Rats chewed wiring in engine compartment

In the engine compartment power distribution box and it is labeled as anti theft system relay.

try to find a old Motors manual or Chiltons for it or ask the parts guy at a chevy dealer for it

Get it scanned again. If you bought cheaper ones at the parts store instead of oem ones from the dealer you are probably going to be doing them again. The upstream and down stream 02 sensors communicate with each other so it could be the upstream sensors even though it says downstream. I ran into this problem myself.

czyrnchr2, Yes, there are fuses that may be blown out. The chewed wires may have touch and blew a fuse. In the fuse box in the passenger compartment look for a fuse that feeds either the gauges or dash board. Also check the power distribution box in the engine compartment. Good luck with this.

Hi,
Have you put a new battery in the car? If so and it still won't start, try retracing the wires under the hood to be sure the rats haven't chewed through any of them!
- Carbonrue67

SMELL GAS YOU NEED CHECK ALL FUEL LINES UNDER THE HOOD IN THE ENGINE COMPARTMENT.IF GAS IS STRONG UNDER HOOD YOU DONT SEE LEAKING FUEL LINES.YOUR FUEL RAIL FUEL INJECTORS LEAKING OR FUEL PRESSURE REGULATOR O - RING OR DIAPHRAM LEAKING GAS.IF FIND NO LEAKS UNDER THE HOOD CHECK FUEL LINES UNDER CAR FROM ENGINE TO FUEL TANK FOR LEAKS.IF ALL IS GOOD YOUR EVAPORATIVE CANISTER SOAKED WITH GAS OR YOUR EMISSION EVAPORATIVE SYSTEM NOT WORKING. DEALERSHIP HAS TO CHECK AND FIX.

lots of small screws and alot of time remove the entire lower part first then the vents for defrost then the screws on top then the center bolts then the side bolts disconnect all wire harnesses

the spark on your engine is controled by a componet called "opti-spark" it is located behind the water bump. it acts as your distribitor and ignition coil. they are a bit time consuming to change out and are very expensive! i would suggest having your local chevrolet dealer diagnose it just to be sure due to the expense involved for this unit. i hope this helps you..good luck

ps as i recall from my chevy dealership days, i beleive it was around $1000 installed..but that was a few years ago..proice could change either way now..

99% chance of bad fuel pump

no special tools fairly easy job just make sure you bleed the air out of thr cooling system properly or you will quickly damage the motor