bad boost gauge or other?

[pep240sx]

Last night when Idrove home from a friend's house, I noticed my boost gauge would not show vacuum like it normally does. Even when the car is idling, it registers only zero. the car starts and runs fine, so I know there is at least some vacuum. The boost gauge registers boost fine, so does this mean the boost line is collapsing under vacuum or is it something else?

[pep240sx]

I hooked up my vacupump and read idle vacuum of 18 mm Hg, so I think the problem is in the boost gauge. I can get a reading off of the same line. I wonder what would cause this problem. It still reads boost, just not vacuum

[rps13_fastback]

Originally Posted by pep240sx

I hooked up my vacupump and read idle vacuum of 18 mm Hg, so I think the problem is in the boost gauge. I can get a reading off of the same line. I wonder what would cause this problem. It still reads boost, just not vacuum

i'm willing to put money on it that it's your boost gauge. what kind is it?

[sr240mike]

Mine did that when the line was kinked. Only under boost did it straighten out and read on the gauge.

[pep240sx]

Yep. It's the gauge. I removed it and hooked my vacuum pump to it and it wouldn't go below 0 psi. Then I noticed I could move the needle around by spinning one of the machine screws that was loose.

Autometer fails again