Quote:
Originally Posted by Thom IV
Need some advice and things to check for.
My 31 Rdstr isn't running well. Lack of throttle response, backfiring through the carb. Necessary to have GAV open almost a full turn in order to get engine to run smooth. Last time I drove it best speed was 35 MPG with throttle to the floor. Starts good. What should I be checking?
Thanks in Advance for your thoughts
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You have a massive vacuum leak, probably at the intake to block gasket. This will require truing the manifolds and intalling a new gasket. The symptoms are classic, starts good and idles fine. Will not rev up or make power. GAV must be opened to compensate for unwanted air. Could also be caused by a warped flange on the tillotson carb or a cracked intake manifold. An intake valve stuck open will cause similar problems but usually be hard starting also.
Rainmaker Ron