Vapor Lock 2
Kneale Brownson
knotnook at traverse.com
Sat Jun 30 08:53:43 EDT 2001
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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>
>
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