Trans am Starting issue, Fuel Pressure Regulator?

[mrfriendly23]

Hello, I have a 1998 trans am convertible and have a starting problem. I have had the car for over a year. It would start cold just fine, but when it start warm it will take around 8 seconds. Also would start kinda ruff and would have a whining vibration noise for around 15 seconds after started. I have talked to some and they said it may be the fuel pressure regulator or the fuel pump. Any help would be greatly appreciated, Jim

[JayTA98]

is the whinning noise coming from inside the fuel tank?

[Cutlass]

Hooking a fuel pressure gauge up is a quick/easy way to tell if its a fuel pressure problem. sounds like it could be

[mrfriendly23]

Thanks both for yr replies. The noise is mostly under the hood. The sound from the back end is the normal fuel pump sound. Yes i will use a gauge and to see what it is. Now if it was the fuel pressure regulator would there be a noticable drop off or a low constant pressure during the time of the noise?

Thanks

[Cutlass]

The fuel pressure would be low on an extended crank.

Also would start kinda ruff and would have a whining vibration noise for around 15 seconds after started.

This noise sounds like it could be the Secondary A.I.R. pump
Refer to this thread for further AIR help.
Secondary Air: Diagnosing and Removal