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Strange engine noise

Tiny
LJYAROS
  • MEMBER
  • PONTIAC TRANSPORT
I have a 97 Pontiac Transport with 138,000 miles. I noticed today when under the hood while it was running that the engine sounds like it's leaking air like a flat tire. It has also been idling rough the past few days. Any idea what it could be?
Thursday, July 20th, 2006 AT 10:00 PM

1 Reply

Tiny
MIKEYBDMAN
  • MECHANIC
  • 623 POSTS
Rough idle plus hissing noise usaly mean vacuum leak. I would look at all of the vacuum hoses atteched to the throttle body and follow them to their respected valves. Dont forget to look at the one that leads to the transmission.
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Friday, July 21st, 2006 AT 3:17 PM

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