Quote:
Originally Posted by ernbuild
Well tried a couple of things. First up could not get the engine to stall by blocking the throttles off as you suggested. In fact it made very little difference to the revs. Tried a few things to cut off air flow, including a rubber sheet a quarter inch thick. However was able to lower the idle by the adjusting screw right at the back of the mechanism that the cables attach to. Damned awkward, 8 mm nut on threaded rod with an allen key on the end to turn the screw. Managed to get it down to 900 to 1000rpm, but its still surging about 200 rpm. Its a lot better than it was but still has a vac leak by the sound of it. What do you reckon?? cheers Ern.  |
You are masking the issue when you adjust the set screw. That set screw was set by Rochester and MM never touched them when they assembled the motors.
By completely closing off the air intake, you eliminated any possibility that the TB was the issue. My guess is you have some leaks in around the fuel injectors at the injector housing.