when i park the car in the afternoon at like 7 or 8pm.....ill go out to the car at 545am and start the car , it ill start but will pull real low vacuum like -12 , it gradually gets better as it gets warmer but the car has to be driven quite a while to be back to normal.....anyone else experience this?

 

I noticed the other week my vac was under 20 it was colder out.

 

it will eventually go to -20 at idel , but its wierd when its warming up from being cold , it will pull some real low vac....

 

my vacuum has been changing slightly recently as well...what are you guys pulling normally? I had been pulling about 23 inches or so at idle, now its around 21....i'll start paying more attention to it and check back...

 

well when I start my car and it idles at 1,500+ then I get low vaccum like 21-22, but once warmed up it's around 18-20. I think it's normal only because of the higher revs at idle due to the cold start and not so much the cold "air"

 

on cold starts / days i get about 15vac then goes normal at 20-21......
plus i have to warm the car up for 15 mins b 4 i drive it if not it runs liek shyt all day!

 

The fact that the forged pistons are more contracted (smaller) than factory ones until the engine warms up may have something to do with it, but I doubt it. My best guess is that the iacv is just letting quite a bit of air in to let it idle higher to warm up (ie choke). This is equivalent to opening the throttle slightly, which would lower the vacuum.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eastbay92cx &raquo;</TD></TR><TR><TD CLASS="quote">The fact that the forged pistons are more contracted (smaller) than factory ones until the engine warms up may have something to do with it, but I doubt it. My best guess is that the iacv is just letting quite a bit of air in to let it idle higher to warm up (ie choke). This is equivalent to opening the throttle slightly, which would lower the vacuum.</TD></TR></TABLE>

u knwo what that may be true with what you said in regards to the forged pistons....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Snoflake &raquo;</TD></TR><TR><TD CLASS="quote">on cold starts / days i get about 15vac then goes normal at 20-21......
plus i have to warm the car up for 15 mins b 4 i drive it if not it runs liek shyt all day! </TD></TR></TABLE>


word my mexican padre' im the same way.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hella_JDM &raquo;</TD></TR><TR><TD CLASS="quote">


word my mexican padre' im the same way.</TD></TR></TABLE>

yes my lil white red headed step child.....i hate that shyt...
but yea on cold starts my vac is low then goes up as it warms up!

LOL ill say it again

it GOES UP WHEN IT WARMS UP

 

ya mine does the same sheit....