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#1
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Missfire on ML320
I own a 2000 model Ml which has developed a misfire on left hand bank of cylinders. It only happens when you accelerate hard then ease off the throttle and then the 3 cylinders lose the electrical power to the coils. Swtch ignition off then restart and all is fine again
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#2
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What procedures have you used to diagnose fault, please explain in more detail.
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#3
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Once the ECU has detected a misfire it will shutdown the cylinders to prevent further damage so don't bother tracing why the coils have no power going to them, the injectors won't be running either.
Having 3 cylinders on the same bank shutdown at the same time though is a bit unusual for that engine because it's a twin spark plug engine. I would be leaning towards a fuel problem on that bank (mixture adaptions may be way off for the cylinder bank). I'd check for fault codes with a scanner and check the fuel adaption figures for each bank and see if any figures vary greatly. It will be hard to diagnose without the right equipment.
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Alex. MB Tech Sydney, Australia Volvo 122S W201 190D 2.5 manual W202 C240 W203 C32 |
#4
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Have the exhaust back-pressure checked on that side of the exhaust thru the front O2 sensor!
__________________
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) Retired Moderator |
#5
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ML320 Missfire
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#6
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Do you have the "check eng light" come on when fault occurs??. I hope so, this will assist in diagnosis. I would suggest having it scanned for fault codes and going from there, you don't want to leave it to long as it may damage the cat. let us know what fault code/s there are.
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#7
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ML320 Mifire on cylinder 1, 2, and 3
Hello,
I also have an '99 ML320 has the same problem. I've replaced Cam, Crank, Spark Plugs, 3 news Coils on supposedly bad cylinders. All parts name brand are Bosch. I've also swapped spark plug wires around and still have the same problem. I've also cleaned Trans Connector, and other connectors. The codes i have are P0300, P0301, P0302, and P0303. Basically i am having problem on the pessanger's side bank. Things i have not done are clean out are throtle as it is not easy to reach. I have not clean or attempt to change/check MAF. Any advice is greatly appreciated. Alex |
#8
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ML320 Missfire
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#9
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Sounds like excessive exhaust back pressure.
I would have that checked by a shop with a back pressure gauge.
__________________
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) Retired Moderator |
#10
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Replace the CAT!........Probably not doing much for your exhaust vales, either!
__________________
Currently Driving 2006 E320 CDI 1999 E300 Turbo Diesl 2002 ML500 1995 E320 Station Wagon MBs I've owned 1997 E320 Assassinated by Pine Tree 1987 300E Wife Killed Engine 1981 300D Stretch Limo Total Loss 1970 250 Coupe 212,000 mi. 1974 450sel 184,000 mi. 1974 240D 377,000 mi. 1977 300D 204, 000 mi. 1979 280se God Only Knows! 1983 240D 130,000 mi. 1972 220D 280,000 mi. 1983 300SD 244,000 mi. |
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