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Vacuum leaks

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Old 11-12-2011, 10:49 PM
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Bjbpe
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Default Vacuum leaks

My cruise control does not work well and I have to press the throttle to start the engine so I guess I have a vacuum leak. I've already replaced the large hose that goes under the intake manifold and am now going after all of the rest. Any comments out there about special places to look besides replacing anything that remotely resembles a vacuum hose?

I should know by now to give the year. It is an '87 S4 with manual transmision.

Last edited by Bjbpe; 11-13-2011 at 09:59 PM. Reason: Had to add information
Old 11-13-2011, 12:22 AM
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Lizard928
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Please post up the year and model of your car.

As well, your HVAC diaphragms can leak too
Old 11-13-2011, 07:02 PM
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fraggle
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bah, a little quick troubleshooting and some actuator rebuilds and you'll be back on the road in no time.

Old 11-13-2011, 11:15 PM
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JHowell37
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If you have to press the gas to start the engine, you probably have something going on other than a vacuum leak. I would suspect a MAF that's about to pack it in.

As for the cruise, the most common problem is a progressive failure of the control "brain" that's under the dash. The symptoms usually start out as setting the cruise and the car will speed up on its own and then slow down, speed up, slow down, etc. Eventually it just stops working altogether. The problem is typically caused from numerous cold solder joints as a result of **** poor build quality from the manufacturer. Rebuilt/repaired boxes are available.
Old 11-13-2011, 11:43 PM
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fraggle
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Has anyone rebuilt their own cc brains? If it's just cold solder problems it should be easy.
Old 11-14-2011, 12:11 AM
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Bjbpe
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Originally Posted by JHowell37
If you have to press the gas to start the engine, you probably have something going on other than a vacuum leak. I would suspect a MAF that's about to pack it in.

As for the cruise, the most common problem is a progressive failure of the control "brain" that's under the dash. The symptoms usually start out as setting the cruise and the car will speed up on its own and then slow down, speed up, slow down, etc. Eventually it just stops working altogether. The problem is typically caused from numerous cold solder joints as a result of **** poor build quality from the manufacturer. Rebuilt/repaired boxes are available.
Please define MAF??
Old 11-14-2011, 12:20 AM
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Lizard928
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Originally Posted by Bjbpe
Please define MAF??
Please read the new user FAQ page before anything else.



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