87 Jetta rough idle

Tiny
PDLAVOIE
  • MEMBER
  • 1987 VOLKSWAGEN JETTA
  • 4 CYL
  • FWD
  • MANUAL
  • 162,000 MILES
Got an 87 jetta that idle's rough but is fine under acceleration?
Saturday, July 23rd, 2011 AT 8:50 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
https://www.2carpros.com/articles/engine-misfires-or-runs-rough

1.Defective spark plugs
2.Inadequate spark/coil,defective spark plug wire.
3.Lack of compression
4.False air leakage.
5.Faulty fuel injectors.
6.Insufficient fuel pressure.
7.Contaminated fuel.
8.EGR valve that is leaking.
9.Oxygen sensors.
10.Throttle position sensor.
11.Manifold absolute pressure sensor
12.Mass Airflow Sensor
13.Idle air control valve
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Saturday, July 23rd, 2011 AT 9:24 PM

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