low vaccum question

[DSM420REVAMP]

Is there any way that intake vaccum could be affected by degraded fuel?

 

[sleeper-eclipse]

no vacuum is a mechanical action that happens when the piston is moving down causing a low pressure when the throttle body is closed

 

[DSM420REVAMP]

OK. So chances are I just have a vac leak somewhere.
BTW, how should the vac gauge read when going from idle to about 2500RPM?

 

[Diamond Star Werks]

Depends on the amount of throttle you use. How,low,is low vacuum anyways?

 

[DSM420REVAMP]

About 10 inHg, however when I open the throttle up the vaccum drops. Is that norm on a non turbo?

 

[Diamond Star Werks]

My vacuum sits around 16 I would expect higher on an n/a but idk. Ill ask my brother later. But yes any car loses vacuum when opening throttle

 

[glowryder]

You have a vac leak. Stock beshould be ~18in hg.. when you give throttle, yes vac should go down (closer to 0). Build a boost leak tester, and put it where your filter is.. same prinicapl even tho your non turbo. Listen for the leak.

 

[DSM420REVAMP]

Ok. Thanks guys for the help.

 

[LeeSD1]

You should have 18-22inHg if you have a healthy motor. You probably have a vac leak. Check the pcv valve if it hasnt been replaced. Then all the hose connections to the intake manifold.

 

[DSM420REVAMP]

Ok I found out that I forgot to put a seal back on the map sens, I'm going to go through and put clamps on all the vac lines that I do have. Now on the valve cover there are two vac ports the drivers side port I just have a mini filter connected, however the one closest to the pass side normaly went to the intake man. That port is nonexistant on the new man so should I just plug that port?

This is how the set is so far.

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[Diamond Star Werks]

You can plug it but that filter on the side is just going to get oil soaked with a,turbo appl. You need to get a catch can and route your pcv system back into the intake.

 

[glowryder]

^This. And i suggest a Boomba 3/8 .25Psi check valve. The low cracking pressure makes them ideal for a "PCV" valve.

 

[DSM420REVAMP]

^This. And i suggest a Boomba 3/8 .25Psi check valve. The low cracking pressure makes them ideal for a "PCV" valve.

Is this a standard or aftermarket part? Also can I get one at like autozone or do I need to check a peticular site? Thanks again.