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Just started getting a code 13 error (open o2 senser loop) tonight. Have been mixing in some locally bought 100 octane race gas from a local Amoco/BP station this summer and I'm wondering if this fuel might have lead added. Anyone know if this fuel at 100 can be true unleaded or do they add lead to boost the octane. I know this is kind of a stretch to answer, just thought someone else might have the same fuel available in their neck of the woods. Also I just changed the chip to the caspers 7 postion chip and have been trying it out for the last week. Pretty sure it's not a chip issue.
87 GN
Hooker exhaust with test pipe
XP pump with hotwire kit
160 tstat
fuel pressure 40 pounds at idle
power plate (just installed last night)
TB coolant bybass
Stock style K&N air filter
Casper 7 position chip (Generic one for stock injecters)
Have about 95.6 octane mix before a can of NOS Octane booster "racing formula" was added.
Chip set to position 5 (98 octane)
 

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There's 100 octane leaded and 100 octane unleaded...you sure you got unleaded? I put a gallon of C16 in my tank with 1/3 tank of 93 and two gallons of 100 unleaded and now I throw a 13 periodically. Eventually you'll need to replace the sensor...but if your 02's aren't slow, roll with it for now.
 

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You need a sensor now. It's fried.
 
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