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
This manufacture has a thumb drive with there cables. I was in the same boat, no cd drive. It’s where I got mine.
https://obd2allinone.com/products/aldlobd1u.asp
Last edited by TriumphR3; 04-05-2024 at 04:41 PM.
Hi guys, i know it’s been while and honestly i haven’t even messed with the idle i just gave up On it for a bit to finish up the truck but i did get an aftermarket RPM
Gauge so once i hook that up i will be able to see my rpm’s digitally and get a better idea of what the idle Actually is. I did notice something very wierd though, i got my ac charged recently and when the ac is on, the trucks idle drops, as soon as the compressor kicks off it increases back to right around 1k, isn’t it suppose to be the opposite? I taught the ac being on will increase the rpm?
Last edited by maronielb; 3 Days Ago at 09:03 AM.
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