What OBDII codes show up when the vehicle is scanned?
Remember it takes 4 things to run - air, fuel, spark, compression. Do you have spark? What is the fuel pressure? Have you changed the fuel filter recently? Is the air filter clean or is it completely clogged from years of neglect?
I apologize for the brevity of my OP. It's a stock 4.2l with fuel injection. I was chasing a p0300 code so I had the air intake tube and plenum thing off so I could access the coil packs but the car wasn't misfiring like it was before I took it apart. So I started thinking the 2 month old air filter or maybe the map sensor was the issue. So I stuck the tube directly onto the throttle body and while the engine was running, covered the open holes on the end of the tube with my hands to, in my mind, simulate a clogged filter. I guess I sealed it a bit better than I hoped because I choked it to death. Now the engine won't start back up.
Yes, your 2003 TrailBlazer with the 4.2L I6 engine does indeed have a fuel pressure regulator. But first, you need to check to see what the fuel pressure is because even with a bad fuel pressure regulator the engine will start and run. It might not start as easily as it normally does, but it will start.
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