5.7L running too lean (very high NOx), won't pass state emissions

[Fast355]

Fast355, I will check the timing and fuel pressure. However, I have a question about the injectors. Since this is a throttle body with two injectors, how do I tell what size they are? If I remove them, will there be a number somewhere on them? I have attached two photos, one shows Rochester Products 155Z64 and the other a number 312. As you can see from the pictures, both are on the throttle body. I don't know if the injectors have separate part numbers.
Lee

If they are GM injectors the factory part number will be eteched into the top of them. Should be able to read the numbers without removing them.

I know my old TBI in my 1983 G20 van passed with a fraction of the allowable limits. It was also not stock at the time. Had an edelbrock intake, 454 TBI unit, open center TBI spacer, 1.6:1 roller rockers, and doug thorley tri-Y headers feeding a large high flow 3" converter.

This was the last smog test it ever had to go through.

[bigmac]

This part number is on the injector body AC 112. Next to it is another number 17064317. However, when I search AC Delco's website, it says both numbers don't exist. See
Lee

[Fast355]

This part number is on the injector body AC 112. Next to it is another number 17064317. However, when I search AC Delco's website, it says both numbers don't exist. See
Lee

If they are factory injectors where the injector connector clips there will be two painted strips. A 350 truck injector will be Orange/Black.

[Fast355]

This part number is on the injector body AC 112. Next to it is another number 17064317. However, when I search AC Delco's website, it says both numbers don't exist. See
Lee

If they are factory injectors where the injector connector clips there will be two painted strips. A 350 truck injector will be Orange/Black.

The pic you posted is for the fuel meter body. Each injector will be stamped itself. Under the injector connector.

[Fast355]

These are Marine high pressure injectors. Pink/Purple....Notice the rusty looking area on them. That is the factory stamping ID.

[bigmac]

Well, here are three photos of my injectors. One of them shows the orange and green wires and an orange marking on the front side of the first injector. The second photo clearly shows a black marker on the back side of the first injector. The third photo is looking down into the bottom of the first injector where if you zoom the picture you can see a large number 5 on one side and I think a small number 02360. So, are these 60lb injectors?
Lee

[Fast355]

Well, here are three photos of my injectors. One of them shows the orange and green wires and an orange marking on the front side of the first injector. The second photo clearly shows a black marker on the back side of the first injector. The third photo is looking down into the bottom of the first injector where if you zoom the picture you can see a large number 5 on one side and I think a small number 02360. So, are these 60lb injectors?
Lee

Those are 61s.

[bigmac]

So, injectors are good. I also tested the fuel pressure at the outlet of the fuel filter and it measured 14lbs. See attached photo. Since the fuel pump is in the tank and it is a pain to get to the metal fuel line connecting at the bottom of the TBI, I took the easy way and measured it at the fuel filter.
Lee