Get the latest advice about your car

Get Started
Advice » Q&A » 1992 Mercedes-Benz 400E

Q&A

Ask Your Question

1992 Mercedes-Benz 400E

Question: My 1992 400e Mercedes runs and idles very poorly when it's first started.

Question

alpineviking, Portland, OR, August 09, 2011, 17:20
Profile_thumbnail
 Rookie

It runs lean and very rough for the first few minutes. After the warmup, the emission control air compressor stops, and at the same instant, begins idling good and runs great. It sometimes stalls when it's warm, and won't start at all until it cools back down. It's possibly a wiring harness, but I am reluctant to replace it, until I am sure of that diagnosis.

1 Answer
Answer It
Flag This

  • Answer #1

    dandd August 11, 2011, 13:54
    Profile_thumbnail
     Master

    The air system is putting the air in the wrong place, need to resolve that issue. If the car runs fine with the air pump off, that is a great clue as to what system is malfunctioning. The hot/warm stalling could be several things like a defective ignition module crank sensor etc. I found that the wring was bad on the later ( 1997-> ) MBs, not so much this vintage.

    Reply
    Flag This
Answer Ranks

This week's top 10

1 globalhelper 6 Autohaus Lake Norman
2 milesauto 7 TimGoodreau
3 csubak30 8 Merrimack Auto
4 jose8889 9 raiderron
5 obdcar 10 Camster