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Old 10-23-2005, 12:59 AM   #1
alcimedes
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Default Vacuum leak?

So I picked up a used 93' SW wagon the other day. Drove well, oil problems which I'll be addressing, but it has one other issue. I did a search but the threads I found about soft brakes didn't really seem to match up.

To start with, the brakes seem soft, and when stopping, the RPM's are high (around 2k) initially, and slowly drop down over 5 seconds or so to 800 to 1,000. (good)

I also found that if I press the brake repeatedly while stopped, the RPM's will climb. When I let off, they'll drop dangerously low, and the car will start to stall out. It almost dies, but hasn't yet. Any suggestions on where to start replacing things? I've got a PCV valve on its way, and I have access to plenty of replacement vacuum lines if necessary. I'm also planning on replacing the temp sensor while I'm at it. Any other suggestions?

Great site btw, tons of useful information.
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Old 10-23-2005, 03:50 AM   #2
sc2dave
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Default Re: Vacuum leak?

spray some carb cleaner around connections,to see if the idle gets affected.
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Old 10-23-2005, 08:45 AM   #3
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2002 L-Series 3.0L Sedan
1994 SC2
Default Re: Vacuum leak?

Yup, sounds like a vacuum leak. Intake manifold gasket, throttle body gasket, and PCV hose are prime candidates but, as sc2dave implied, the whole vacuum system should be examined.
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Old 10-23-2005, 01:03 PM   #4
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Default Re: Vacuum leak?

The vacuum leak is you. You are getting a normal reaction to the abnormal condition you are putting on the brake system. The power brake booster is vacuum powered and by you repeatedly rapidly pumping the brake pedal you are producing the vacuum leak.

The high RPM's when coming to a stop could be due to a PCM coolant temp sensor.
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Old 10-23-2005, 07:58 PM   #5
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Default Re: Vacuum leak?

Think it was a bit of both. Spent the day removing rust spots, and while I was at it played around with the lines under the hood. None were cracked, but apparently the adjusting was all it took. No longer have high revs when coming to a stop, tach drops to 1k like it should.

I can still make it die if I pump the brake while stopped, but as a previous poster mentioned, that was my fault. Turns out the car didn't produce enough vacuum for both the braking and the engine at idle, which is why it was dying. Oops.
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