Losing Injector 8 At 4000 Rpm

Nathan Owner/Technician Wodonga, Australia Posted   Latest  
Question
Driveability
2005 Mercedes-Benz CLK500 5.0L 5-spd
P2058 - Reductant Injection Valve Circuit High Bank 2 Unit 2

HI ALL . every time engine rpm reaches 4000 rpm the engine lights comes on , throwing a p2058 code injector number 8 / misfire subleted vehicle to auto electrician , so far his replaced injector , coil plugs , maf sensor IAT sensor was was wondering if anyone has encountered this problem, reflash ecu maybe ? any help would be appreciated . cheers Nath

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Mike Technician
Salina, Kansas
Mike Default
 

Can u back probe the coil and see if loss of power to coil is the plug good change coil to other cyl see if changes , Is the motor moving around pulling a wire harness out a bit

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Paul Owner/Technician
Belleville, Illinois
Paul Default
 

Without a lab scope to monitor the ignition coil and fuel injection driver at the PCM, this will become nothing more than a Witch Hunt. Has anybody found a bulletin wedding dresses a reflash to solve this problem.

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Albin Diagnostician
Leavenworth, Washington
Albin Default
 

Start at the beginning of the injection process, scope the cam & crank signals and make sure they are sending the correct message to the PCM, move on then to the ignition and injection commands.

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Eric Owner/Technician
Edgerton, Wisconsin
Eric Default
 

Did you read the Fault Setting Conditions as defined by Mercedes Benz? You have a misfire on cylinder #8 and if have too many misfires per 200 engine revolutions, the number of which depends on engine speed and load according to the performance map coded into the engine computer program, the engine computer will disable the fuel injector of the misfiring cylinder(s). Are there any other codes…

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Eric Owner/Technician
Grand Rapids, Michigan
Eric Default
 

Has basic engine health been determined? Compression, static and running? Sounds like an in cylinder transducer isn't in the cards, but if available, make sure to check.

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Ken Owner/Technician
Phoenix, Arizona
Ken Default
 

I agree with others, a lab scope and amp probe on the coil (and check against a known good coil) is where you need to start....as you can see the auto electrician has tried the parts cannon and it so far has missed the target...

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Ken Owner/Technician
Phoenix, Arizona
Ken Default
 

also when I look up p2058 for a m benz clk500 with 5.0 all tests go to cylinder 8 coil not an injector....but the service material can be wrong!

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George Owner
Ikeja, Nigeria
George Default
   

Hi, have you tried checking the wiring harness for a short or reverse wiring that could be affecting 8? Or could a malfunctioning fuel injector shut down a coil to prevent smoking by design?

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