Cosworth CO2 emissions adjustment

peanut_coz · 14-03-2010, 09:30 AM

Hi guys. Took my car for its MOT yesterday, it failed on minor things likes bulbs and wipers etc. But the big thing was the exhaust emmisions were WAY over. I know there is an adjusting screw on the ECU but my question is 'which way do you turn it to turn it down clockwise or anticlockwise?' The car is a near standard 1990 G 2 wheel drive, only engine mod's are stage 1 chip and air filter eliment.
Thanks in advance for your help.

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COCHYN · 14-03-2010, 09:35 AM

You need to get it in the garage to adjust the CO mate, can't do it on the drive.

tabetha · 14-03-2010, 10:18 AM

Unless you have a CO metre, best bet is to have a word with the mot person, if friendly they will be happy to tweak, let you tweak the co, from memory I think it is counter clockwise for leaning, clockwise for richening, but readings on gas metre will soon tell you, don't forget to clear the exhaust every 30 seconds or so, hold at 2500rpm for 20 seconds to do this.
Make sure the fan is not on, esp if you have a cone filter, ingesting hot air will raise the co, but let the fan come on then go off so that you know it is 100% warmed up, if way way off scale maybe fit a new ect sender first ?
tabetha

mattman1234 · 14-03-2010, 08:55 PM

surely,a reasonable mot'er,will adjust there and then,and possibly let you off

botters · 14-03-2010, 08:58 PM

i was wondering this on my own as it seems very high when i checked it , it was showing 7.5%!! its stage 3 tuned should i be turning this down or could it also be a sender problem?

pete mcrash · 14-03-2010, 09:07 PM

ur aloud 3.5%.............but remember to set it back to how it was after m.o.t then i'd go and get it set up properly

bad boy rs · 14-03-2010, 09:42 PM

the co adjuster adjusts fuel throughout the whole range not just idle

peanut_coz · 14-03-2010, 10:26 PM

Yeah i just want to set it for mot then put it back again and get it setup properly. Car been stood for 2 years so gonna service it too which might help. Just took it to test station mainly to see what it needed and if it was too much was gonna break it. Only real thing is the emissions that need sorting, everything else just silly things like wiper and number plate etc.

tabetha · 14-03-2010, 10:41 PM

Although it is affecting the whole range, it acts as a percentage of the idle fuelling, so has less and less effect the more you move away from idle.
Mot rules are getting tighter, no adjustment can be made once mot test has started, but a quiet word I'm sure most would adjust prior to starting the test proper.
The thing about adjusting for mot and then back to where it should be is a excuse for either a shit ecu or mapping job on the chip, or both, ie complete bollocks, should not be needed.
If I can get through on greys, with 180,000+ miles on bottom end no one has an excuse, my co is as it runs normally, ie NO adjustement whatsoever from everyday, at 0.97% CO, but then it's mapped correctly and runs like a dream.
tabetha

botters · 14-03-2010, 10:45 PM

looks like i need a trip to msd then lol! to be fair the cars done 340 mile in 3 years so that probably hasnt helped!

bad boy rs · 14-03-2010, 11:11 PM

thought mine was going to fail on emisions last week, greys 2.5 %, nearly fell over

14-03-2010, 09:35 AM	#2
COCHYN Ginger Welsh Boy Garage is empty, add now Trader Score: (0) Join Date: Jan 2005 Location: North Wales....Macclesfield area now though! Posts: 8,036 Rep Power: 16	You need to get it in the garage to adjust the CO mate, can't do it on the drive. __________________ Focus Cosworth Projecthttp://passionford.com/forum/restora...7-10-09-a.html Focus RS Toyhttp://passionford.com/forum/restora...on-the-go.html

14-03-2010, 08:55 PM	#4
mattman1234 PassionFord Regular Garage is empty, add now Trader Score: (0) Join Date: Aug 2008 Location: kent Posts: 358 Rep Power: 4	surely,a reasonable mot'er,will adjust there and then,and possibly let you off __________________

14-03-2010, 09:07 PM	#6
pete mcrash saff is working!!!...atm Garage is empty, add now Trader Score: (1) Join Date: May 2006 Location: fishburn sex shop...co.durham Posts: 8,978 Rep Power: 14	ur aloud 3.5%.............but remember to set it back to how it was after m.o.t then i'd go and get it set up properly __________________ mapped by Ahmed....set up at Grove....

14-03-2010, 09:42 PM	#7
bad boy rs PassionFord Post Whore!! Garage is empty, add now Trader Score: (7) Join Date: Nov 2006 Location: watFORD Posts: 4,425 Rep Power: 10	the co adjuster adjusts fuel throughout the whole range not just idle __________________ 395 bhp & 410 lb/ft

14-03-2010, 11:11 PM	#11
bad boy rs PassionFord Post Whore!! Garage is empty, add now Trader Score: (7) Join Date: Nov 2006 Location: watFORD Posts: 4,425 Rep Power: 10	thought mine was going to fail on emisions last week, greys 2.5 %, nearly fell over __________________ 395 bhp & 410 lb/ft

14-03-2010, 10:18 AM	#3
tabetha BANNED BANNED Garage is empty, add now Trader Score: (0) Join Date: Jul 2006 Location: uk Posts: 24,646 Rep Power: 0	Unless you have a CO metre, best bet is to have a word with the mot person, if friendly they will be happy to tweak, let you tweak the co, from memory I think it is counter clockwise for leaning, clockwise for richening, but readings on gas metre will soon tell you, don't forget to clear the exhaust every 30 seconds or so, hold at 2500rpm for 20 seconds to do this. Make sure the fan is not on, esp if you have a cone filter, ingesting hot air will raise the co, but let the fan come on then go off so that you know it is 100% warmed up, if way way off scale maybe fit a new ect sender first ? tabetha

14-03-2010, 08:58 PM	#5
botters competant bodger 1989 ford escort My Garage Trader Score: (0) Join Date: May 2009 Location: preston Posts: 3,441 Rep Power: 6	i was wondering this on my own as it seems very high when i checked it , it was showing 7.5%!! its stage 3 tuned should i be turning this down or could it also be a sender problem?

14-03-2010, 10:26 PM	#8
peanut_coz Wahay!! I've lost my Virginity!! Garage is empty, add now Trader Score: (0) Join Date: Nov 2004 Location: notts Posts: 76 Rep Power: 8	Yeah i just want to set it for mot then put it back again and get it setup properly. Car been stood for 2 years so gonna service it too which might help. Just took it to test station mainly to see what it needed and if it was too much was gonna break it. Only real thing is the emissions that need sorting, everything else just silly things like wiper and number plate etc.

14-03-2010, 10:41 PM	#9
tabetha BANNED BANNED Garage is empty, add now Trader Score: (0) Join Date: Jul 2006 Location: uk Posts: 24,646 Rep Power: 0	Although it is affecting the whole range, it acts as a percentage of the idle fuelling, so has less and less effect the more you move away from idle. Mot rules are getting tighter, no adjustment can be made once mot test has started, but a quiet word I'm sure most would adjust prior to starting the test proper. The thing about adjusting for mot and then back to where it should be is a excuse for either a shit ecu or mapping job on the chip, or both, ie complete bollocks, should not be needed. If I can get through on greys, with 180,000+ miles on bottom end no one has an excuse, my co is as it runs normally, ie NO adjustement whatsoever from everyday, at 0.97% CO, but then it's mapped correctly and runs like a dream. tabetha

14-03-2010, 10:45 PM	#10
botters competant bodger 1989 ford escort My Garage Trader Score: (0) Join Date: May 2009 Location: preston Posts: 3,441 Rep Power: 6	looks like i need a trip to msd then lol! to be fair the cars done 340 mile in 3 years so that probably hasnt helped!

14-03-2010, 11:11 PM
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