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1989 Nissan 240SX Suddenly idles rough and dies at idle

Tiny
RHTATE
  • MEMBER
  • 1989 NISSAN 240SX
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 90,000 MILES
Ran perfectly until after a 100 mile freeway trip. Coming off freeway after trip car died at first stop sign. Will die now at idle, very rough at idle must keep engine rev'ed up. Heavy smoke and gas smell at idle. Black soot on ground after a minute of idle.

Runs fine at all speeds above idle.
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Saturday, December 12th, 2009 AT 10:12 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
It is running too rich (too much fuel and not enough air) Check for blockages at intake. Also, has the check engine light come on? Does the engine have its normal power other than the idle problem? You may also need to check the fuel pressure. The regulator may be bad. Have you checked for vacuum leaks? Also, make sure the EGR isn't plugged.
Let me know what you find.

Joe
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Sunday, December 13th, 2009 AT 12:33 AM

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