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

Car running weak when cold outside

Thread Tools
 
Search this Thread
 
Old Jul 28, 2022 | 12:36 PM
  #1  
Adamtnorris's Avatar
Adamtnorris
Thread Starter
Cruising
 
Joined: Apr 2021
Posts: 12
Likes: 0
Default Car running weak when cold outside

So I've noticed my car is not running like it should it runs weaker the colder the weather is and much better when warmer outside even when the engine temp is 180 f in both conditions I've never had this problem with any of my other cars normally its the opposite
the motors got a quadrajet on it for the carb im thinking it could be a carb issue but second opinions would be appreciated
Reply
Old Jul 28, 2022 | 01:09 PM
  #2  
wwiiavfan's Avatar
wwiiavfan
Drifting
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Oct 2020
Posts: 1,567
Likes: 576
From: Wisconsin
Default

Please define "weaker".
Running rough, as in rough idle or missing?
difficult to keep running without throttle input?
Poor acceleration, lack of power?
other???

Better definition of the problem will yield good suggestions from the very knowledgeable folks on here.
Reply
Old Jul 29, 2022 | 08:18 AM
  #3  
stingr69's Avatar
stingr69
Le Mans Master
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Mar 2004
Posts: 7,493
Likes: 1,502
From: Little Rock AR
Default

Is the heat riser valve working properly? Located at the exit of the passenger side exhaust manifold.
Reply
Old Aug 1, 2022 | 10:56 PM
  #4  
Adamtnorris's Avatar
Adamtnorris
Thread Starter
Cruising
 
Joined: Apr 2021
Posts: 12
Likes: 0
Default

By weak I mean when I stick it to the floor it doesn't wanna go it wants to stall but only sometimes like I said it is running much
better when it's hot out even when the motor is warmed up in both condition
Reply
Old Aug 2, 2022 | 07:48 AM
  #5  
REELAV8R's Avatar
REELAV8R
Le Mans Master
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Apr 2011
Posts: 6,284
Likes: 1,171
From: Hermosa
Default

Secondaries will not open until engine warms up.
choke is still partially closed as well perhaps.

Are you comparing it's performance to a fuel injected car?
the water temp does not necessarily reflect if the rest of the engine is warm or not yet.
Reply
Old Aug 2, 2022 | 05:19 PM
  #6  
calwldlife's Avatar
calwldlife
Team Owner
15 Year Member
Loved
Community Favorite
Top Answer: 1
 
Joined: Jan 2007
Posts: 53,648
Likes: 878
From: Southern Cal Ca
St. Jude Donor '22
Default

most things are mentioned.
does it have a "stutter" when light accel?
Reply
Old Aug 2, 2022 | 06:34 PM
  #7  
Adamtnorris's Avatar
Adamtnorris
Thread Starter
Cruising
 
Joined: Apr 2021
Posts: 12
Likes: 0
Default

The only stutter it's got is if I get on it pretty good when it's not warmed up all the way and it acts like it wants to loose fire for a sec
Reply
Old Aug 2, 2022 | 07:00 PM
  #8  
calwldlife's Avatar
calwldlife
Team Owner
15 Year Member
Loved
Community Favorite
Top Answer: 1
 
Joined: Jan 2007
Posts: 53,648
Likes: 878
From: Southern Cal Ca
St. Jude Donor '22
Default

choke?
mani heat from riser?
Has cold weather bothered it before?
summer now, where are you?
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-1

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-2

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-3

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-4

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-5

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-6

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-7

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-8

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-9

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
Old Aug 2, 2022 | 11:12 PM
  #9  
lars's Avatar
lars
Tech Contributor
Supporting Lifetime Gold
25 Year Member
Conversation Starter
Photogenic
Top Answer: 3
 
Joined: Aug 1999
Posts: 14,380
Likes: 6,390
From: At my Bar drinking and wrenching in Lafayette Colorado
Default

Have you blocked off the manifold heat riser crossover..?
Reply

Get notified of new replies

To Car running weak when cold outside





All times are GMT -4. The time now is 01:07 AM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE