For those of you with the 4.0 HO I6 and a vac gauge, what is the manifold vac at idle and in drive when your engine is warmed up.
I'm getting N 16in D 14.25in
vac needle is rock steady so I know if it is low it must be a common rail (probably the gasket under my blower again).
yay.
Doug,
Not sure of the exact numbers for a stock 4.0, but it should be about 18" or so in N. The fact that you have a blower on there will reduce it a bit, even at idle, so I would make an educated guess that all is normal for you.
Chris
c did pass the time by typing:
That's what is bugging me, 20-18" is what I expect for a tight carb setup but the I6 is fuel injected so vac isn't as critical as it used to be. I was watching the vac gauge for signs of sticky valves/leaking guides/or a plugged exhaust. It's all good except for the question in the back of my mind about the idle measurement.
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