C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

Engine Hiccup

Thread Tools
 
Search this Thread
 
Old Mar 21, 2012 | 09:15 PM
  #1  
czardali's Avatar
czardali
Thread Starter
Instructor
10 Year Member
 
Joined: Mar 2010
Posts: 219
Likes: 0
From: Texas
Default Engine Hiccup

It started with me tinkering with my carburetor. It had a hard idle and with some adjustments my car didn't idle hard anymore however now my car does this rumble when I turn it off and its not all the time either. Its usually after the first run of the day and the rest of the day its fine with it doing a violent shake every now and then. I am thinking I need a new carburetor. Now fluids shoot out nothing the car just shakes.
Reply
Old Mar 22, 2012 | 03:46 PM
  #2  
MelWff's Avatar
MelWff
Race Director
15 Year Member
Liked
Loved
Community Favorite
 
Joined: May 2006
Posts: 18,503
Likes: 2,498
Default

how high is your idle speed, sounds like you are describing runon
Reply
Old Mar 22, 2012 | 04:36 PM
  #3  
Mashman's Avatar
Mashman
Melting Slicks
10 Year Member
 
Joined: Mar 2008
Posts: 2,023
Likes: 6
From: Austin Tx
Default

Originally Posted by MelWff
how high is your idle speed, sounds like you are describing runon


I would guess it's a timing issue - what is your initial timing set at? You might want to retard it a bit.
Reply
Old Mar 23, 2012 | 10:01 AM
  #4  
czardali's Avatar
czardali
Thread Starter
Instructor
10 Year Member
 
Joined: Mar 2010
Posts: 219
Likes: 0
From: Texas
Default

im barely idling at 1000rpm. What sucks about this is that it comes and goes. It usualy gives me a violent shake after my first run of the day and then stops.
Reply
Old Mar 23, 2012 | 07:57 PM
  #5  
scottw's Avatar
scottw
Burning Brakes
20 Year Member
 
Joined: Oct 2001
Posts: 1,241
Likes: 4
From: Okinawa Okinawa
Default

1000 idle seems a little high. Mine is about 800-850. Do you have your timing set for initial or all in by 28-3200?
Reply
Old Mar 25, 2012 | 12:58 PM
  #6  
czardali's Avatar
czardali
Thread Starter
Instructor
10 Year Member
 
Joined: Mar 2010
Posts: 219
Likes: 0
From: Texas
Default

I adjusted my carb and my car has weak startups and low power. I find myself pumping the pedal to get her started. The car acts like it wants to die especially when i put it in reverse. I didn't have any of these problems until i messed with my carb a week ago.
Reply
Old Mar 25, 2012 | 01:06 PM
  #7  
cv67's Avatar
cv67
Team Owner
15 Year Member
 
Joined: Oct 2004
Posts: 81,242
Likes: 3,061
From: altered state
St. Jude Donor '05
Default

What did you adjust on the carb

Whats the list #

Its stamped on the front of the air horn
Looks something like this

Reply
Old Mar 25, 2012 | 01:29 PM
  #8  
czardali's Avatar
czardali
Thread Starter
Instructor
10 Year Member
 
Joined: Mar 2010
Posts: 219
Likes: 0
From: Texas
Default

i adjusted the idle mixture screw. I touched one of the front screws but barely. I adjusted the screw again and my diesling gets worse, i put it down and my power is so low the car wants to die. I cant find a happy medium.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)

 Joe Kucinski
story-1

Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!

 Michael S. Palmer
story-2

5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!

 Joe Kucinski
story-3

7 Bolt-On Upgrades From Extreme Online Store to Level Up Your C6 Corvette

 Pouria Savadkouei
story-4

How Likely Are These Five 2027 Corvette Rumors to Be True?

 Brett Foote
story-5

9 Best Corvettes You Can Buy for Half Price (& 1 You Should NEVER Buy!)

 Joe Kucinski
story-6

8 Very Best Corvettes of Amelia Island 2026

 Joe Kucinski
story-7

Top 10 WORST Corvette Engineering Failures of All Time!

 Joe Kucinski
story-8

10 Records the C8 Corvette Generation Has SMASHED (& 1 Glaring Failure)

 Joe Kucinski
story-9

7 Wildest Corvette Concepts Ever Made

 Brett Foote
Old Mar 25, 2012 | 03:54 PM
  #9  
gcusmano74's Avatar
gcusmano74
Drifting
 
Joined: Mar 2011
Posts: 1,886
Likes: 9
Default

What year, and what carburetor? How many miles since a tuneup?
You may have to go back to square one, and set the engine up by the book and to the specs: both distributor and carburetor.
Reply
Old Mar 25, 2012 | 04:35 PM
  #10  
czardali's Avatar
czardali
Thread Starter
Instructor
10 Year Member
 
Joined: Mar 2010
Posts: 219
Likes: 0
From: Texas
Default

i got the carb three years ago. performer series edelbrock 1400 series. i havent changed my spark plugs in a year. im going to change the spark plugs first and then get ready for a new carb.
Reply
Old Mar 26, 2012 | 03:51 AM
  #11  
Iron_dog's Avatar
Iron_dog
Racer
10 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Apr 2011
Posts: 471
Likes: 3
Default

Originally Posted by czardali
i got the carb three years ago. performer series edelbrock 1400 series. i havent changed my spark plugs in a year. im going to change the spark plugs first and then get ready for a new carb.
As Lars says, 90% carb problems are ignition problems...
Have you checked timing?
Reply
Old Mar 26, 2012 | 09:24 AM
  #12  
czardali's Avatar
czardali
Thread Starter
Instructor
10 Year Member
 
Joined: Mar 2010
Posts: 219
Likes: 0
From: Texas
Default

I have no idea how to adjust my timing. i havent had a runon happen in days. very confusing. im guessing my order of repair is going to be spark plugs,timing, distributor and then i'll mess with the carb.
Reply
Old Mar 27, 2012 | 05:29 AM
  #13  
Iron_dog's Avatar
Iron_dog
Racer
10 Year Member
Conversation Starter
All Eyes On Me
Liked
 
Joined: Apr 2011
Posts: 471
Likes: 3
Default

Originally Posted by czardali
I have no idea how to adjust my timing. i havent had a runon happen in days. very confusing. im guessing my order of repair is going to be spark plugs,timing, distributor and then i'll mess with the carb.
Buy a timing light (with dial-back is better) and a vacuum gauge is mandatory in order to diagnose these "old style" cars. My 2 cents...
Reply
Old Mar 27, 2012 | 04:58 PM
  #14  
czardali's Avatar
czardali
Thread Starter
Instructor
10 Year Member
 
Joined: Mar 2010
Posts: 219
Likes: 0
From: Texas
Default

oh man this timing thing seems mighty important... im up for it.
Reply

Get notified of new replies

To Engine Hiccup





All times are GMT -4. The time now is 06:11 AM.

story-0
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)

Slideshow: Every Corvette Grand Sport explained

By Joe Kucinski | 2026-03-26 07:13:44


VIEW MORE
story-1
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!

Slideshow: Breaking down the 2027 Grand Sport, Grand Sport X, Stingray, and LS6 V8.

By Michael S. Palmer | 2026-03-26 13:48:45


VIEW MORE
story-2
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!

Slideshow: 5 reasons bad drivers crash sports cars & 5 ways to avoid a costly shame!

By Joe Kucinski | 2026-03-25 16:32:55


VIEW MORE
story-3
7 Bolt-On Upgrades From Extreme Online Store to Level Up Your C6 Corvette

Slideshow: Check out these easy-to-install upgrades from Extreme Online Store that reshape the look and feel of the C6 Corvette.

By Pouria Savadkouei | 2026-03-23 17:00:27


VIEW MORE
story-4
How Likely Are These Five 2027 Corvette Rumors to Be True?

There may be some big changes on the horizon.

By Brett Foote | 2026-03-18 06:55:42


VIEW MORE
story-5
9 Best Corvettes You Can Buy for Half Price (& 1 You Should NEVER Buy!)

Slideshow: 9 best Corvettes you can buy for half price (and 1 you shouldn't!)

By Joe Kucinski | 2026-03-17 10:20:26


VIEW MORE
story-6
8 Very Best Corvettes of Amelia Island 2026

Slideshow: 8 best Corvette of Amelia Island 2026

By Joe Kucinski | 2026-03-11 09:28:52


VIEW MORE
story-7
Top 10 WORST Corvette Engineering Failures of All Time!

Slideshow: Top 10 worst Corvette engineering failures

By Joe Kucinski | 2026-03-10 17:38:03


VIEW MORE
story-8
10 Records the C8 Corvette Generation Has SMASHED (& 1 Glaring Failure)

Slideshow: 10 records the C8 Corvette generation has SMASHED (& 1 glaring failure).

By Joe Kucinski | 2026-03-02 11:16:36


VIEW MORE
story-9
7 Wildest Corvette Concepts Ever Made

Out of the many Corvette concepts that exist, these are by far the wildest of the bunch.

By Brett Foote | 2026-03-02 11:03:54


VIEW MORE