Mechanics

ROUGH IDLE WHEN FRIST STARTUP

1987 Mercedes Benz 300e

Engine Performance problem
1987 Mercedes Benz 300e 6 cyl Two Wheel Drive 140000 miles

When ii frist strat the caridle very rough for about 5 min
once it warm up it run good.
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Solruff
July 27, 2010.



Engine running rough or misfiring can be cause by the following: 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. Throttle position sensor.
11. Idle air control valve.
12. Engine compression problem

Rasmataz
Jul 27, 2010.