Possible throttle body issue?

[Grizbomb1684]

I used the taboo diagram to route my vac lines

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Now I hooked my aftermarket boost gauge up the port p on throttle
Body and get a zero reading for vac but does read boost, I have swapped the line directly to intake manifold and reads around 16vac, is there a check valve on the port that stops it from reading vac or do I possible have a bad throttle body also my throttle body appears to only have 1 port on it for vac on the top Is there anyway to test just the throttle body for leaks?

 

[sciondan]

If you want to read vacuum and boost, you source needs to be behind the throttle plate. If you put it in front of the throttle plate it will only read boost. So to answer your question nothing is wrong with your throttle body. Tee the gauge in to the fuel pressure solenoid line like it shows and ignore the dotted line.

 

[Grizbomb1684]

If you want to read vacuum and boost, you source needs to be behind the throttle plate. If you put it in front of the throttle plate it will only read boost. So to answer your question nothing is wrong with your throttle body. Tee the gauge in to the fuel pressure solenoid line like it shows and ignore the dotted line.

So what u are saying is port P on the throttle body does not read vacuum and would only show boost?

 

[Dert]

I had my boost gauge T'd into the "P" line of the throttle body with no issues at all, read boost and vac just fine. I have since moved it to the FPS line tho due to change in set up, but it will work fine off the P line.

 

[Grizbomb1684]

My port P has no vac at it if the car idles and u pull the hose off it and put ## finger on it nothing but with it hooked up and driving it will read boost or 0 never pulls a vac plus the car idles like shit, is the a write up or anything to inspect throttle body for bad seals or how to re-condition them?

 

[snowborder714]

Doing a boost leak test will show you if you have any leaks at the throttle body (or anywhere else in the system).

Here's two articles on how to replace the shaft seals.
TB Shaft Seals VFAQ
Throttle Body O-Ring

 

[Grizbomb1684]

Doing a boost leak test will show you if you have any leaks at the throttle body (or anywhere else in the system).

Here's two articles on how to replace the shaft seals.
TB Shaft Seals VFAQ
Throttle Body O-Ring

Thank you

 

[Grizbomb1684]

Did the boost leak test and my injector seal was bad, ordered new orings and then a retest should be last of my issues thank you everyone for ## help,