Today me and another car guy investigated the intermittant increase in rpm.
We used a automotive stethascope. Noise is coming from the bell housing area.
We think either the crank shaft bushing, the throw out bearing or clutch/pressure plate is binding and causing the idle to be restricted until the clutch is depressed.
Nothing is interfering with the throttle linkage.
On a test drive and at speed the transmission performs as normal.
Also checked motor and transmission mounts. No apparent movement of the engine when rpm is sharply increased.
So it looks to me like the transmision will have to come out. Once separated from the bell housing, new parts are sure to follow.
Record heat, 115 degrees, will shorten my work day.
Stay tuned.........
Jerry
1 1951 Chev Panel with a 350 small block, automatic tranny.
1 2004 Chev 2500 HD pickup... stock
1 1950 Chev 5 window pickup; 261 c.i. engine, 4 on the floor.
With lots of time and money, any Stovebolt can be restored.
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