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914 1.7 4 carbs- spitting gas and exhaust from carb?

so I bought this 914 today that runs kind of ruff. I decided to take of all air-filters and cylinder number 3 is spitting up air and fuel.
What could be the problem? All the other carbs are fine and on occasion the car will backfire.
I tried using the search with no luck, Someone please help.

I am new to carburator cars. Sorry.
Old 03-11-2007, 10:27 AM
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have you done a valve job?
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Old 03-11-2007, 12:03 PM
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valve job was done 1000 miles ago
Old 03-11-2007, 12:31 PM
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Also noticed that the gasket between the downtube and the carburator is wet. and is only wet on this one cylinder.
Old 03-11-2007, 12:38 PM
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Downtube == manifold? Or is it above the carb?

Spitting up air and fuel sounds a lot like a valve problem. Do a compression test and see if that cylinder has significantly worse numbers than the rest. If so, you've got some $$$ you're gonna have to spend.

Check for vacuum leaks, too. Carbs dislike 'em, not as much as L-jet does, but they definitely don't like 'em!!

--DD
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Old 03-11-2007, 05:08 PM
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the leak is in between the carb and the tube that goes into the engine (intake tube)
Old 03-11-2007, 05:54 PM
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An air leak there could cause backfires due to a lean condition. This is kind of like an air leak in a CIS system.
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Old 03-11-2007, 06:05 PM
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Quote:
Originally posted by tonyzp007
the leak is in between the carb and the tube that goes into the engine (intake tube)
That would be AKA the manifold. Definite leak there; definitely not good...

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Old 03-11-2007, 06:54 PM
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make sure you are not smoking a cigarette when you are leaning over the engine bay.
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Old 03-11-2007, 07:33 PM
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Start my tighting all the carb and MANIFOLD mounting bolts and nuts.
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Old 03-12-2007, 03:45 AM
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first. the intake studs require very little torque. the haynes calls for 4.35 lbs (don't know how correct that is) and the cb books wants 18. if you're using a cut washer under the nuts you're prob exceeding those #s. i use the same locking washers used on the cv joint bolts for the manifold studs and the carb to intake studs. tighten everything down in equal stepped increments.

a bit more info (what brand of carbs) and a couple of pictures will help us. you should buy the weber book published by CB performance and a syncronometer. you will need both.

k
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Old 03-28-2007, 07:59 AM
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Quote:
Originally posted by Brother
make sure you are not smoking a cigarette when you are leaning over the engine bay.
and have a fire extinguisher handy
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Old 03-28-2007, 03:31 PM
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So why hasn't anyone just told him to clean the idle jets.

GEEZ I just went through this today with a red 914.
3 of 4 jets were partially plugged.

Ran like a champ after some CARB TLC.
Old 03-31-2007, 05:59 PM
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