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#1
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380SE - High fuel consumption : Diagnosing the Cold Start Valve
From previous posts, I gather that the high fuel consumption could be because of (1) a faulty cold start valve or (2) a faulty warm-up regulator.
Question is - how do you troubleshoot / diagnoise a faulty cold start valve ? How do you diagnoise a warm up regulator. Here are some symptoms: 1) Starts great when cold 2) Takes a few additional turns of the engine to start when warm 3) Starts with a stumble when warm and you just let go of the key after the first turn. 4) Slightly rough idle when warm. Smooth idle when cold. |
#2
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Be sure to have someone check the fuel accumulator. It is in the rear of the car at the fuel pump area.
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Benzmac: Donnie Drummonds ASE CERTIFIED MASTER AUTO TECHNICIAN MERCEDES SPECIALIST 11 YRS |
#3
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380SE - High Fuel Consumption
Donnie,
The MB dealership replaced the Fuel Pump and Filter only 2 months back. Wouldn't they have pointed out a faulty fuel accumulator. Also, from your experience, can a faulty fuel accumulator cause excessive fuel consumption ? I can check it. What should I look for ? Leaks ? Which would be the most likely culprit ? Cold Start Valve ? Thanks, Amit |
#4
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A faulty accumulator could account for all your symptoms except fuel consumption.
The only way the cold start would affect fuel consumption was if it leaked. If we were talking a US 380 then proper fuel consumption will likely occur with proper timing and closed loop fuel control. Read the archives about monitoring the duty cycle of the frequency valve at pin #3 of the diagnostic socket. Proper monitoring of the duty-cycle can allow the proper mixture adjustment without exhaust gas readings.
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Steve Brotherton Continental Imports Gainesville FL Bosch Master, ASE Master, L1 33 years MB technician |
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