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  #1  
Old 05-08-2011, 07:13 PM
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Angry 1991 190E 2.6 check engine light

Ok gang I need run down on two things first the fuse #3 had blown and I also have a check engine light. I was having a rough Idle and hesitation at begining my trips to he store or what ever, I did not have the light when checking the duty cycle, alwas good at 49 to 54%. changed plugs rotor dis. cap and new wires. No change in roughness of idle, then I found that #3 fuse was bad, changed that and it made a great improvement of idle. my question is WHY!

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Old 05-09-2011, 08:13 AM
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Check engine lamp on a FEDERAL version car happens only when the O2 sensor is inactive for 5 minutes.

Either power to O2 heater, bad O2 sensor, misadjusted mixture.
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Old 05-10-2011, 03:48 PM
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check eng. light

thanks MBdoc, power sorce for the ox comes from where? is it fused?
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  #4  
Old 05-11-2011, 08:08 AM
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O2 sensor heater is powered from the MAS relay.
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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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  #5  
Old 05-12-2011, 12:47 PM
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MAS relay

Quote:
Originally Posted by mbdoc View Post
O2 sensor heater is powered from the MAS relay.
thank you doc

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