Car take 4-5 second before it start and throwing code
 

1997 Camaro Z28 automatic 133k miles. K&N intake, every thing else STOCK.

My car take 4-5 second before it start, and sometime it start right up. it currently throwing 4 code.
P0172 System too Rich (Bank 1)
P0175 System too Rich (Bank 2)
P0400 Exhaust Gas Recirculation Flow Malfunction
P0400 ( pending, that what it say on code reader ).

I clear it out and drive for 1 min the code came back.

EVAP system needs attention.. im interested to see the likely causes...

TTT:engarde:

Clean your EGR valve with carb cleaner. (Don't let the stuff get on your hands, paint, or anywhere else if you can help it.) Make sure there are no leaks from the EGR. I'd say clean your throttle body as well while you're at it (put paper towel under the TB opening; you don't want this stuff dripping on the rest of your engine). See where that puts you and get back to us. Do note that the EGR valve does have a gasket, so before you take it off, you might want to pick up a new one just in case.

For being a noob, where is EGR valve locate on 97 z28 ? thanks

Not sure on a 97. It should be visible easily enough. It will be something that comes up from one of the exhaust manifolds. Look up the part on a parts website like Rockauto, and try and find the part that looks like it.

This may of course not cure your issue, but do that and we'll see where you're at then.

Thanks, I see where it at now, I clean when i get off work. btw how hard is to change the fuel filter ? thanks

It's easy if it's not too rusted. Before you start, unplug the fuse for the fuel pump and try to start the car. That'll clear a good amount of the fuel out of the lines. Then you can do it easier. Keep your face away from the filter when you unhook it. Have some rags and perhaps a small bucket ready.

I need to get off my lazy ass and replace mine sometime, too.