w210 e280 Maf Problem ??

[syseng]

Hi all
just changed cars from MGzs180

My 2001 e280 which is dual fuel is giving constant fault codes, I have been told that the post cats have been removed 02 sensors replaced and plugs changed the errors that show up are below I cannot detect a misfire when driving ,the car will run very erratic from cold sometime but not all ,if I turn the engine off and wait a few seconds restart the fault clears

could this be the Maf or vacuum pipes , I have ruled out water in the fuel as the engine is up to temperature and running on LPG but please correct me if I am wrong

cheers paul

Current Fault Log

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P0135: O2 Sensor Heater Circuit (Bank 1 Sensor 1)
P0141: O2 Sensor Heater Circuit (Bank 1 Sensor 2)
P0136: O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)
P0304: Cylinder 4 Misfire Detected
P0306: Cylinder 6 Misfire Detected
P0305: Cylinder 5 Misfire Detected
P0300: Random/Multiple Cylinder Misfire Detected
Pending Fault Log

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P0130: O2 Sensor Circuit (Bank 1 Sensor 1)
Historic Fault Log

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ECU reports no historic faults
Other discovered fault codes
(possibly pending, current or manufacturer specific)

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ECU reports no other fault codes logged
End of report.
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[74merc]

Have you checked the coilpacks and the plug leads are all good?
I had a C280 V6 on gas which developed a misfire. A new plug lead sorted it out. The insulation on them breaks down and can earth on the shield around it.

[syseng]

Thanks for the reply 74merc

All the plugs were been replaced abt 1200 miles ago before i had the car ,i have not checked the leads as yet i ran engine check pro diags today 1 error was Fuel system 1 status (closed loop system fault) not sure if this is the 02 sensor. I do not think it is the plug leads might be wrong , because if I switch off and restart after a few seconds the car is fine and plays good for the rest of the day, I thought it might be the Gas causing the problem so I switched that off and started fault still there switched off again restarted all is fine ,I will have a look tonight at plug leads when I have done the auto box oil and filter change

can anyone tell me what my short Term and long Term fuel trim figures mean I tried to put them up here but the formatting went wrong , I have them in a file

paul

Edited by syseng on Friday 13th December 16:43