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1994 Toyota Cressida Engine runs rough in the Morning

Tiny
PAUL LEE
  • MEMBER
  • 1994 TOYOTA CRESSIDA
  • V12
  • FWD
  • AUTOMATIC
  • 138,000 MILES
My car engine runs rough in the morning. The rpm is higher than normal. The engine sounds louder than normal. However, after running the car for 15 to 20 minutes the car is smooth again. The rpm becomes normal. I ve changed the spark plus, plug cables, alternator and battery but the problem is still there each morning.
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Wednesday, March 3rd, 2010 AT 9:46 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Engine running rough or misfiring can be cause by the following-inspect and test all the following below:
1. Defective spark plug.
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. Idle air control valve.
11. Throttle position sensor.
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Tuesday, April 20th, 2010 AT 5:48 PM

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