Date: 25 Jul 1999 21:01:40 GMT
From: "Duane Dostie" <>
Subject: Re: stalling on deceleration

soe <> wrote in article <>... > Question: > 1990 9000 turbo 5 speed. When I let off the accelerator after having > been somewhat lead-footed, the idle drops to zero and I need to > re-engage the clutch to start the motor again. It doesn't seem to > matter if the A/C is on or not, and it never happens if I keep the > clutch engaged. Idle is a little rough from about 850 to 1000 rpm. If > I am driving at highway speed and disengage the clutch, the engine speed > remains high 2000-2500 for nearly 30 seconds. Does anyone have any > ideas? Maybe the AIC or the pressure switch? How can I determine the > cause without mass parts replacement. Thanking you in advance. > > Stephen Ellison Wow, it must be Hooter Valve week! Find the Turbo Bypass Valve which is in the turbo plumbing. It has two approximately one inch hoses and a single vacuum line connecting to the center of the valve. It should be on the lower right had side of the engine as you face the hood of your 9000. Remove the vacuum line where it attaches to the intake manifold. Clean it off and suck on the line. It should hold vacuum. If it doesn't, that's your problem. It's about a $35 part. Easy to swap. Duane

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