Adjusting co2 mixture in 5kcstq?
08-11-2006, 04:07 AM
#1
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Adjusting co2 mixture in 5kcstq?
Guys,
Any way to adjust the co2 mixture at the fuel distributor without using a dwell meter? I don't have one, and I'm fairly certain my mixture is running a little lean.
TIA,
Jim
Any way to adjust the co2 mixture at the fuel distributor without using a dwell meter? I don't have one, and I'm fairly certain my mixture is running a little lean.
TIA,
Jim
08-11-2006, 05:59 AM
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Re: Adjusting co2 mixture in 5kcstq?
Hmm..
Even if you 'adjsutst' the mixture, the o2 sensor will detect and correct.
Until of course, you adjust the mixture out of the frequecy valve/Ecu control range.
Then, you 'd probably be runnign open loop at some odd mixture.
If you suspect you mixture is out of whack, then measure the voltage on the o2 sensor (while still connected to the ECU).
From http://www.sjmautotechnik.com/trouble_shooting/injector.html#osens
"With the fuel system in closed loop operation, the O2 sensor voltage cycles up and down between ~0.1V and ~0.9V. At idle, the O2 voltage should cycle back and forth 1 to 2 times per second and when cruising, it should cycle back and forth 4 to 5 times per second. This cycling occurs because the engine computer senses the O2 voltage and then changes the frequency valve duty cycle in response."
Even if you 'adjsutst' the mixture, the o2 sensor will detect and correct.
Until of course, you adjust the mixture out of the frequecy valve/Ecu control range.
Then, you 'd probably be runnign open loop at some odd mixture.
If you suspect you mixture is out of whack, then measure the voltage on the o2 sensor (while still connected to the ECU).
From http://www.sjmautotechnik.com/trouble_shooting/injector.html#osens
"With the fuel system in closed loop operation, the O2 sensor voltage cycles up and down between ~0.1V and ~0.9V. At idle, the O2 voltage should cycle back and forth 1 to 2 times per second and when cruising, it should cycle back and forth 4 to 5 times per second. This cycling occurs because the engine computer senses the O2 voltage and then changes the frequency valve duty cycle in response."
08-11-2006, 06:48 AM
#3
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Re: Adjusting co2 mixture in 5kcstq?
I repeat if you do not know what you are doing do not I repeat do not touch the Co mixture screw.The way you can tell if it's working sub-par is listen by your airbox for a buzzing. This buzzin should be constant IE it should not pause if it is pausing turn the 3mm allen to the right until it resumes buzzing constantly be careful too far and no more car. Hope this helps.<ul><li><a href="http://www.motorgeek.com/">http://www.motorgeek.com/</a</li></ul>
08-11-2006, 08:08 PM
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Well hold on, going clockwise is just going to richen it up and not "kill" the car.
Back to the issue though, grab a dwell meter, those things are cheap and before you open up Pandora's toybox are you absolootly sure there are no vac leaks? Maybe even a bad temp sensor?
08-12-2006, 04:26 AM
#7
You can't be "Fairly certain"...
You need to be "Certain". Measure the O2 sensor voltages as Frank described. Listen for the buzzing as DasYoFro said as well. A meter can be had for $20 so if I were you I'd suck it up and spend the bucks. Tools are always cool.
Turning cw makes the mix richer. ccw makes it leaner. Once it is in the ballpark the system is VERY sensitive to adjustments.
Turning cw makes the mix richer. ccw makes it leaner. Once it is in the ballpark the system is VERY sensitive to adjustments.
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