General Maintenance & Repairs Leaks | Squeaks | Clunks | Rattles | Grinds
Sponsored by:
Sponsored by: CARiD

Problem with dropping RPMS

Thread Tools
 
Search this Thread
 
Old Feb 21, 2007 | 12:41 AM
  #1  
clayton02LS1's Avatar
Thread Starter
On The Tree
 
Joined: Dec 2005
Posts: 126
Likes: 0
Default Problem with dropping RPMS

Sometimes my car will have a good clean start, other times it will go like this- I start it, and it will drop down to around 400 RPMS (barely running, lights dimm) then it will climb back to idle (around 900 RPMS) within 10 seconds. Tap the gas then it'll act like it wants to die again! Any suggestions as to the problem?
Reply
Old Feb 21, 2007 | 12:55 AM
  #2  
96slow6's Avatar
Launching!
 
Joined: Aug 2005
Posts: 231
Likes: 0
Default

Vaccum leak. I think your cars have an AIC. If so then that is another thought of the top of my head. Im an LT guy so?
Reply
Old Feb 21, 2007 | 08:33 AM
  #3  
Weezzer's Avatar
TECH Resident
 
Joined: Jan 2003
Posts: 937
Likes: 0
From: South Alabama
Default

Take the IAC valve off the TB and clean it with carb cleaner.
Reply
Old Feb 21, 2007 | 11:03 AM
  #4  
clayton02LS1's Avatar
Thread Starter
On The Tree
 
Joined: Dec 2005
Posts: 126
Likes: 0
Default

So this is nothing electric? If it helps there's also a noise that accompanies this. It sounds like a turbo on my car. Like when I get on the throttle it winds up, and when I get off the throttle, it winds down. Now that I think about it it does sound like a vaccuum problem.

Last edited by clayton02LS1; Feb 21, 2007 at 11:13 AM.
Reply
Old Feb 24, 2007 | 02:35 AM
  #5  
96slow6's Avatar
Launching!
 
Joined: Aug 2005
Posts: 231
Likes: 0
Default

What about your air filter? When is the last time you cleaned it?
Reply
Old Feb 26, 2007 | 06:28 PM
  #6  
Spink's Avatar
TECH Regular
15 Year Member
iTrader: (1)
 
Joined: Nov 2006
Posts: 498
Likes: 2
From: NW Ohio
Default

Originally Posted by Weezzer
Take the IAC valve off the TB and clean it with carb cleaner.
+1

Seems like eventually I have to do this on every car I've owned.
Reply
Old Feb 26, 2007 | 07:56 PM
  #7  
tasilver's Avatar
TECH Enthusiast
iTrader: (2)
 
Joined: Dec 2006
Posts: 696
Likes: 0
From: Gloucester VA
Default

newbie question. Where is the IAC at on the throttle body.
Reply
Old Feb 27, 2007 | 02:19 AM
  #8  
Shinji43's Avatar
Teching In
15 Year Member
iTrader: (1)
 
Joined: Mar 2005
Posts: 30
Likes: 0
From: Morrisville, PA
Default

If you are standing infront of the throttle body looking towards the engine. You will see it on the right side above the TPS, it has 2 Torx screws, and when you take it out it has a spring and cone shaped plunger inside it.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

 Brett Foote
story-1

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

 Pouria Savadkouei
story-2

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

 Verdad Gallardo
story-3

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-4

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-5

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-6

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-7

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-8

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-9

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo




All times are GMT -5. The time now is 10:48 PM.

story-0
6 Gifts Neither Your Dad Nor Grad Will Shove Into the 'Trinket Drawer'

Don't get dad new socks or a grill brush this year.

By Brett Foote | 2026-06-09 14:55:56


VIEW MORE
story-1
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-2
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-3
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-4
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-5
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-6
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-7
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-8
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-9
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE