First off I just installed a new oxygen sensor a few weeks ago. So this morning on my way to work my service engine soon light came on and didn't go off until I turned the engine off. It went on while I was on the freeway going between 75-80 mph, my temp. gauge said the engine was at like 125-130(it was 730 in the morning though) after like 30 minutes of driving which I thought was very strange. I don't know what temp theromostat I have I think it is a 160, my car rarely goes over 160 only with the ac on in traffic will it go higher. Should I get a new thermostat? I'm going to change the coolant in the next coulple of days. A little off topic does anyone know if I could change over to dex-cool the orange coolant?

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'91 Z28 305, Auto trans, K&N filters, TPIS air foil, power pulleys, ported plenum, hypertech chip, hooker cat back, kyb shocks, STB, SLP 1 5/8" headers, catco 3" cat, 14.7@ 93 mph(need new times after exhaust)

 

First of all I have to say this IS off topic but my name is also Casey and I have a 91 Z28. What are the odds? Now if yours is black like mine we may be clones...

 

Mine is red.

 

well you have me beat on times and mods and probably on looks (car that is) mine has a lot of scrapes on the front spoiler. I am sure you know what I mean.