Engine rpm not retruning to "idle" when throttle opened up
Hi all,
Sorry for not responding earlier.
Went out in the car today and put 50 miles on the clock. Got back to the garage to find the car was ticking over at 1050 rpm (connected up my tacho-strobe as rev counter reads approx twice actual rpm). Turned engine off then on and engine idles at a steady 750rm. Rev up to around 14-1500 rpm and idle returns to 750 rpm. However, take the revs above 1500 rpm and the idle returns to 1000 to 1100 rpm. Tried turning the engine on and off several times and the car always idles at 750 rpm after start up. Open up the throttle above 1500 rpm and the idle allways settles back to around 1000-1100rpm. Very repeatable.
Sprayed car cleaner around throttle shaft points and no change in rpm.
Tried waggling the shafts and disconnecting clamps and no perceptible movement.
Checked the carbs and both appear to be well balanced.
Checked the return springs and they seem to be returning everything correctly.
All very odd.
Any further ideas?
Phil
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