cold engine noise

[David Linam]

Can anyone tell me what this noise I'm hearing I have a 96 250 when u crank it up it has a hissing noise that u can hear in the cab but when u pushin the clutch the noise stop then when the engine warms up it quits alltogether just started this. Thanks for taken time to help.

[Gear Jammer]

I cant help you but i had a 96 also and when i had it around 85,000miles it started to do the same thing. It has 92,000 on it now and no probs. But i would like to know what it is when you find out let me know. Its a auto and it only does it at idle.

[Pyrometor]

I am not entirely sure but it might bet the valve in pipe exiting the turbo (which is the exaust brake). If you can hear the hissing sound from the exaust pipe then that is most likely what the noise is , especialy if it stops the engine temp reaches a certin point. Just a shot in the dark. Hope it helps

[Fis Teck]

It's not an exhaust brake but the warm up valve. It colses when engine is cold to help heat up the motor.

[f250powerstrokeman]

did a 96 psd even come with a warm up valve someone please infrom me

[Pyrometor]

I have not heard of that. I just asumed it used the brake valve for that. Wear is the warm up valve located?

[Fis Teck]

At the outlet of the turbo.

[Fis Teck]

All powerstrokes form 94 to 02 and all the 6.0L. have them with a few exseptions. Some of the van 7.3l did not.