Turns over, got power, no start...

[DawgTSi]

97 Sonoma, 4.3 V6, 4X4, Vortech VR-2 S/C kit, 140K miles.

 

 

Check engine light was on indicating that 2 of my O2 sensors were bad last month. I replaced them and immediately the truck ran better and the CES light was cleared. After about a week, the CES light came back on, put the scanner back on it, still threw the O2 sensor codes. I didn't think too much of it, figured I'd get to it when I had time as the truck still runs.

 

Yesterday, truck ran fine. Ran errands... no problems. I came home, parked the truck, no problems. I came back out a few hours later to go run another errand, and the truck wouldn't start. Here's what I know:

 

Have plenty of power in the battery (Optima Red Top), truck turns over.

Bout 1/4 tank of gas.

Checked and changed all pertinant fuses in the fuse box in the dash.

Fuel pump is charging the fuel lines (can hear it when key is turned on).

ECU is getting power (can hear it when the key is turned on).

 

The CES light is still on (when the key is in the ON position, doesn't go out) but I put the scanner on it today and it read that the truck isn't returning any codes. Not even the O2 sensor codes.

 

I'm assuming that I am getting fuel since I hear the fuel pump kick on (and it is a high flow fp, so it is aftermarket, replaced within the last 30K I'd say). I haven't pulled a plug and checked for spark yet though. Reading through my manual, I am guessing that I have the Enhanced Ignition, yet the images in the manual don't show the location of the coil pack (to the passenger side of the intake, from what I can tell). It looks to be a real pain in the ass to take off, so I want to avoid that if at all possible.

 

Can anyone give me some direction here? Maybe some kind of clue?

 

 

Thanks in advance.