Is this bad - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Forced Induction All questions and problems regarding Superchargers, Turbos, NOS, ZEX, intercoolers, water injection, etc.

Reply
 
 
 
Thread Tools Search this Thread
Old 11-15-2007, 01:07 AM   #1
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Aug 2007
Location: West Allis, WI
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
2tonessei is on a distinguished road
Default Is this bad

when I start my car my boost gauge doesnt sit at negitive 10 it sits at negitive 7. It stills goes in to boost just fine and still drives the same but the gauge dosent sit at negitive 10. Can someone tell me why its not going all the way back down. Thanks.
2tonessei is offline   Reply With Quote
Old 11-15-2007, 01:09 AM   #2
Junior Member
 
Join Date: Apr 2006
Location: Purgatory
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
Bonneville92V688 is on a distinguished road
Default

There is nothing wrong with it. Humidity, elevation, and the density of the air are all factors that can make it sit in different places.
Bonneville92V688 is offline   Reply With Quote
Old 11-15-2007, 01:13 AM   #3
Senior Member
Certified Car Nut
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default

It'* fine. A car'* IDLE needs vary depending on temps, plug conditions, and such. Say it gets any higher, then I'd worry a little about a problem.

Some run at -10, some a little above. Mine'* a little above, 8ish. Sometimes it goes to -10 at idle.

If it has changed, you can try spraying TB cleaner at/near vacuum lines and connections for the EGR. If the idle ever changes, it would show a vacuum leak. If the idle gets down below 1000 when warm, it wouldn't be a bad leak, but I'd look into fixing it anyway.
J Wikoff is offline   Reply With Quote
Old 11-16-2007, 03:33 AM   #4
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Aug 2007
Location: West Allis, WI
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
2tonessei is on a distinguished road
Default

Thanks for all the infomation. I dont think its a vacum leak cause today when I drove it it stayed at -10 just fine. Thanks again
2tonessei is offline   Reply With Quote
Old 11-16-2007, 08:46 AM   #5
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

Run a test with the car on high idle vs warmed up. In drive vs park. You should see a difference in the boost gauge.
BillBoost37 is offline   Reply With Quote
Old 11-19-2007, 03:04 PM   #6
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Aug 2007
Location: West Allis, WI
Posts: 18
Thanks: 0
Thanked 0 Times in 0 Posts
2tonessei is on a distinguished road
Default

in park it sits at -10. then when i put it into drive it goes up a little bit like -9 or -8.
2tonessei is offline   Reply With Quote
Old 11-19-2007, 03:12 PM   #7
Senior Member
Certified Car Nut
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default

Sounds fine.
J Wikoff is offline   Reply With Quote
Old 11-19-2007, 05:06 PM   #8
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

Perfectly normal
BillBoost37 is offline   Reply With Quote
Old 11-19-2007, 10:23 PM   #9
Junior Member
 
Join Date: Jun 2002
Posts: 0
Thanks: 0
Thanked 0 Times in 0 Posts
2000SilverBullet is on a distinguished road
Default

Quote:
Can someone tell me why its not going all the way back down.
When you are at idle, your rpm'* are slightly higher than when you put it into drive. At idle your TB will meter in a certain amount of air even though your throttle plates are closed. You will lose a bit of vacuum due to the engine slowing slightly but with the same amount of air metered in since the throttle plate is still closed.
As you open the throttle plates during acceleration the vacuum level with drop.
Closing the throttle at higher engine speeds will produce the maximum amount of vacuum.
2000SilverBullet is offline   Reply With Quote
Old 11-21-2007, 09:45 PM   #10
Senior Member
True Car Nut
 
Join Date: May 2003
Location: Holt, MI & Lima, OH
Posts: 3,022
Thanks: 0
Thanked 0 Times in 0 Posts
dbtk2 is on a distinguished road
Default

Quote:
Originally Posted by 2tonessei
Thanks for all the infomation. I dont think its a vacum leak cause today when I drove it it stayed at -10 just fine. Thanks again
Yeah its not supposed to sit at -10 all the time.

Just to make sure its working properly drive down the road at oh about 70-80mph, and let off the gas and drop the shifter down into 2nd. I bet it says -10 then....
dbtk2 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Bad, bad, bad, bad vibrations.... SilverSleeper8704 2000-2005 11 07-30-2010 06:42 AM
BAD one liners. Bad, really really bad, but still funny. BonnieBrougham Lounge 3 12-16-2004 06:38 PM
Bad bad news h1081dan Lounge 22 10-29-2003 12:54 AM
One Bad Bad Ride lash92ssei Your Ride: GM Pictures & Videos 12 08-19-2003 05:05 PM
SuperCharger Pulley...bad for supercharger...bad for mileage Mr Bean 1992-1999 9 02-20-2003 12:34 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 09:27 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.