TOFU.man

I am currently experecing some fluctuation in vacuum pressure,Most of the time it is at 20 in/hg and then others it ranges between 20in/Hg and 16in/Hg, It has never done this in the 2 years I have been boosting. Does anyone have an explination for this? The temp around here has been between 75 and 80 degrees when i am driving the car.

tgreaves

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B16AHondaSi &raquo;</TD></TR><TR><TD CLASS="quote">I am currently experecing some fluctuation in vacuum pressure, sometimes it is at 20 in/hg and then others it ranges between 16in/Hg, Does anyone have an explination for this? The temp around here has been between 75 and 80 degrees when i am driving the car. </TD></TR></TABLE>

Well there is a few reasons that I can think of for this.. Maybe your gauge isnt correct, always possible.. Is your motor warmed up when your doing this..
Also keep in mind, the amount of vacuum in the intake dictates the load on the motor.. In theory, if its hotter outside then the air is less dense so your motor will work a little harder to keep idle..

I might not be explaining this very well but if someone else wants to chime in then go ahead.. Im guessing that if your idle is normal then its nothing to worry about.. Thats my .02

TOFU.man

This only starts to occur after the car is warmed up.

tgreaves

And your idle's fine after its warmed up?

TOFU.man

Yep completely fine no problems at all, its just freak i dont know, it just started occuring in the past few weeks, Ill go to one stop light it will be at 20in/hg then i go to another and its at 18in/hg then back to 20 then somewhere else and so on then on somedays it just stays at 20 and doesnt change. I dont get it?

HYBRID_H@TCH

mine did the same thing..turned out to be a bad gauge.

drvfast

Mines also does that. Im not sure what is causing it though.

JonGP4

proably accessories running off vacume, IE, brakes, cruise, A/C.. and other things taking load from the motor.. Alternator, A/C, Power steering.. could be just something is drawing more load from the alternator.. or you brake booster is going out and using more/less vacume..

dunkd

mine does that too.... flucs between 17 and 20

TOFU.man

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JonGP4 &raquo;</TD></TR><TR><TD CLASS="quote">proably accessories running off vacume, IE, brakes, cruise, A/C.. and other things taking load from the motor.. Alternator, A/C, Power steering.. could be just something is drawing more load from the alternator.. or you brake booster is going out and using more/less vacume.. </TD></TR></TABLE>

I understand what you are saying here but i dont have a/c or power steering bc, i am runnin a JRSC and i wanted to loose all paralistic drag on the motor.

TOFU.man

bump