stupid question
Thread Starter
TECH Enthusiast
iTrader: (20)
Joined: Nov 2003
Posts: 651
Likes: 0
From: north jersey
stupid question when i remove my oil filler cap while the car is idleing is a lot of air supposed to get sucked in there? same thing with my oil dip stick. i dont remember ever hearing it before.
i do have a checkvalve and i am also running a catch can between pcv hose and intake. but no pcv valve.
anyway when i put my hand over the oil filler i feel a strong suction.
i do have a checkvalve and i am also running a catch can between pcv hose and intake. but no pcv valve.
anyway when i put my hand over the oil filler i feel a strong suction.
Last edited by 99transamls1; Jun 15, 2005 at 06:51 PM.
blkz28spt, its not going to suck your hand up like a carburetor would, it'll be slow, like 10-15 secs with your hand against the oil fill port, you'll feel a slight, slight vacuum.
Thread Starter
TECH Enthusiast
iTrader: (20)
Joined: Nov 2003
Posts: 651
Likes: 0
From: north jersey
Originally Posted by slowpoke96z28
are you sure you have the right sized PCV valve? if its sucking enough for u to hear it clearly, that may be the problem. a too big PCV valve.
wierd.
another thing i noticed the plug that i put in on the t.b. was gone.(where the pcv hose used to hook up, now its on the ati inlet hat) fixed that
still same problem.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo Thread Starter
TECH Enthusiast
iTrader: (20)
Joined: Nov 2003
Posts: 651
Likes: 0
From: north jersey
Originally Posted by blkZ28spt
I checked. It is a slight vacuum. Nothing I'd ever be able to hear (especially over the noise my car makes). It is there though.
anybody else ever heard of this?
Samething here, I asked that same question ... in another thread
Mine is a 1998 Z... .. Noticed this when the car is idling.... at normal operating temperatures... and I open the oil cap .. The Car stumbles slightly ... You can hear a change in idle speed.
Then If I put my hand on the oil cap hole,
it creates a suction.. If I remove it it stops.... ( Changes in Idle Speed again)
Is this normal.. . Or Does this means BAD RINGS..??
My Brothers 99 Vette Does not do that.. I tried it on his..
( Had his car Idling ,then I proceeeded to take the oil cap off.
and his car did not stumble.)
Thanks
Mine is a 1998 Z... .. Noticed this when the car is idling.... at normal operating temperatures... and I open the oil cap .. The Car stumbles slightly ... You can hear a change in idle speed.
Then If I put my hand on the oil cap hole,
it creates a suction.. If I remove it it stops.... ( Changes in Idle Speed again)
Is this normal.. . Or Does this means BAD RINGS..??
My Brothers 99 Vette Does not do that.. I tried it on his..
( Had his car Idling ,then I proceeeded to take the oil cap off.
and his car did not stumble.)
Thanks
Originally Posted by Blown Ta
when i remove my oil filler cap while the car is idleing is a lot of air supposed to get sucked in there? same thing with my oil dip stick. i dont remember ever hearing it before.
i do have a checkvalve and i am also running a catch can between pcv hose and intake. but no pcv valve.
anyway when i put my hand over the oil filler i feel a strong suction.
i do have a checkvalve and i am also running a catch can between pcv hose and intake. but no pcv valve.
anyway when i put my hand over the oil filler i feel a strong suction.
Originally Posted by orangeapeel
Lol! Why is that?
I watched the true duals video in your sig. How much water was in them pipes man
It never stopped spitting!!!!! 
I Tried it in my 05 silverado... It did not do it either..
Could not hear a change in idle speed. ,
on the Z .. It definitely changes the idle speed .. ( As soon as
you release your hand it goes back to normal.
It creates a suction too.. If you leave your hand long enought.
Anymore Help Appreciated..
Could not hear a change in idle speed. ,
on the Z .. It definitely changes the idle speed .. ( As soon as
you release your hand it goes back to normal.
It creates a suction too.. If you leave your hand long enought.
Anymore Help Appreciated..
Originally Posted by z_driver1
I watched the true duals video in your sig. How much water was in them pipes man It never stopped spitting!!!!!
It never stopped spitting!!!!! worried about the Vaccum It creates
when I put my hand in the oil cap.. and why it stumbles too..
BTW... My PCV is stock...
It tends to ilde at at about 1000-1100. ( Manual)
Someone...
Can you all check to see if you all's car does this while idling
at normal operating temps
Check to see if stumbles or creates a vaccum with the oil cap off.
when I put my hand in the oil cap.. and why it stumbles too..
BTW... My PCV is stock...
It tends to ilde at at about 1000-1100. ( Manual)
Someone...
Can you all check to see if you all's car does this while idling
at normal operating temps
Check to see if stumbles or creates a vaccum with the oil cap off.
Last edited by WhiteMamba; Jul 24, 2006 at 02:37 AM.
We had the exact same problem eith my moms Buicj Park 3800 series 2. You take off the oil cap and the car idles erratic kinda and a lot of suction? In our case it was a small crack in the Intake manifold.