aussiecowboy Posted June 5, 2015 Share Posted June 5, 2015 I have a 1935 Pontiac 6 cylinder with a W1 tagged as a 314S. This car was a barn find and hadn't been run since 1966. I got the car running without dramas including buying a kit and rebuilding the carb. It now starts fairly easily and feels good at low revs but in the mid and higher end of the rev range the car surges and bucks badly, pulling the choke on smooths it out again and it gets down the road quite well. I have pulled the carb down twice more and can't see anything wrong. Float is adjusted to 3/8" as per the factory manual and it doesn't have fuel inside the float as far as I can tell. I'm starting to think the main jet included with my kit is wrong and the metering rod is now way out of adjustment causing it to lean out. When I stripped the carb I was unable to remove the plug at the bottom of the accelerator pump passage, someone has glued it in place but the pump is delivering a good shot of fuel so I wasn't too concerned. It is also worth noting that the idle mixture screw can be turned all the way in without stalling the engine so I assume there is some leakage at the throttle shaft, but I wouldn't think it bad enough to lean the engine out that severely. Fuel pump isn't the issue, I installed an external pump running from a fuel can and it made no difference. Any advice here would be appreciated. I'd be happy to buy another kit if I can find one that is definitely correct and a metering rod gauge would be very handy indeed. I should mention that I'm in Australia. 1 Link to comment Share on other sites More sharing options...
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