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Old 07-02-2011, 11:11 AM   #1 (permalink)
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weber on 258

Installed a Weber 32/36 K551 on my 258 CJ. It has a HEi conversion, no computer, headers and 2 " exhaust with flowmaster muffler, antipollution shit is all gone.

It starts very nice, idles nice at 800rpm, goes up and down on rpm nice if pressed progressively, but if I smash the peddle, it dies. I can restart it without a problem, comes back to idle quick but dies again if I press too hard on gas.

Any clues?

Thanks
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Old 07-02-2011, 02:16 PM   #2 (permalink)
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Carb new or used? Did it sit for a while if used? With the engine off and coil wire unplugged; look into the carb while operating the accelerator. You should see a spray of fuel from the accelerator pump. If not, that's your problem.
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Old 07-03-2011, 05:47 AM   #3 (permalink)
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Carb is new. I'll test that and report back. But could someone explain how that helps if motor start well and run good if pressed softly?
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Old 07-03-2011, 05:57 AM   #4 (permalink)
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The accelerator pump gives an added spray of fuel when the throttle is opened quickly to help compensate for the quick addition of more air into the motor.
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Old 07-03-2011, 06:33 AM   #5 (permalink)
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When you say coil wire unplugged...you mean from the HEI right???

I unplugged them, cycled threw the gas, and I dont get any fuel on right side of carb. Guessing it's the 36 part of the 32/36. Regular fuel is going to the left side.

I have a 3psi regulator on the line. but only single inlet for fuel, so how does the gas get to the second port? From same fuel line? or did I forget to plug something up?
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Old 07-03-2011, 08:11 PM   #6 (permalink)
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Anyone?????
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Old 07-03-2011, 10:04 PM   #7 (permalink)
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its a weber..... problem solved.....

buy an mc 2100 or 2150 and save yourself the aggravation..... lol

sounds like an accel pump prob... just in vase ots partially clogged jets.... try revving it up to 4 grand... then put your hand over the carb and choke it out.... sometimes you can get lucky and the extreme vacuum from choking it will clear out the jets...

thanks,
Mike ...
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Old 07-04-2011, 06:08 PM   #8 (permalink)
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can it get clogged if brand new???
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Old 07-04-2011, 07:50 PM   #9 (permalink)
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"new" doesnt always mean issue free.... ive bought lots of parts new and had to rebuild them or tweak them somehow...
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Old 07-04-2011, 07:59 PM   #10 (permalink)
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dist timing vaccum advance

Last edited by brownbagg; 07-04-2011 at 08:00 PM.
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Old 07-05-2011, 01:15 PM   #11 (permalink)
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x2, check your timing or pull the top off carb bowl and clean it good and make sure the floats and needle and seat are moving properly. my buddy and I have the same setup as you, same thing happened to him in MOAB this year. the floats on his got stuck kinda sideways in the bowl, start and run fine but as soon as he romped on it or went up a hill it died

everyone hates on webers but I think they are badass, never had any issues w/ mine
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Last edited by rebeljeeper; 07-05-2011 at 01:17 PM.
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Old 07-06-2011, 12:23 PM   #12 (permalink)
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Just spray carb cleaner in carg and should do the trick or more intense cleaning. Unit is new (I know it happens if new) never even taken on road as of yet. Been sitting in my garage since I installed it. Will re-check my timing.

Thanks

Last edited by sunset; 07-06-2011 at 12:23 PM.
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