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Forums -> C3 Fuel, Emission Control, and Exhaust Systems
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7/15/10 1:50pm - Original Message: 'Rebuild Q-Jet or buy EB'
cknacke
Former Member
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Minnetrista, MN - USA

Vette(s):
1976 stock, 4 speed manual

Joined: 7/10/2010
Posts: 8

Drove a couple blocks this am and started missing, then engine shut off.  Restarted pretty quick, but went "in and out" of power.  It felt like a gas shortage.  I've been having issues with starting the 76 after sitting a day.. so I'm thinking it's carb time.

Love to hear thoughts on rebuilding or buying an EB. 
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7/15/10 4:23pm - Reply: 'Rebuild Q-Jet or buy EB'
Gunslinger
Former Member
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Frederick, MD - USA

Vette(s):
1969 convertible L71 427/435 4-speed black interior

Joined: 9/8/2003
Posts: 3398
Are you sure it's not a fuel delivery problem and not a carburetor problem?  It could be a weak fuel pump, a clogged fuel filter or fuel pickup in the tank, or vapor lock due to the heat.  You need to determine what the problem actually is before simply installing new parts.

Outside of fuel injection, there's nothing better than a properly setup and adjusted Q-jet for a street car.  The key is "properly setup and adjusted".  Not everyone can do that.  There should be no reason that if your carburetor is the problem, it can't be properly rebuilt.  Of course, eventually all carbs are beyond practical rebuilding, and that's when you should look for a replacement.

The advantages of having your own rebuilt is you know it fits...all the linkages and hoses have a place to fit and the fuel line connects without issue.  

If you do decide you want an Edelbrock carburetor, you would also have made an excellent choice...they're simple, easy to adjust and hold their adjustments.  The downside is you have to do some adapting to your linkages and cruise control connection (if your car has cruise), and you need to use Edelbrock's a/c kick-up solenoid if you have a/c...it runs somewhere near an added $100.

None of that is a big deal to do, but has to be done...and does add to the cost and makes installation a bit more complicated.

If you're still running the original intake manifold, give some consideration to a new, modern intake design.  Not absolutely necessary, but you will notice improvements in power and drivability.  Much depends on whether you have an L48 or L82.  This can be a slippery slope of modifications...each one leads to more, so be very sure of what is absolutely your problem and what's the best solution.


____________________________________
Poet...Mystic...Soldier of Fortune. As always...self-absorbed, adversarial, c o c k y and in general a malcontent.

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7/15/10 5:56pm - Reply: 'Rebuild Q-Jet or buy EB'
cknacke
Former Member
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Minnetrista, MN - USA

Vette(s):
1976 stock, 4 speed manual

Joined: 7/10/2010
Posts: 8
Thank GS, I changed the fuel filter 2 weeks back - but I'll check it out tonight and see if there is good flow to the carb.  If it's rebuildable (and needed), I'll go that route before buying a new carb.  Wanted to be sure the Q-Jet was worth the work.
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7/15/10 6:03pm - Reply: 'Rebuild Q-Jet or buy EB'
Gunslinger
Former Member
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Frederick, MD - USA

Vette(s):
1969 convertible L71 427/435 4-speed black interior

Joined: 9/8/2003
Posts: 3398
BTW - I neglected to say earlier, that if you do decide to go with an Edelbrock carburetor (or Demon or Holley), you will need to change intakes.  THe Q-jet is a spread-bore and the others are square bores and won't work on the stock intake without using an adapter, which creates clearance issues with the hood.

Holley does make a direct fit spread-bore carb, if you want to replace the original carb and keep the stock intake.  You would also have to either eliminate the EGR or get an adapter to relocate it slightly to clear the Holley.  


____________________________________
Poet...Mystic...Soldier of Fortune. As always...self-absorbed, adversarial, c o c k y and in general a malcontent.

Click image for larger pic
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