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Old May 21st, 2003, 06:47   #8
wjp01908
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Default RE: 340 DL CVT iregular running at stationair running

"parking lot wrecking" ? Whats that?

I would be a bit wary of increasing the idle speed to mask this problem. Difficulty changing gear shows that the clutch is engaging and will be wearing while stopped, while crashing the gears will do them no good in the long term. It must be doing some speed.

As you suggest the carb does have a seperate idle circuit that supplies fuel/air mixture to a point BELOW the throttle valve in the bottom of the carb. (At idle the valve is nearly closed and there is not enough vacumm to pull fuel through the main jets higher up - the choke creates extra vacumm and sucks extra fuel out of the main jets when closed).

This may be blocked suggesting a thorough carb clean is needed.It is not an especially complex carb to dismantle and you dont have to completely disassemble it. Do it off the car on a clean bench and use plenty of carb cleaner with a thin plastic tube to blow through the various passages

If the vacumm is low due to leaks etc. this will also result in poor fuel supply at this point. Though you have checked the pipes, there could be an internal fault in one of the various valves/ servos etc that is leaking air to the manifold. A check with a vacumm gauge should show whether this is the case (you can get fairly inexpensive ones that have coloured bands for good/poor as well as the numbers if you are not sure what they should be) Or you could check more simply by pulling each hose off the manifold in turn and blocking the hole with your finger. The one that is improved by this is the one that is leaking. It will then be a case of double checking the pipework to the item concerned or repairing or replacing the offending item. (cross your fingers it`s not the 4 way valve or other expensive bits!) It may also be worth checking that the inlet manifold nuts on the cylinder head are secure and that there is no leakage at the carb / manfold join.

Good luck

Will Plummer
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