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  #1  
Old 02-02-2003, 06:46 PM
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Join Date: Oct 2002
Location: Alaska
Posts: 33
Severe Hesitation in 420SEL 1989

OK, when the car has been sitting for atleast 6 hours or more and I start to drive the car, the following happens
As long as the temperature is below 70 degrees it hesitates between 2000 and 2500 rpm's. It hesitates quite heavily more like jerks, and there seems to be severe loss of powere during this time. However as soon as the temp gauge reaches the 70 degrees mark (just below the 80 dgrees) it seems that the car is as if on a turbo (the power comes back and evrything is fine). The car has 178K miles and I used sythetic oil for the first time in this kind of a cold weather in Alaska (i.e. first time synthetic and first time cold weather, the car was in Texas before). The outside temperatures are in the 20's. Any ideas/suggestions/advice etc would be greatly appreciated. Thanks in advance

Sohaib
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  #2  
Old 02-02-2003, 06:49 PM
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Join Date: Mar 2000
Location: Gainesville FL
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Probably secondary ignition: plug wire ends or cap and rotor.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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  #3  
Old 02-04-2003, 01:41 AM
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Join Date: Oct 2002
Location: Alaska
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But would a tune up related probelm be temperature related? If so why?

Thanks
Sohaib
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  #4  
Old 02-04-2003, 11:54 AM
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Secondary voltage is heavily determined by load. The voltage goes up to satisfy demand. If the circuit is deficient the greater the voltage the more likely a break down.

During cold running the possibility of moisture related shorting to ground reduces the voltage necessary for such.

The combined properties add up to the highest likelyhood of secondary break down being cold. Load is highest and resistance is lowest.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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  #5  
Old 02-04-2003, 08:29 PM
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Join Date: Oct 2002
Location: Alaska
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Thanks steve, I think I shall be doing a tune up pretty soon.

Sohaib
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