ideally run the car up on a rolling road to see what it's doing. Without running through the rev range you still won't know what it's doing really.

 

your right baz need to find out whats happening throughout the rev range ;)

Share this post


Link to post
Share on other sites
Sign in to follow this  

×