2000 zr2 put a code scanner on it. Ok here is the info I got. Says no codes stored. Got it to run for 3 min then stumbled and shut off. Under dtc's it says INC next to cat monitor and n/a next to sec air system and INC next to EGR system and mil status says off is that normal? Everything else says ok next to it.

Truck will run for a few min then stumble and die and not restart for a few days. Has new fuel pump, wiring for pump, dist, ign module, cam sensor, coil, fuel filter, etc


Also it does not have a cat and never through a code for it..

 

So I'm guessing it's loosing fuel pressure at the reg or injectors once it runs for a min.

 

My first thought was Fuel pump and Ill tell you why, I bought a fuel pump off line for like 80 bucks and this thing was new in the box. Two month's later I was buyin a new one and the guy at chevy said it had to be A/c delco or delfi ($226). But the problem I was having was the fuel pump would work until It got hot then the truck would shut off, but it would start again when it cooled off. Next time you drive it and if shuts off turn the key back and forward and see if you here the pump running.

 

+1, do a fuel pressure and leakdown test. Key on, engine off! It should be 60 to 65 initially and not go below 55 for 10 minutes. Post back your initial number and 10 minute later number.

 

You can also do a fuel pressure test. And then you will defantly know, you can borrow one from Auto Zone and what ever the deposit is you will get it back.

 

I didn't realize you could rent one. I'll try that. The pump is brand new and worked fine and can here i
it run. It won't start even after everything is cooled down sometimes it's days.

 

If the fuel test comes back ok the next thing would be to test the spark, but one thing at a time.

 

Well spark soon be good if it starts sometimes? I would think? That would prove its getting enough spark.

 

It may not be getting good spark. But still start with the fuel tests.

 

When I go to check the fuel do I hook it in a line or the test port to determine if the reg and injectors are ok?