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

Used QJet first startup problems

Thread Tools
 
Search this Thread
 
Old Mar 7, 2008 | 01:48 PM
  #1  
Ak. Mal's Avatar
Ak. Mal
Thread Starter
Race Director
10 Year Member
 
Joined: Oct 2000
Posts: 11,891
Likes: 3
From: Kansas City, MO ...I'd like to go fishing and catch a fishstick. That'd be convenient. - Mitch Hedberg
Default Used QJet first startup problems

I recently purchased a used Qjet. Supposed to have come off of a running engine. Was in a large sealed bag when I got it. It stayed that way for about 3 weeks while I put on the new intake. Last night I installed it and hooked everything up. I fired up the car and it immediately revved up to 2k and then worked up to 3k rpms. I tightened the throttle return springs to make sure throttle was returning fully. I made sure the idle screw was far enough back to ensure it wasn't keeping the engine turning that high. I advanced/retarded the distributor a little bit, but nothing could stop it from running at that RPM. After several attempts the choke block off plate was starting to open, but I had to quit for the night.

I could use some guidance on where to start looking for the problem.

Oh, one other thing, after running the car for a bit, the black gasket that sticks out between the top plate of the carb and the main body appeared damp.
Reply
Old Mar 7, 2008 | 01:59 PM
  #2  
tommyleea's Avatar
tommyleea
Racer
 
Joined: Apr 2006
Posts: 340
Likes: 0
From: Warrensburg MO
Default

Used will probably run, but need a fresh rebuild. Sounds like your choke is closed, and you need some fast idle/choke adjustment. Cheers.

Tommy
Reply
Old Mar 7, 2008 | 02:03 PM
  #3  
S489's Avatar
S489
Burning Brakes
 
Joined: Feb 2006
Posts: 1,024
Likes: 1
From: AL
Default

rear throttle blade may be stuck open slightly, but . . . take it all apart and rebuid it
Reply
Old Mar 7, 2008 | 02:10 PM
  #4  
Ak. Mal's Avatar
Ak. Mal
Thread Starter
Race Director
10 Year Member
 
Joined: Oct 2000
Posts: 11,891
Likes: 3
From: Kansas City, MO ...I'd like to go fishing and catch a fishstick. That'd be convenient. - Mitch Hedberg
Default

I purchased the Rochester Carb books by Cliff Ruggles and Doug Roe right after I bought the carb. I'm still not sure if I think I can do the carb rebuild or not. I haven't read the books completely, more like skimmed through them. I also contacted Lars about his pricing. Looks like I might need to contact him about when he can fit mine in.
Reply
Old Mar 7, 2008 | 02:15 PM
  #5  
Jud Chapin's Avatar
Jud Chapin
Race Director
Supporting Lifetime
20 Year Member
St. Jude 15 Year Donor
Liked
Community Favorite
 
Joined: Sep 2001
Posts: 10,560
Likes: 439
From: Wellington, FL
St. Jude Donor '11 thru '25
Default

Originally Posted by Ak. Mal
I purchased the Rochester Carb books by Cliff Ruggles and Doug Roe right after I bought the carb. I'm still not sure if I think I can do the carb rebuild or not. I haven't read the books completely, more like skimmed through them. I also contacted Lars about his pricing. Looks like I might need to contact him about when he can fit mine in.
I used Doug Roe's book to rebuild my Q-jet and it came out fine, much to my amazement I might add. However, since you know nothing about the history of your carb, it might be better to have Lars look at it.

Last edited by Jud Chapin; Mar 7, 2008 at 02:29 PM.
Reply
Old Mar 7, 2008 | 02:24 PM
  #6  
The_Dude's Avatar
The_Dude
Team Owner
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Jul 2001
Posts: 61,415
Likes: 478
From: Here to make friends
St. Jude Donor '11, '16-'17
Default

I would just send it to Lars. Someone else may have had it apart and not put it back together correctly, or with the correct parts. You could spend a lot of time tearing your hair out over this. Lars checks this stuff as a part of his rebuild process, so what you get back will be correct. It's well worth much more than he charges.
Reply
Old Mar 7, 2008 | 02:35 PM
  #7  
DRIVESHAFT's Avatar
DRIVESHAFT
Drifting
20 Year Member
 
Joined: Aug 2005
Posts: 1,682
Likes: 3
From: League City TX
Default

If the choke wasnt open yet, you were still on the fast idle cam.
Its normal operation. When the choke opens the idle speed will drop.
Reply
Old Mar 7, 2008 | 03:01 PM
  #8  
langlj00's Avatar
langlj00
Instructor
 
Joined: Jun 2005
Posts: 140
Likes: 0
From: Bovingdon Hertfordshire
Default

Not sure if your choke was off or not.
There is an adjustment screw (passenger side) in amoungst the choke mechanism that you can turn the choke fast idle down with.

If the choke was fully off - then you have a vacuum leak. Either at the intake manifold or past the primaries or secondaries. - Were they open ?

Jeremy.
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 Mar 7, 2008 | 03:42 PM
  #9  
RagTop69's Avatar
RagTop69
Melting Slicks
15 Year Member
 
Joined: Aug 2005
Posts: 2,821
Likes: 204
From: Lincoln CA
Default

Your Husky has "snow nose". So does mine. Comes and goes with the seasons. What's his or her name? How old? Mine will be seven this month and her name is Kiska. She weighs 65 lbs. and is 24.5" at the withers.

I'm going to speak to Ak. Mal in Husky now. Woooooo! Woooooo! Woooooo!
Reply
Old Mar 7, 2008 | 05:08 PM
  #10  
Ak. Mal's Avatar
Ak. Mal
Thread Starter
Race Director
10 Year Member
 
Joined: Oct 2000
Posts: 11,891
Likes: 3
From: Kansas City, MO ...I'd like to go fishing and catch a fishstick. That'd be convenient. - Mitch Hedberg
Default

I'll check the choke settings to see if everything is working. The numbers on the base of the carb works out as a 1976 Corvette. It has an electric choke, which I thought wasn't original for that year, but had to have been converted. I'm looking in one of my books and it makes reference to a screw on the choke pull-off that adjusts the angle of the choke-flap. I'll try to work with that, and I know that you can adjust the choke by rotating the black cover on the choke housing.



RagTop69 - Who would have guessed one sound could mean: I'm hungry, feed me now, let me outside and Hot Damn...let's play!! That's Molly in my avatar. She's an Alaskan Malamute and turns 8 on Sunday. I had only had her for a few months before registering here....that's where my username came from. She got her snow nose her first winter and it never went away.

Here is some useless trivia...(true or not ????) George Lucas grew up always having Malamutes in the household. That is the inspiration for the sounds Chewbacca makes in the Star Wars movies.
Reply

Get notified of new replies

To Used QJet first startup problems





All times are GMT -4. The time now is 08:27 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