help me before i loose my marbles!!!

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help me before i loose my marbles!!!

Post by buggler66 on Sat Jul 20, 2013 8:19 am

i have just finnished a fuel infected to carb transplant on a '79 super bug convertable. it starts up wonderfull, runs great till it warms up, then dies and wont idle to save it's life. i've adjusted the valves, the choke, set the carb, fixed all vac. hoses, set the timing, re-gapped the plugs, and i'm out of ideas. i've tried two different carbs too. it still revsgood but the rpms fall slow like it has a air leak somewhere but i can't find it. all i can think is that the carb itself has an air leak somewhere in the linkedge sleeves or something. any ideas? i'm going to shoot it with a shotgun pretty soon if this continues! save the bug!!! thanks for any ideas!!!
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buggler66
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Re: help me before i loose my marbles!!!

Post by MRJEL on Sat Jul 20, 2013 9:25 am

To hunt for vacuum leaks, spray around gasket and joint areas with carb cleaner NOT STARTING FLUID. If you hit a leak, you'll hear it!

Also, back the pilot jet out about 1/2 turn (the one right behind the accelerator pump) and see if that helps. If it does, it may need cleaning, or I have had to Loctite them in place a half turn out.

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Re: help me before i loose my marbles!!!

Post by type4revolution on Sat Jul 20, 2013 6:13 pm

X2 on the pilot jet people love to crank them down . Remove it clean it blast opening in carb with cleaner and compressed air blast and reinstall good luck / are you using an elec fuel pump
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Re: help me before i loose my marbles!!!

Post by Heinz57 on Sun Jul 21, 2013 6:32 pm

Next time you start the car, let it warm up and when it starts to die and not want to idle, try loosening the fuel cap or remove it to see if the tank vent is blocked which could cause a vapor lock issue.
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Re: help me before i loose my marbles!!!

Post by type4revolution on Sun Jul 21, 2013 8:10 pm

Also if someone closed off all the vent lines on the fuel tank that will do it too. If you pull cap and its under pressure then that's the problem. If it still has the original fuel injection tank make sure its hooked up to the outlet pipe
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Re: help me before i loose my marbles!!!

Post by buggler66 on Sat Jul 27, 2013 8:54 am

fixed it! it was sucking air in through the sleeve around the throttle link arm on both carbs i had. i had to get a new carb ($175 in jasper) and it purrs like a kitten.
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