Ok yes this makes sense, so as of right now it looks like i have to adjust the base idle with the IAC unplugged and then see what it does after it’s plugged back in. I mean unless you have another recommendation? I just want this thing to idle at no more then 700 in neutral (truck is a 5 speed)
Run engine til it's warm. Shut it off and jumper pins A and B. Turn key on, do not start. Wait 10 seconds, and then unplug the IAC. Confirm It has closed all the way. You should be able to see the tip if it through the top of the throttle body. Turn key off. Remove jumper across A and B. Start engine and turn manual idle adjustment screw counter clockwise until the idle comes down. Check to make sure that the throttle shaft is actually resting on the manual idle adjustment screw and it isn't bound up in the body of the TBI. Now you should be idling in spec. Shut off and reconnect IAC. Restart engine and see what it does.
Is there a way for me to read my rpm’s digitally while doing this? I can’t use my scanner because when it’s in diag mode the rpm’s fluctuate. And i don’t really trust the factory gauge.
IMG_2975.jpeg not sure if the pic went through, but yes, coming off the coil there is a white wire with a connector which was/is used for diagnostic tach purposes by gm techs. I used it when I changed my half moon gauges to the needle gauges with a tach. You just need an auxiliary tach. It will give you a true rpm. Oh cool it did.
So any aftermarket tach will work? I would like a digital one instead of needle that way i get he most accurate number
Another option is to hook up tunerpro with an ALDL to USB cable with a laptop. If you can find a definition file for your ECU. That will give you the computer's reading for what RPM the engine is spinning digitally.
I just bought a digital tach from eBay, once i hook it up i will do the base idle adjustment and see what happens. I was going to buy a aldl cable but the manufacturer never got back to me on my
Question about the cd/usb that comes with the cable so i never purchased it. My
Laptop doesn’t have a cd drive and the usb option was on back order. I do have the ADX file for my
Ecu to be able to see live data on tuner pro i just don’t have a cable
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