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Surging issue

Tiny
GRANNYSRIDE
  • MEMBER
  • 1989 FORD CROWN VICTORIA
  • 130,000 MILES
Hi, I have a 1989 crown vic with 130000 miles in it. Recently the alternator went out. I replaced it without any issues. However, since I replaced the alternator the engine surges up(200-300rpm )(no tach) and down quite a bit when cold. However when the transmission is put into drive the engine idle smoothly. It stops the surging when it warms up. I beleive that there maybe an issue in the choke of the motor. I also cannot get it to pass Oregon DEQ. Eventhough I just replaced the oil, cap and rotor. Next step maybe plugs and wires. But I have a feeling the root problem has something to do with this choke issue. I appreciate the help.
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Tuesday, December 6th, 2011 AT 1:17 AM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Check for vacuum leaks and check the IAC to see if it is working properly.
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Tuesday, December 6th, 2011 AT 1:30 AM
Tiny
HOMER1967
  • MECHANIC
  • 875 POSTS
I would suspect a vacum leak, double check your work and make also make sure al;lsure you didn't knock any hoses off or leave any off by accident. Also make sure all plugs are plugged in.
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Tuesday, December 6th, 2011 AT 2:26 AM

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