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1992 Chevy Suburban hissing noise after I turn off motor un

Tiny
RICHARD PEREZ
  • MEMBER
  • 1992 CHEVROLET SUBURBAN
  • V8
  • 2WD
  • AUTOMATIC
  • 99,000 MILES
I went to the store and the ABS and Traction Control Light stayed on. When I arriive home and turned off the motor, there is a hissing sound but loud coming from under the truck carriage. It sounds like it is coming from the exhuast system but can't be sure. It has 99K miles on it and I haven't taken it for service for two years which I will tomorrow but I want to know how to take care of the noise.

Thank you, richard Perez 559.584.7499
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Sunday, December 14th, 2008 AT 5:17 PM

9 Replies

Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
Obviously, without hearing the noise, I can't tell you exactly what it is. Did the noise quit by itself after a second or two, or what happened? If you were to go out now, start and drive the truck now, would the noise be back? Please advise.
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Sunday, December 14th, 2008 AT 6:52 PM
Tiny
RICHARD PEREZ
  • MEMBER
  • 5 POSTS
No the noise continues whether the truck is on or off. My wife just left in the Suburban and the noise is still on. When I turn the truck off it continues. Not being a mechanic it is hard to say where its coming from. Its not from the engine but from underneath the carriage. It stayed on for over an hour and does not turn off. It sounds like a small motor and its not from the seats or anything inside the truck but underneath. The traction light and abs lights are the only ones that stay on when the truck is on. Of course they go off when I turn the engine off.
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Sunday, December 14th, 2008 AT 7:09 PM
Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
Is the noise coming from the fuel tank? You're sure it's not coming from under thr hood?
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Sunday, December 14th, 2008 AT 8:33 PM
Tiny
RICHARD PEREZ
  • MEMBER
  • 5 POSTS
Actually it's not a hissing noise but more of a "like your motor is still on" noise. It is not the gas tank or the motor area. I got down and touch some parts down there with a screw driver just to see if I could isolate the noise and there are a couple of parts that seem to be attached to the undercariage and adjoined to the frame and have some metal lines hooked up to it. The noise seems to be generating from their. It's like the catalytic converter is still on and some gadget that has a flow does not stop. Why would the ABS and Traction Control lights stay on when I am driving?
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Sunday, December 14th, 2008 AT 8:53 PM
Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
OK, what you are hearing is the ABS pump running which is indicitive of a pressure switch failure. The true diagnosis need to be done on a computer scan unit with ABS capability. It will have to be "hooked up" to an anallizer. You may want to pull the ABS fuse, or you may have a dead battery come morning.
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Sunday, December 14th, 2008 AT 9:27 PM
Tiny
RICHARD PEREZ
  • MEMBER
  • 5 POSTS
Where is the ABS fuse located? Wouldn't it be easier to disconnect the battery. I know what that looks like.

Thanks
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Sunday, December 14th, 2008 AT 9:43 PM
Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
The ABS fuse should be #2 in the underhood fuse block.
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Monday, December 15th, 2008 AT 7:56 AM
Tiny
RICHARD PEREZ
  • MEMBER
  • 5 POSTS
I did find it and removed the ABS Fuse and the ABS Pump stopped. Thank you. I will replace the fuse and hopefully this will cure the problem.
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Monday, December 15th, 2008 AT 9:16 AM
Tiny
ZACKMAN
  • MECHANIC
  • 4,202 POSTS
Replacing the fuse will solve your problem. James to you to pull the fuse to prevent your battery from being drained by the faulty ABS motor. You need to have the ABS motor serviced/repaired/replaced.
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Monday, December 15th, 2008 AT 6:12 PM

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