TR3 with Buick V6

[Orange Alpine]

Greg, the engine starts fine when heat soaked.  It just does not want to do anything until temps A) come down, which would mean the air temperature compensation curve is wrong, or B) the air temp seen in the area of the air temp sensor is the same as the temp seen at the intake valves, don't have any idea how to fight that.  Don't know which choice is correct.  Maybe a little of both.  Fortunately, we do not have much of that kind of temperatures to deal with.  Maybe one or two times in a normal year.

A real advange of the EFI is the return fuel system automatically purges, so vapor lock is not a problem.  However, the newer cars use a "dead end" system and regulate fuel pressure with fuel pump speed.  Guys that use it with MegaSquirt  report it is a vapor lock headache.

Bill

[ghornbostel]

Bill, I run my cooling fan after shut down.  I have the same condition you describe and after the coolant makes one pass through the engine things calm down.  I believe there is a little bit of thermo siphon going on with the fan cooling the coolant that is in the radiator core after shut down.  I have a electric coolant pump from a VW that I am going to pull coolant out of the engine at the thermostat area and dump it into the radiator tank hoping that it will pull hot coolant from the engine and circulate it through the radiator and back to the engine after shut down along with the fan.  I'm just hoping that it won't short circuit.  Where I put the hose on the cross flow tank is probably going to be critical to some degree.  Vapor lock isn't a problem with my Webers but flooding is caused by the fuel percolating in the float bowls at least that is what it appears to me.  As Donnie Weinmister used to say "I'm not sure I understand everything I know about this thing."

Greg