The Big Meanie
Join Date: Apr 2005
Location: Northern Michigan
Thanked 235 Times in 153 Posts
First things first....WELCOME to the garage!!!!!!
I think I can help ya a little bit. The hissing sound you are heatring when the truck is cold is the exhaust backpressure valve losing. It closes when the motor is real cold to hold in exhaust gasses to help it warm up faster. If you are driving and it does it, you will have virtually no power and no speed. It's not a big thing, nothing to worry about. It's doing what it is supposed to do.
My 95 idles real rough for the first 20 seconds or so when it is started cold. Done it for years. A long time ago, I had the shop check it all out. Glow plugs, relay, you name it, they checked it. Nothing was wrong. Truck has done it the whole time I have owned it. After like 20 seconds, the idle smoothes right out, and it is fine.
I dont know what codes you have thrown. Cant help ya out there.......
1996 Dodge 3500 Ex. Cab LB Wide Hipper
Boys Stroke It...Men RAM It
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