I don't have a diacom or any other scan tool for that matter. Is there a way that I can test for open and closed loop?

Thanks,
Lars

------------------
'92 RS 305 TBI
K&N Open Element
Ultimate TBI mod's (thanks Pablo)
Cam[.442"/.465" x 218*/224* @ .050", 10:1 Hypereutectic Pistons
Performer Manifold
Shift Kit, Corvette servo,
and 2800 Stall Trans Specialties Converter,
Gutted Cat, IAT Resistor
MSD Blaster Coil, Accel Cap and Rotor

 

I believe it's jumping the ALDL connector while the engine is running. The SES light will flash steadily. I think quick flashes means open loop and slow flashes mean closed loop. I'm positive though, I can't find that section in my book. But it's something like that.

 

Does anyone know if this method of testing open/closed loop is correct?

thanks

------------------
1986 Trans Am
305 TPI
"If it's not one thing, it's another!"
http://www2.hanover.edu/hierlmeier

 

Its correct. Dont do that on carbed cars tho.

Its 2 1/2 times/sec open loop and once/sec closed loop. You can even tell if its rich or lean from the light, I forget which is which, but it either stays on a long time or off a long time, and one way is lean and the other is rich. Not real accurate, but neither is an o2 sensor.