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Old 02-27-2010, 05:01 PM
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403 Olds Carb

Hey guys , the rebuilded 403 olds is back in the car and running , but not very good ...
I have 10.2 compression and when I hit the throttle its running good , but when I let it run idle , the engine starts to shake a lot ...
I think my carb is not getting enough fuel at idle ?
It's an Edelbrock Performer Carburetor 750 cfm .
I can order an edelbrock performer calibration kit or is another brand of Carb a better choice ?
I also have my original carb from my 403 Olds , but I don't have an address here in Belgium where I can have that quadrajet rebuilded ...
What do I do ?
any advice on this ?
Can it be something else than the carb ?

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Last edited by TommyV_11; 02-28-2010 at 04:46 AM.
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Old 02-27-2010, 08:26 PM
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If it runs strong when revved, I doubt it's a lack of fuel.

Mixture, or idle speed, or timing, or vacuum leak.

I'm not a big fan of quadrajets, but they can be great if setup properly. Unless you're just dead set on another carb, don't give up on it yet. Check your basics.
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Old 02-28-2010, 09:08 AM
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Quote:
Originally Posted by TommyV_11
Hey guys , the rebuilded 403 olds is back in the car and running , but not very good ...
I have 10.2 compression and when I hit the throttle its running good , but when I let it run idle , the engine starts to shake a lot ...
I think my carb is not getting enough fuel at idle ?
It's an Edelbrock Performer Carburetor 750 cfm .
I can order an edelbrock performer calibration kit or is another brand of Carb a better choice ?
I also have my original carb from my 403 Olds , but I don't have an address here in Belgium where I can have that quadrajet rebuilded ...
What do I do ?
any advice on this ?
Can it be something else than the carb ?
Double check the basics. Be absolutely sure the plug wires are correct. I would suggest you use a vacuum gage and see if it shows a jiggling needle- which could be due to a leaking intake manifold gasket, a vacuum leak or a problem w/the valve sealing or valve spring- even a bent push rod. The vacuum gage can also come in handy for setting the idle mixture screws.

Look at everything that is attached to the intake or carb by a hose for any possible vacuum leakage.

The dist. cap in real good shape? Old ones can have carbon tracking under the cap that causes misfiring. Same thing w/old wires- especially if there run parallel to each other for a long distance.

What do the spark plugs look like? They can help tell you if the carb is set too rich or lean by their color.

Let us know what you find.
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Old 05-27-2010, 05:40 PM
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Ok guys , the problems are fixed , at least some of them ...
I took the car to speedshop and the placed some kind of isolation , a plate of 2 cm underneath the carb
I was running on fumes , because the carb was getting to hot .
So now I have been driving it for about 300 miles .
The car starts to sound ok , almost stalls a little at idle , but I love that !!! 750rpm grm grm grm
I can feel on the gas pedal that she has more power then before , but heres the thing :
10.2 compression but I don't feel it on the gaspedal ...
the transmission , 3speed TH350 , has an rpm limit of 4200 rpm in the 1st and 2nd gear !
With the modifications I did on the engine , she can now go to 6000 rpm max .
Do I need another transmission ?

Also a list of the parts today on the car :

- 403 Olds engine cleaned and bored .024
- Keith Black hypereutectic flat top pistons KB405024
- Mondello SG-490 Halo support girdle with ARP main studs
- Mondello forged steel crankshaft
- Mondello forged steel flexplate
- Mondello forged steel connecting rods
- Mondello WT-195 Crankshaft Windage Tray
- Mondello hydraulic camshaft - JM-22-25-10 intake lift : 0.512 , exhaust lift : 0.523 adv. int/Exh Duration 274/280
- Mondello rocker set / kit
- Edelbrock timing chain 7813 dual roller
- PFS-80022 Harmonic balancer
- B&M Torque converter bmm 20412
- Edelbrock Valve springs 5812
- Edelbrock Intake Performer Manifold 2711
- Edelbrock performer Carburator 750 cfm ( Summit partnumber 1407 )
- Hooker supercompetition headers 3107-1HKR
- Pypes performance exhaust SGF70Race Pro dual exhaust , header back , stainless steel , X-pipe

Is there a part in this list thats holding back power on my engine ?
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Old 05-27-2010, 08:21 PM
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A B&M Transpak #30228 will allow you to hold first to any speed and can be installed by just dropping the pan and valve body- the tranny can stay in the car.

Sounds like a real nice set-up you have there. What heads are you running?
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Old 05-27-2010, 08:34 PM
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B&M also sells a governor recalibration kit(#20248) that has all the different weights and springs to allow you to set the governor up to shift at WOT at any rpm you wish, just takes a little trial and error(road testing) on finding the right combo to suit what you want.
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Old 05-28-2010, 05:34 PM
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Thanks on the info about the shifter , maybe I'll use the towing gears for a while ...
I'm using my original 4A heads , because I've read that they work well with the keith black pistons .
I have 10.2 compression , should be enough I think for that 403 olds engine !
I wonder how much horsepower and torque she has now .
I just think and feel that the engine is holding back and doesnt run smooth !
Another problem I have are the brakes !!!
Ever since I put the engine back in the car , the brakes has become very weak , so I put in a new brake booster , master cylinder and all new brake lines ! and nothing ! I have no pressure on the brake pedal , only brakes when my foot is almost on the floor ...
I took the ear out of the lines 3 times already , last time no air was coming out of the brakelines !
Any advice on this ?
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