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neo Alfasud
Joined: 14 Mar 2003 Posts: 68 Location: Rijeka, Croatia
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Posted: Tue Oct 31, 2006 7:16 pm Post subject: idle mixture adjustment on 16V |
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Hi!
I've measured the emissions of my engine and I got the following results:
CO=2.37%
O2=1%
CO2=9.5%
HC=330 ppm
The car is a non cat and witouth a lambda probe. Engine code is 307.46. The manual says that there should be 1.5% CO. So i'd like to lower it. I know that I can do that by turning that screw on the MAF. But I don't know witch way to turn to get leaner mixture since I don't have access to the gas analizer anymore.
Thanks! _________________ http://www.quartermile.ws/forum/viewthread.php?tid=889&page=1 |
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stedee Alfa 33
Joined: 02 May 2006 Posts: 364 Location: brighouse
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Posted: Tue Oct 31, 2006 7:23 pm Post subject: |
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check your air filter that can be a cause of high co -i dont like to mess with the original settings because they are right and something else has changed. _________________ brum brum |
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neo Alfasud
Joined: 14 Mar 2003 Posts: 68 Location: Rijeka, Croatia
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bobbber P4
Joined: 14 May 2003 Posts: 2162 Location: The Greatest Town on Earth - Swadlincote, UK
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Posted: Tue Oct 31, 2006 9:18 pm Post subject: |
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Steve is right.
Perhaps getting some abnormal readings from sensors.
Bob _________________ Fiat Bravo 165 Sport |
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neo Alfasud
Joined: 14 Mar 2003 Posts: 68 Location: Rijeka, Croatia
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Posted: Wed Nov 01, 2006 12:35 pm Post subject: |
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I've checked everything. No errors on the ECU, all sensors reading normal. The thing is that this is not the original ecu instalation from my engine. It came from a donor engine. Including all sensors. So I don't even know if the setting on the MAF is factory. _________________ http://www.quartermile.ws/forum/viewthread.php?tid=889&page=1 |
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stedee Alfa 33
Joined: 02 May 2006 Posts: 364 Location: brighouse
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Posted: Wed Nov 01, 2006 2:44 pm Post subject: |
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hmmmmmmmmm i dont know which way to turn it but there are posts on here about adjusting the flap to trick the ecu that more air is coming in than really is maybe you could do the opposite its to do with a `w `spring that controls how much force is needed to open the flap on the maf.i think if you search under tuning you may find it _________________ brum brum |
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johnboy 16 Valve
Joined: 26 Jun 2003 Posts: 1061 Location: margate U.K
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Posted: Wed Nov 01, 2006 9:28 pm Post subject: |
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HI Neo
From memory,to make it leaner.you turn the screw anticlockwise. the oppersite if you had carbs on your car.as this on a carbed car would richen it up.
hope this helps. plus do the airflow mod,it works trust me
regards john _________________ WODA WE NEED? MORE POWER!!
Alfa gt jtdm blackline
1990 S2 16v veloce sleeping!
2002 ts gtv the wifes now
1997 seadoo gsx 800
1999 freestyle superjet |
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BigAl P4
Joined: 06 May 2003 Posts: 2990 Location: U.K Surrey
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Posted: Mon Jan 29, 2007 7:38 pm Post subject: |
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hey neo
I have the correct way to set up the idle mix screw at home somewhere, ill try to fish it it out.
Its something like screw all the way in until engine starts to hunt, then back 1/2 or a full turn.
I have also done the 5 min AFM mod make a mark where it is and move it anti clockwise up to 5 notches, iv done mine 5, some people have done it 3, try it see wotcha think. _________________ x2 33 16v
pictures http://www.alfa-pages.co.uk/viewtopic.php?t=5203 |
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Bellamachinna Alfa 33
Joined: 12 May 2003 Posts: 352 Location: Lisbon-Portugal
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Posted: Tue Jan 30, 2007 1:39 am Post subject: |
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Hi all...
Just for curiosity...
How do you adjust the idle screw on the AFM????????????????????????
Do you get a real change in idle speed?????
I ask this, because, last Saturday, i took my 16v to a specialist, and he disconnected the idle actuator before adjusting the AFM, and then proceeded with the adjusting. After some seconds of ajusting he would blip the throtle (at around 3000rpm), and then restarted the adjustment...
I never used this method, and was used to adjust the idle screw only, without messing with any other ancialiaries. (with little sucess)
The idle was adjusted higher, and after connecting the idle actuator, it would calm down.
He repeted the process till the idle was "silk smooth"
Hope this helps
P.Camilo _________________ All'interno della mia macchina, vi sedete, tenete sopra e CHIUDETE IN SU... |
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