Re:diy af meter help
 

I installed it and it read all the way rich all the time, except when I let off the gas and it's in gear, then only one light is on. I have the pot to adjust resolution, and when I turned it all the way one way 4 or 5 lights were on with 0 throttle in gear and now I have it all the way the other way, is my car just really rich?

Re:diy af meter help
 

I guess that is why they aren't really designed for tuning! Only way to know for sure would be to use a multimeter to test the voltages and make sure your graph is displaying properly. Aren't you still NA? If so, and the graph is correct, I don't think you should be that rich. Well now that I know it works (somewhat), I guess it is time to get my butt in gear and buy some new components so I can start over!

Re:diy af meter help
 

if I grounded it all after the resistors would that mess things up? I'm going to redo that and see what happens.

Re:diy af meter help
 

ya, I'm NA. I think the richness is due to the high water content inside my cylinders thanks to my leaking head and block connection. I'll lean it out with my diy afc and see what happens once I get the gauge working.

Re:diy af meter help
 

last time i ordered 5 chips, ending up burn off 4 chips before i found out the chips in this graph was place WRONG. u will have to turn the chip around. :P

Re:diy af meter help
 

how do you mean? did your gauge work at all? and lights going on? mine lights up and all, and changes too. is the crescent in the side of the lm chip at where it says number 1 in the diagram or not?

Re:diy af meter help
 

yea that little dot at the corner is #1...
what happened is that right after i power it up, all the LED became kinda dim..then the chip gets real hot and burn off.
so i looked up the diagram of the chip and found out i will have to turn the chip around, so #1 became #10, #9 became #18.. ???

Re:diy af meter help
 

mine stayed on for about 30 minutes while i was messing with it, I must have done it right.

Re:diy af meter help
 

Hmm. Kyle, so did you wire it according to the diagram, or do you have your chip upside down? Yes, the crescent should be on the side with pin 1.

Donald125, What do you mean, they "burn off"? Do they smoke or something, or just stop working??

Re:diy af meter help
 

they heat up, smells then unit die. :(
trust me, i`ve been working on these electronic ---- for 10 + yrs. i`ve also looked up the dirgram of the chip.