How to understand datalog?
Thread Starter
Race Director
Joined: Oct 2011
Posts: 16,076
Likes: 816
From: Dallas Texas
2025 C4 of the Year Finalist - Modified
How to understand datalog?
Well I was going to post this in scan and tune, but there is little action in that section. My Bluetooth obd1 cable should get here sometime this week. I've never datalogged before. Bought it to figure out why I'm running rich and getting really sh!tty mpg. Anyways, how will I know if say my MAP sensor is bad? I say MAP because my car is a 1993. Basically, how will I know if something out of the ordinary?
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
You should use a vacuum pump to test the map sensor. You should be at 5 volts I believe with 0 vacuum. Every 5 inHg should drop the voltage by 1 volt. You need to apply a voltmeter to the signal wire of the map sensor with the key on engine off.
