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Re: 9000T cruise surge Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Thu, 23 Oct 2003 05:27:50
In Reply to: 9000T cruise surge, Clark, Thu, 23 Oct 2003 03:55:21 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The turbo is reduced to base boost when the cruise control is engaged. Depending on your engine, base boost may still be pretty peppy. Base boost is about 1/2 of the way into the yellow.
If you completely lost turbo boost, I'd see why the car wouldn't surge - it would barely get out of its own way.
Try this - find some place where you can set the Cruise Control to around 50-60 mph. Click it off and find a nice hill on a back road somewhere. Hit the hill around 30 mph, and hit Resume - what does the boost gauge go to? Does it stick to half-yellow, or does it go all the way to the beginning of the red?
If it goes above half-yellow, then the CC cutout isn't working. The CC uses a vacuum pump to pull an actuator, that opens the throttle. In that vacuum line is a switch - if the switch sees vacuum, it knows the CC is engaged, and cuts the power to the APC solenoid. When the APC solenoid is de-engerized, you get only base boost. The switch is pretty simple - just an on-off switch wired in series with the APC solenoid.
It's possible that either the switch is always stuck closed, or someone just removed the vacuum line from it, or wired around it.
However, if you do get only base boost when the Cc is engaged, you might just have a sticky actuator. It uses a chain to pull on the throttle. If the actuator is sticky, the vacuum pump will pull very hard to get the right speed, and then the actuator will jump, causing a surge; the vaccum pump will back off because the speed is too high, and the cycle starts again.
good luck!
posted by 192.249....
, Thu, 23 Oct 2003 05:27:50 <-- Viewing This Message
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