It seems that recently my 97 Z28 has been taking longer to crank when the engine is cold. You can hear the starter crank for about 3 seconds before the engine will kinda sputter and start. Before on cold starts the engine would start almost instantly and sound strong. Warm starts are always perfect still. So what can cause my car to have long cold start cranks?
Thanks

 

I had the same prob, it was the gas pump

 

I have a 97 Z. My fuel regulator would not hold pressure @ start. The vac tube on the regulator leaked back to the vac source. Once I replaced it, it fired up almost instantly. I had an aeromotive regulator go bad. They said it was due to a NEW fuel aditive. LT1 areromotive regulator was $155.00

 

You'll want to grab a fuel pressure test gauge and read the pressure at both turn-key and at idle. Key on, engine off should read around 42psi, and when idling should read about 5psi less, and slowly increase with throttle position. Any deviance in these conditions can indicated a fuel system problem. If pressure drops, you have a leaky injector, bad regulator, or the fuel pump is bad. There is a check valve in the fuel pump that prevents fuel from flowing back through the pickup, to keep the lines primed for the next start. If the valve is bad, that can cause a delayed start. You would need to replace the fuel pump.

Remove the vacuum line off of the fuel pressure regulator and see if any fuel comes out. As mentioned in the prior post, that's a sign of a bad regulator.

Good luck.