I have a 2000 ZR2 that has a no start problem. I checked the fuel pressure at the filter and it was border line and was leaking down quickly. I installed a delphi fuel pump and checked the pressure again? Spot on
but still no start. Checked pressure at the port and it leaked down pretty fast
Got a new spider assembly. and it is holding at 55. I was wondering if the injector is getting power? What would and where would I check for that. Thanks

 

Does it crank?

If it does then its either:

Fuel delivery
Ignition/timing
Air
Mechanical issue

Given that fuel pressure is OK then the next thing to check is ignition/spark. When cranking look for 1" of strong blue spark with good cadence at a wire plug end on at least two cylinders.

For Injector coil firing signals you use a noid light. This is ground side switching so the first thing you can do is check for power on all the injector pink wires.


George

 

I have sprayed fuel in the engine and it runs great until the fuel is used up ,just a second or two. But I have no clue as to where the pink wires are you are referring to. Is it the harness at the back of the upper intake? Unplug it and check there? Papajim

 

It’s the harness connector that feeds the spider assembly. I believe it’s behind the throttle body. It’s been ten years since I took the intake apart and I won’t be at that truck today. Maybe someone can give an assist. I’ll get that connector pin out tonight when I am at my manuals.

George

 

Here you go, plug 1:





George

 

good deal, I will check this out. Thanks

 

Let me know if you need any help.

George

 

All of the injectors are getting fire. The grounds are pulsing, which is what works the injector, or at least is the way I understand it. I'm going to run another test on the pump and at the port.

 

How did you test for ground pulses?

Next measure the disconnected coil resistance of each injector.

George

 

I used a test light, I used the positive on the battery and probe the ground, it flashed on all grounds tested, of course doing one at the time. Fuel pressure at pump is 82 pump running and 77 at 10 min. Port was 58 pump running and 48 at 10 minutes. New delphi pump but new tamerx spider. Testing the.coil resistance is new to me, afraid I don't know how to do this
papajim