quick CO question
#1
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what should i set the CO to? on an exhaust analyser.
saff 4x4 dk greens stg3
i need to know what to set it to at idle, turned it down for the mot, as have idle problems.
also should i check it at another engine speed??
in theory if the engine is fully warmed, it shouldnt matter whether the iscv is plugged in. and does the throttle adjustment screw affect CO?
cheers guys
R
saff 4x4 dk greens stg3
i need to know what to set it to at idle, turned it down for the mot, as have idle problems.
also should i check it at another engine speed??
in theory if the engine is fully warmed, it shouldnt matter whether the iscv is plugged in. and does the throttle adjustment screw affect CO?
cheers guys
R
#4
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Originally Posted by JTECHSAFF
yeah its a global fuel adjuster not just a idle co trim
when up to temp the iscv should have no effect on idle speed as it should be shut.
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when up to temp the iscv should have no effect on idle speed as it should be shut.
#5
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Originally Posted by rs nutter
Originally Posted by JTECHSAFF
yeah its a global fuel adjuster not just a idle co trim
when up to temp the iscv should have no effect on idle speed as it should be shut.
![Sad](https://passionford.com/forum/images/smilies/icon_sad.gif)
when up to temp the iscv should have no effect on idle speed as it should be shut.
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
#6
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Originally Posted by rs nutter
Originally Posted by JTECHSAFF
yeah its a global fuel adjuster not just a idle co trim
when up to temp the iscv should have no effect on idle speed as it should be shut.
![Sad](https://passionford.com/forum/images/smilies/icon_sad.gif)
when up to temp the iscv should have no effect on idle speed as it should be shut.
the fuelling over the entire map as on the ECU itself
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#8
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Originally Posted by bud-weis
Afraid not pal, it adjusts the lot ![Sad](https://passionford.com/forum/images/smilies/icon_sad.gif)
![Sad](https://passionford.com/forum/images/smilies/icon_sad.gif)
and by that theory, if you have the 'correct' fuelling at idle, you will have the correct fuelling over the whole rev range
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Originally Posted by bud-weis
Originally Posted by rs nutter
Originally Posted by JTECHSAFF
yeah its a global fuel adjuster not just a idle co trim
when up to temp the iscv should have no effect on idle speed as it should be shut.
![Sad](https://passionford.com/forum/images/smilies/icon_sad.gif)
when up to temp the iscv should have no effect on idle speed as it should be shut.
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
#10
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Originally Posted by gingeRS
Originally Posted by bud-weis
Afraid not pal, it adjusts the lot ![Sad](https://passionford.com/forum/images/smilies/icon_sad.gif)
![Sad](https://passionford.com/forum/images/smilies/icon_sad.gif)
and by that theory, if you have the 'correct' fuelling at idle, you will have the correct fuelling over the whole rev range
![Grin](https://passionford.com/forum/images/smilies/icon_smile.gif)
#11
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The screw is what we call a global modifier in as much as it adds a percentage to the entire fuel map.
If your engine is just borderline safe on boost, leaning the CO can and will destroy teh engine when flat out. The correct base position is in teh region of 5 turns clockwise and 2 turns anticlockwise to put you back in teh ballpark, but this is of course dependant on MANY MANY factors such as heads, cams, sensors, fuel pressure etc etc...
If your engine is just borderline safe on boost, leaning the CO can and will destroy teh engine when flat out. The correct base position is in teh region of 5 turns clockwise and 2 turns anticlockwise to put you back in teh ballpark, but this is of course dependant on MANY MANY factors such as heads, cams, sensors, fuel pressure etc etc...
#12
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Originally Posted by Stu @ M Developments
The screw is what we call a global modifier in as much as it adds a percentage to the entire fuel map.
If your engine is just borderline safe on boost, leaning the CO can and will destroy the engine when flat out. The correct base position is in the region of 5 turns clockwise and 2 turns anticlockwise to put you back in the ballpark, but this is of course dependant on MANY MANY factors such as heads, cams, sensors, fuel pressure etc etc...
If your engine is just borderline safe on boost, leaning the CO can and will destroy the engine when flat out. The correct base position is in the region of 5 turns clockwise and 2 turns anticlockwise to put you back in the ballpark, but this is of course dependant on MANY MANY factors such as heads, cams, sensors, fuel pressure etc etc...
its all standard, head cams, all sensors work etc.
so the car has to be adjusted on a rolling road? or is the 3% @ idle a ball park for CO? i have access to an analyser but cant do it live.......as such
#15
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just spoke to power engineering and they said this screw is 'only for idle' and they just adjust it till the engine is 'happy' sounds and runs smooth.
they said the majority of the fuelling should be governed by the ECU map, map sensor and fuel pressure.
it may take a while to get this, and the iscv - high idle issues sorted
they said the majority of the fuelling should be governed by the ECU map, map sensor and fuel pressure.
it may take a while to get this, and the iscv - high idle issues sorted
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#18
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OMG......
i followed stu's instructions, 5 turns clock...2 turns anticlock. took me a while to figure that it is a potentiometer...
i was turning the thing for bloody ages with the engine off to get it in a closed position
also following SECS and Richm's instructions to check the tps. and guess what.......
it now runs....sweet....iscv is working as it should be!
just gotta get the co checked before i give it a bootfull.
i followed stu's instructions, 5 turns clock...2 turns anticlock. took me a while to figure that it is a potentiometer...
i was turning the thing for bloody ages with the engine off to get it in a closed position
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
![Surprised](https://passionford.com/forum/images/smilies/bigcry.gif)
also following SECS and Richm's instructions to check the tps. and guess what.......
it now runs....sweet....iscv is working as it should be!
just gotta get the co checked before i give it a bootfull.
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