What I'm I Doing Wrong With My CO Setting (Pic)
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I received my Gunson Gas tester and wanted to set my CO to 3% after installing my new headers. I pushed down on the screw all the way and turned it many times left or right with no change at all. I'm I suppose to install an allen wrench on top and then turn it?
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Originally Posted by Bernard
I received my Gunson Gas tester and wanted to set my CO to 3% after installing my new headers. I pushed down on the screw all the way and turned it many times left or right with no change at all. I'm I suppose to install an allen wrench on top and then turn it?
![](https://rennlist.com/forums/attachments/911-turbo-930-forum/34616-air-intake-system-for-1989-930-information-please-mvc-440s.jpg)
![](https://rennlist.com/forums/attachments/911-turbo-930-forum/34616-air-intake-system-for-1989-930-information-please-mvc-440s.jpg)
Clockwise=RICH
Counter=LEAN
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Yes, you must use the allen wrench. No pushing down without the allen won't work. Insert the allen in the top of the plunger. DO NOT DO THIS WHILE THE CAR IS RUNNING. Turn in very small increments as it only takes a little movement to make a big change. Start the car, rev the engine a couple of times, let it settle down , and test again. Repeat as necessary.
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Originally Posted by equality72521
Yes, you must use the allen wrench. No pushing down without the allen won't work. Insert the allen in the top of the plunger. DO NOT DO THIS WHILE THE CAR IS RUNNING. Turn in very small increments as it only takes a little movement to make a big change. Start the car, rev the engine a couple of times, let it settle down , and test again. Repeat as necessary.
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Originally Posted by Bernard
OK... Thanks a ton. So why did they install the spring rod? I thought it was because you wouldn't need the allen wrench just push down in turn.
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Originally Posted by equality72521
Yes, you must use the allen wrench. No pushing down without the allen won't work. Insert the allen in the top of the plunger. DO NOT DO THIS WHILE THE CAR IS RUNNING. Turn in very small increments as it only takes a little movement to make a big change. Start the car, rev the engine a couple of times, let it settle down , and test again. Repeat as necessary.
Is it a safety reason you don't recommend adjusting while the car is running? Everyone I know, techs included, adjust while the engine is running. Just be careful of the belts/fan. I've not used the gunson tester as I have access to professional machines, but I would imagine the gunson would give the best readings if it wasn't cycled on and off.
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Originally Posted by SoCal Mike
Is it a safety reason you don't recommend adjusting while the car is running? Everyone I know, techs included, adjust while the engine is running. Just be careful of the belts/fan. I've not used the gunson tester as I have access to professional machines, but I would imagine the gunson would give the best readings if it wasn't cycled on and off.
I guess its a matter of preference, but I always adjusted mine while the car was running.
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Originally Posted by SoCal Mike
Is it a safety reason you don't recommend adjusting while the car is running? Everyone I know, techs included, adjust while the engine is running. Just be careful of the belts/fan. I've not used the gunson tester as I have access to professional machines, but I would imagine the gunson would give the best readings if it wasn't cycled on and off.
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Gently insert your allen wrench so you aren't pushing down or altering the position of the sensor plate with the motor running till you feel it engage.
Then turn it the smallest amounts, motor running.
clockwise or, right= rich
counterclockwise or, left=lean
You won't hurt it if you don't press down on it and make it way too rich for a moment and caues a backfire or something..
It has to be a short allen wrench or heat it red hot and bend it at a 90 dgree angle to fit it under there....
Then turn it the smallest amounts, motor running.
clockwise or, right= rich
counterclockwise or, left=lean
You won't hurt it if you don't press down on it and make it way too rich for a moment and caues a backfire or something..
It has to be a short allen wrench or heat it red hot and bend it at a 90 dgree angle to fit it under there....