So I developed an issue on my unreliable z. I was getting all three 02 codes so I replaced them all and it was fine for a few months. Now I got all three and an maf and I deleted them. It was getting hard to start some days I would crank a while and send a puff of smoke out of the throttle body. Then start and Monday I get in and it just cranks sputter crank sputter. Won't start. Here's a list of things I've replaced.
- spider injector a day old
- rotor and cap a day old
- fuel pump 11 months old
- plugs and wires 6 months old
- 02 sensors 4 months old
- battery and alt 6 months old

I'm getting 62psi at the rail and it holds for a few minutes. I put a spark checker and I'm getting spark out of the coil and into every plug. So I'm getting spark and I'm getting fuel. Please help me. Its an 01 ZR2 Blazer.

 

i have the same problem with a 98... just bought it for 500 and know nothing about it except it dont run... really dont want to swap the engine

 

Fuel pressure at 62psi is good, does the pressure remain above 55psi for at least 10 minutes after the pump shuts off?

What brand of cap & rotor did you install?

When you checked spark, was it able to jump 1/2" gap with a blue, not orange, spark?