[s-cars] Short term rough idle - follow-up

[Huw Powell]

> Old, tired, injectors frequently pass a little fuel after shut down, 
> some quickly, some over an extended period of time. This is especially 
> true of CIS or "mechanical" injectors.  In the cylinders with open inlet 
> valves, the fuel puddles on the piston top, in cylinders with the inlet 
> valves closed it sits on the valve.  As modern fuels are substantially 
> less volatile than those of days past (especially the "winter" fuels), a 
> significant quantity of un-atomized fuel momentarily fouls whatever 
> cylinder we're talking about, and the engine runs rough until it clears 
> the flooded condition.  It doesn't take much fuel to cause this, and 
> temperature only plays a role as a function of time.

The observation that some techron made things slightly better supports 
this too, I think.

Don't wait to fill up - when you are down to say a 1/4 tank, throw in a 
bottle and run it "superstrength" for a bit.

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/