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Way high idle with Nevada -98 after changing air filter

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s151669:
Changed air filter.

Now the thing idles at 3000rpm. Not good.

Spraying brake cleaner at things suggests that breathing system leaks here and there. But breather system is outside of the carburetor. Not like in vacuum side of the intake manifold. Basically this thing should run fine without any filter at all nevermind leaks in the breather. Or should it ?

Adding choke brings idle down -> lean condition.

Adjusting mixture screws brings idle down to 2000 rpm or so but then the screws are about to fall out.

No leaks at intake manifold.

What did I miss ? What is wrong with this thing ?

rocker59:

Probably an air leak.

Check the hose connections between the airbox and throttle bodies, and between the throttle bodies and the engine.

In my experience, it has been a problem with the hose connecting the throttle body to the engine.

s151669:

--- Quote from: rocker59 on July 22, 2024, 10:26:21 AM ---Probably an air leak.

Check the hose connections between the airbox and throttle bodies, and between the throttle bodies and the engine.

In my experience, it has been a problem with the hose connecting the throttle body to the engine.

--- End quote ---

Well, that is the most obvious culprit - yet it does not leak with brake cleaner test. Nor was it disturbed while changing the air filter.

And any air leak before carburettor should not cause any issues AFAIK.

Tkelly:
Throttle cable hanging up?

Dirk_S:

--- Quote from: Tkelly on July 22, 2024, 10:41:26 AM ---Throttle cable hanging up?

--- End quote ---

Related, but not necessarily the same—making sure the butterfly valve has the proper gap for idle?

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