Help Diagnosing Vacuum Leak

[S4UCE]

Just seeing if anyone can point me in the right direction in my search for a vacuum leak.

Symptoms:

When I start the engine, it will hold usually anywhere from 10-17hg in vacuum (depending on how long it's been sitting). As I get onto the throttle and it moves towards zero, the number never climbs back up. For example, if it's sitting at 15hg and I give some gas and vacuum drops to 11hg, it does not climb back to 15 when I release and will stay at 11. This is true down to the 5-10hg range depending on the day. If I get into boost, it might settle immediately back to 6hg and then slowly climb back to 7 then 8 then 9.

Because of this I'm inclined to think it's a check valve or something of the sort. Has anybody else experienced this? I have done a visual inspection of vacuum lines, but do not have access to a smoke tester.

[vavJETTAw36]

You can make a smoke tester for cheap. Type diy into google or YouTube and you can find a couple people decent ideas.


Sent from my iPhone using Tapatalk

[axnjaksn]

check the lines to your boost gauge, make sure that's all good. if you leave it in gear and decelerate does the gauge peg into vacuum?? it should

[S4UCE]

check the lines to your boost gauge, make sure that's all good. if you leave it in gear and decelerate does the gauge peg into vacuum?? it should

It doesn't. Are you suggesting a kinked gauge line?

[Trb1]

Had this happen once. Partially melted the line going to the boost gauge.

[insomniacxp1]

Stuck throttle plate?