I can not for the life of me find one single vacuum line on my 2004 chevy 2500 8.1L, also has no EGR valve. I have an Idle bounce and am trying to figure out what the problem is. Took the fuel pressure at the rail. At KOEO was 55psi, KO pressure holds. At idle it reads able 63psi and will rise some with some throttle. All looks normal to me, anyone think differently?
Then took a can of break cleaner to the intake manifold gasket and parts of the TB, nothing. This is why I ask able the vacuum lines, shouldn't there be some or because it uses MAS, MAP, and other sensors to do its calculations it doesn't need vacuum lines?
Truck runs fine, no codes, just hate not being able to figure it out!!
Regards
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Then took a can of break cleaner to the intake manifold gasket and parts of the TB, nothing. This is why I ask able the vacuum lines, shouldn't there be some or because it uses MAS, MAP, and other sensors to do its calculations it doesn't need vacuum lines?
Truck runs fine, no codes, just hate not being able to figure it out!!
Regards
Sent from my SM-G530T using Tapatalk