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Hello,
I have a 75 280z that has been under restoration for several years. When I started the restoration, the car had triple weber dcoe with a canon intake manifold. The car ran well at the time, but now the engine bogs down anytime that the accelator is pressed. After the pedal is released and re-pushed, the car takes off after a few seconds. The timnig is set correctly, and the rotor, dist. cap, plugs and wires have all been changed.
Does anyone have any ideas?????


Jeff
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I have a set of triple webers on my car. I would just say that you should inspect the carbs for any obvious signs of deterioration (eg. fuel leakage around outer screws, or other dirtyness), and fix the problem. When I first got my car, It ran like crap with those carbs, I tried cleaning everything out and blowing everything I could out with the air compressor and nothing was working. I ended up just doing a complete overhaul, and found nothing obviously wrong other than a couple of gaskets that needed replacement. I even made new gaskets using the old ones as templates, because I didn't want to wait for an order to come in. I bolted everything back together and took great care to make sure that all the throttle angles were the same at Idle and set the idle mixture screws all at the same depth. It ran great! The carbs are actually pretty simple...hey are really easier to work on than say a four barrel holley except that there are three to do...it takes awhile to rebuild three but by the third one you are pretty good at it... have fun and good luck
 

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I sounds like fuel to air ratio, first look at the fuel delivery system, then check that the timing and varify that it is actually advancing during acceleration, check both the mechanical and the vaccum systems separatly. The intake and exhaust manifolds and the gasket must be free from cracks and all the hoses are in good condition. If this checks out then the last thing is rebuild. The accelerator pump maybe bad or a fuel jet is plugged, or a gasket is deteriated. The list could go on and on and on and on. During the rebuild process inspect the parts VERY carefully liking for anthing that looks BAD. I would take two apart at the same time keeping all the parts from the first separate from the other that way you can compare all three together looking for problems and have one fully assembled for reference. Never resuse old gaskets and seals... it never works out. Gas varnishes over time so it maybe somthing as simple as cleaning out the float bowls and reseting the correct float level. Good luck with the gremlins.
 

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I had a set of those once. It sounds like your accelerator jets might be clogged. I rebuilt mine. Before i rebuilt them, i could turn the throttle linkage and fuel would sprinkle out the jets. After cleaning the carbs out and taking compressed air to all the jets, the fuel squirted out the accelerator jets. Id recommend taking your carbs apart and cleaning them up, and possibly change your fuel filters.
 
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