Carb and dizzy
Thread Starter
Instructor
Joined: Mar 2014
Posts: 104
Likes: 0
From: Frankfort IL
Carb and dizzy
Hey all, am I right in assuming that this is the stock carb and dizzy? So I am assuming that the engine has had the emissions stuff removed, but I think this is still computer controlled. In the second photo is that a vac advance on the dizzy? I thought these were on ly electronic? Anyone else help out? Thanks in advance
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Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
The sticker on the back left side of the carburetor indicates it's been rebuilt at sometime... what are the casting numbers? (just a bit forward of that sticker, 8 digit number that starts with 170)
They are certainly are correct appearing at a "zoomed-out" view. That's an E4ME Quadrajet (TPS sensor just forward of the throttle bracket).
They are certainly are correct appearing at a "zoomed-out" view. That's an E4ME Quadrajet (TPS sensor just forward of the throttle bracket).
Pro
Joined: Nov 2012
Posts: 672
Likes: 0
From: Chesapeake Virginia
it's hard to tell what year car you have BUT something isn't right, either the carb is wrong or the dist. is wrong. you have a computer controlled carb and a NON-computer controlled dist. depending on the car, one or the other won't work correctly. it looks like you have the wiring for the carb so I'm betting someone replaced the dist. with a cheaper and more available NON computer version, the engine will run but not very well.
Race Director
Joined: Oct 2000
Posts: 12,682
Likes: 3,134
From: Shamong, NJ
Why is it that so many people come on here, looking for help or information, and refuse to tell us what year car they have, or are working on???? Just saying "I have a C3", isn't much better either. 
Okay, I'm sorry, my rant's over.
Based on the pictures, and the part number on the carb, I'm guessing that the OP has an 81.
By 1981, Chevrolet was using bar codes, to identify parts and part numbers. There are actually, quite a few bar coded labels, on 81 Corvettes.
If something has been changed, it looks like it's the distributor.
Thread Starter
Instructor
Joined: Mar 2014
Posts: 104
Likes: 0
From: Frankfort IL
The sticker on the back left side of the carburetor indicates it's been rebuilt at sometime... what are the casting numbers? (just a bit forward of that sticker, 8 digit number that starts with 170)
They are certainly are correct appearing at a "zoomed-out" view. That's an E4ME Quadrajet (TPS sensor just forward of the throttle bracket).
They are certainly are correct appearing at a "zoomed-out" view. That's an E4ME Quadrajet (TPS sensor just forward of the throttle bracket).
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Thread Starter
Instructor
Joined: Mar 2014
Posts: 104
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From: Frankfort IL
This is a 1981 numbers matching. Engine has been bored. 30 over, after market cam. Not sure of other work done except obviously the Pistons etc. That's what I was able to find with the PO paperwork.
Thread Starter
Instructor
Joined: Mar 2014
Posts: 104
Likes: 0
From: Frankfort IL
it's hard to tell what year car you have BUT something isn't right, either the carb is wrong or the dist. is wrong. you have a computer controlled carb and a NON-computer controlled dist. depending on the car, one or the other won't work correctly. it looks like you have the wiring for the carb so I'm betting someone replaced the dist. with a cheaper and more available NON computer version, the engine will run but not very well.
Race Director
Joined: Jan 2000
Posts: 12,399
Likes: 247
From: San Jose CA
I don't believe that it is a rebuilt carb. I have an 81 I bought new, and it has the exact same sticker on it, and I've never had the carb off of the car. The last 4 digits of the 81 carb, are 1228, just like on that sticker.
By 1981, Chevrolet was using bar codes, to identify parts and part numbers. There are actually, quite a few bar coded labels, on 81 Corvettes.
If something has been changed, it looks like it's the distributor.
Burning Brakes
Joined: Nov 2013
Posts: 889
Likes: 13
From: Jax/St. Augustine FL
This is an 81. That's what was throwing me off about this car. Everything I've read here said there should be a computer controlled dizzy. Yet when I looked it seemed to have a vac advanced. Do you think I should try to find a computer controlled dizzy for this? I'm rebuilding the carb soon (waiting for cliffs book to arrive) and want to get the best performance. Seems the area quite a few people who believe the computer controlled can work just as well as one that isn't computer controlled. Easier to just replace the dizzy? Thanks for the help everyone! I was told this is a pretty solid runner and I'm sure getting it set up correctly would help
Thread Starter
Instructor
Joined: Mar 2014
Posts: 104
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From: Frankfort IL
From the image I see your dizzy has the correct electrical pigtail but someone put in on a vacuum advance dizzy....If no check engine light then the dizzy is giving input to the ECM, but not accurately. The ignition module for our 81's is a 7 pin not a 4. This is due to the eclectical pigtail. I had same exact issue as you . I got an ordinal 81 dizzy for a vette off eBay for 29 bucks !!! If I were you I woul get to searching *if* you want your 81 to be under the CCC controls. I love how mine runs now that I have the CCC in charge
Burning Brakes
Joined: Nov 2013
Posts: 889
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From: Jax/St. Augustine FL
That being the case I posted this last month, you may find it very helpful
http://forums.corvetteforum.com/c3-t...ol-manual.html
http://forums.corvetteforum.com/c3-t...ol-manual.html
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From: New Or-leens Loo-z-anna
Le Mans Master
Joined: Feb 2011
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From: Southern NH
it's hard to tell what year car you have BUT something isn't right, either the carb is wrong or the dist. is wrong. you have a computer controlled carb and a NON-computer controlled dist. depending on the car, one or the other won't work correctly. it looks like you have the wiring for the carb so I'm betting someone replaced the dist. with a cheaper and more available NON computer version, the engine will run but not very well.