I have a 99 gsr. I am missing a vacuum hose on top of my black canister to the top of my throttle body. I am using a LS throttle, it does not have the top connection to the canister so I just plug it up. Will this effect my horsepower?

 

No, however the evap emmissions system will not work and you will have a gas smell in the car. I teed mine off the suction for the MAP sensor, car runs, but I haven't figured out if it's gotten rid of the gas smell. The gas smell can be VERY noxious driving with the windows down for long periods of time, also your gas tank may leak when full.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CRX7 &raquo;</TD></TR><TR><TD CLASS="quote">No, however the evap emmissions system will not work and you will have a gas smell in the car. I teed mine off the suction for the MAP sensor, car runs, but I haven't figured out if it's gotten rid of the gas smell. The gas smell can be VERY noxious driving with the windows down for long periods of time, also your gas tank may leak when full.</TD></TR></TABLE>

are you sure it causes the gas tank to leak? i haven't had mine connected in god knows how long and it seems ok. can't really smell the gas fumes either, but i really dont pay attention

 

just to clarify, the hose going to the top of the throttle body is not vacuum, its simply a vent. if you dont have a vacuum line for it, just leave it be and it will vent to atmosphere

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91civicDXdude &raquo;</TD></TR><TR><TD CLASS="quote">just to clarify, the hose going to the top of the throttle body is not vacuum, its simply a vent. if you dont have a vacuum line for it, just leave it be and it will vent to atmosphere
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This is true. ^ That is where the throttle body sucks the remnant evaporative emissions from the charcoal canister.


Modified by rjay8604 at 2:30 AM 10/17/2005

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rjay8604 &raquo;</TD></TR><TR><TD CLASS="quote">This is true. ^ That is where the throttle body sucks the remnant evaporative emissions from the charcoal canister. Definitely plug the open vacuum port on the t-body now though. </TD></TR></TABLE>

its not vacuum as previously stated. it vents BEFORE the throttle plate. you dont have to plug it off

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CRX7 &raquo;</TD></TR><TR><TD CLASS="quote"> you will have a gas smell in the car. .</TD></TR></TABLE>


Yeah, I do notice a gas smell everytime I first start my car. I always thought it was my custom hose for my aem fuel filter. Thanks.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91civicDXdude &raquo;</TD></TR><TR><TD CLASS="quote">just to clarify, the hose going to the top of the throttle body is not vacuum, its simply a vent. if you don't have a vacuum line for it, just leave it be and it will vent to atmosphere
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To clarify, it's not a vent. It is ported vacuum. That means that at idle there is no vacuum. When the throttle plate is opened, then vacuum is present. The evaporative emissions (fuel vapor) are burned off during cruise conditions. You don't want the EVAP system operating at idle because there is the potential for the car to run too rich. Ported vacuum was used in the old days to operate EGR valves and other devices that the manufacturers did not want to operate at idle, before the advent of the complex electronic controls that we all enjoy now

 

Actually even though it "vents" before the throttle plate, when the throttle plate is open it still creates ported vaccuum of 1-4"HG maybe slightly more and the purge control solenoid only releases vapors from the charcoal canister at midthrottle cruise, well its supposed to anyway.