Any D Jet experts in Seattle? Options

[Robson51]

Looking for some help from an in person human being before going to Webers.

Anyone out in Seattle (actually just north) that wants to make some side money?

TIA

[rjames]

@Rand Correct me if I'm wrong, but I don't think the engine would run at all if the hose to the MPS is disconnected, with or without plugging the hose.
Not trying to be an ass, just want to understand what could be learned from removing the hose to the MPS in this situation if the above is true. Seems akin to disconnecting the fuel pump while the engine is running to try and determine if there is an issue with the pump not delivering enough fuel.

I'm also betting that a rebuilt MPS that is properly calibrated for Robson51's engine will solve the issue. An MPS that only holds vacuum for a minute could cause all of the issues described.

[Rand]

@Rand Correct me if I'm wrong, but I don't think the engine would run at all if the hose to the MPS is disconnected, with or without plugging the hose.
Not trying to be an ass, just want to understand what could be learned from removing the hose to the MPS in this situation if the above is true. Seems akin to disconnecting the fuel pump while the engine is running to try and determine if there is an issue with the pump not delivering enough fuel.

I'm also betting that a rebuilt MPS that is properly calibrated for Robson51's engine will solve the issue. An MPS that only holds vacuum for a minute could cause all of the issues described.

Pulling the vacuum hose from the mps causes a full-rich scenario, like if the diaphragm wouldn't hold any vacuum (which is why that 2 second test would have said a lot if it didn't change things). Correct, it should not run (unless there was a major vacuum leak below the flap in the throttle body). I was just going off the phrase "won't hold a vacuum" before I learned it was over a minute. I guess the semantics hold vs. pull were key. Hopefully the replacement MPS does the trick.