1987 Nissan 300ZX rough idle

Tiny
BWILKIE
  • MEMBER
  • 1987 NISSAN 300ZX
  • 6 CYL
  • 2WD
  • MANUAL
  • 100,000 MILES
When the car is cold it will idle rough. Once the car reaches operating temp it will idle smooth. I realize that when you put a load on the electrcial like the heater fan it will bump the idle up and this will help slightly. I have changed the alternator that was faulty and battery and gave the car a tune up. It is still the same.
Wednesday, April 28th, 2010 AT 4:56 PM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Clean IACV-AAC valve and test the throttle position sensor and the airflow meter
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Wednesday, April 28th, 2010 AT 5:11 PM
Tiny
RANGERDANGER17
  • MEMBER
  • 224 POSTS
Wat valves are those mine does the same thing
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Monday, January 3rd, 2011 AT 7:58 PM
Tiny
BWILKIE
  • MEMBER
  • 6 POSTS
The IACV-AAC valve is bolted on the side of the throttle body, and is attached with three small bolts and has several small hoses, it is the size of a small cell phone. If you gogle it you will find it. I took mine off and srayed it with carburator cleaner and it works a lot better. I did have to adjust my idle speed slighty higher after the cleaning.
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Tuesday, January 4th, 2011 AT 3:58 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Bwilkie-TY for the donation and for using 2carpros
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Wednesday, February 2nd, 2011 AT 5:07 PM

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