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Hesitation and ISV
My '90 200Q has a hesitation at part throttle (less than .7 Bar) when the engine
is at operating temperature. If I am driving at constant speed, the car feels
like a bucking horse. The hesitation is in a very rhythmic manner (about 1
every second) and feels like the engine has shut down. If I let off the gas or
give it more, the hesitation goes away. I have disconnected the ISV and the
problem is gone. The car idles very well with the ISV connected and not well
with it disconnected, so I don't think the ISV is the problem. I have cleaned
it, but that made no difference.
Does anyone know what might cause the ISV the apparently cycle at part throttle?
'90 200Q Avant