B200 Problems, not sure how to proceed - Mercedes-Benz Forum
 
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post #1 of 6 (permalink) Old 05-20-2019, 12:43 PM Thread Starter
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Vehicle: 2007 B200 Turbo
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Unhappy B200 Problems, not sure how to proceed

Hey guys, I've read your forum months before I purchased this car so I want to thank you all, your knowledge has helped me immensely.

I'm 18 years old and I purchased a B200 Turbo used for a super good price, in good condition. Probably a stupid car at this age, however, I fix everything myself and have access to a hoist and diagnostic computer.

I have been having a recurring issue with the Divert Air Switchover valve stuck in the open position. I replaced the valve located slightly behind and under the inlet tube from the air box to turbocharger, but I'm still getting the same code.

I replaced the spark plugs 2 months ago myself, my god what a PITA that was... Yet I'm now experiencing a misfire on cylinder 1 and 4. Does the coils go Coil 1: Cyl 1,2 Coil 2: Cyl 3,4 or does it go Coil 1: Cyl 1,4 Coil 2: Cyl 2,3? If it's the latter, I will swap ignition coil to see if that is the root cause. Otherwise I think perhaps spark plug wires, or carbon buildup on intake valves?

Sorry for wall of text, thanks for your help.

Anthony
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post #2 of 6 (permalink) Old 05-21-2019, 04:57 AM
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The switchover valve code could be the part itself (mechanical issue) or maybe the control or operation system (electric / vacuum). Check plugs, connections, and the like.

The ignition issue could be just damaged wires from the plugs change. Check for blue sparks around the area in the dark (WATCH OUT FOR MOVING PARTS) while the engine is running.

Don't have a pic of the wire routing handy right now.

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post #3 of 6 (permalink) Old 05-21-2019, 12:05 PM
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BTW, a good scanner will show you misfire counts. Could be especially helpful to have someone watching the scanner while you wiggle wires or spray water (spray bottle) on the wires. Once again, BE CAREFUL with moving and hot parts, and the ignition secondary voltage IS VERY HIGH!!! None of those are fun.

I know I took pics of the area. Let me find my USB drive.

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post #4 of 6 (permalink) Old 05-21-2019, 12:18 PM
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post #5 of 6 (permalink) Old 05-21-2019, 12:22 PM
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post #6 of 6 (permalink) Old 05-22-2019, 11:45 AM
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