[Diy_efi] help w/dyi-wb please

[JMSMAUTOMOTIVE at cs.com]

i just compleated my first "trial" dyi-wb board. i have tried to test the 
heater circuit with a tail lamp bulb and also the o2 sensor, the result is 
the same, no led. with the bulb hooked up, it slowly comes on, and stays on, 
bright, indefinatelly, and the led will not light. my hunch is that i need to 
add a resistor or two in parrallel with r4 as stated in the assembly guide. 
my problem is that i ordered all the parts from digikey, and i have no idea 
what kind of resistor to add. the dyi-wb web page doesn't specify what kind 
of resistor to use. my other question has to do with using the sensor, in the 
assembly guide it states that if the led goes out at any time to remove the 
sensor from the exaust stream or damage may occur, why?? does it hurt the 
sensor to be in the exaust stream without being @ temp? or is it just that 
rapid cooling may crack the internal structure? i plan on using this to tune 
many cars, so it would be nice to know what ,how ,and why dammage can be 
caused. thanks joe  

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