Vapor Lock 2

[Kneale Brownson]

When my '87  5Ktq wouldn't restart while hot, it turned out to be a split 
in the multiple-outlet hose at the back of the engine that connects the ISV 
to a couple other bits of air plumbing.  Split wasn't visible and I could 
only feel it with the fingertips if I squeezed it just right.  That was the 
most expensive-per-inch piece of hose I ever purchased.



At 03:03 AM 06/30/2001 +0000, scott miller wrote:

>To recap:  it will crank, but won't start or even fire when the engine is 
>hot.  It starts immediately after cooling.  Hot idling is fine.  The 
>problem has gotten gradually worse, with no repairs recently.  10v, 200k, 
>100k on injectors, 20k on fuel pump, a/c recently died.
>
>I replaced the check valve on my fuel pump, no change.  That was my local 
>experts theory, the pressure was bleeding off the line and allowing it to 
>boil.  I loosened the fitting on the filter and got a good spray of fuel 
>after it failed to start just now, so there is some pressure.
>
>So far the responses from the list blame the injectors, but I'm doubtful.
>When my injectors went bad last time, it never got worse than a delayed 
>start.  I mean just a couple extra compression strokes.  That was with 
>several leaking injectors.  This time I can crank for several minutes, get 
>it to fire on starter fluid, and still not get it to run.  Even after much 
>cranking and firing on starter fluid it, won't run until it cools for at 
>least 30 minutes.  I'm definitely purging the engine of residual fuel from 
>leaky injectors with all the cranking and running on ether.  It's 
>definitely lacking one of the elements of combustion when hot.
>
>I'll check the injectors next, but could it be electrical or a vacuum line?
>The after-run blower checks good.  The turbo hoses look good.  All the 
>usual problem vacuum lines are fairly new.
>
>My wife was excited about my getting a newer used quattro this 
>fall/winter, now she's getting skeptical.  This is not good!
>
>Scott Miller
>'90 200tqw
>Holland, MI
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