R-Class (W251) Produced 2006-2013: R320CDI, R350, R420CDI, R500

07 r350 w251 P0016 P0019 P0021 P0335 P0073

Old Jun 3, 2024 | 07:26 AM
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2007 r350 w251 m272 722.9
07 r350 w251 P0016 P0019 P0021 P0335 P0073

Hi everyone,

I've recently purchased a used 07 r350. Initially car was driving smoothly w an intermittent no start. Also a front end bumping noise that only happened w immediate excessive acceleration/high rpms that only lasted during the 1/2 seconds otherwise had regular smooth acceleration and driving, no noise. The noise almost sounds like a trans mount. Only code was P073 ambient air.

Then P0335 cks was added. Still same symptoms.

Next day, yesterday, car started running rough. It threw P0016 P0019 P0021 P0410 w P0073 and NO P0335.

I was going to still change cks and now take off cam p sensors and see if everything is still aligned turning crank to 305.
ADVICE IS DEFINITELY WELCOME.

If aligned I'm going to do belt crank pulley, seal, bolt, oil cooler ( leaking), cam sensors, and change oil. Again any advice is welcome.

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Old Jun 3, 2024 | 07:25 PM
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From: MBworld
bone stock E55 AMG
moved to W251 forum...
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Old Jun 6, 2024 | 01:17 AM
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2006 R500
2007 is within the years of balance shaft problems for the M272. And 7g-tronic conductor plate problems. This is assuming you have the gas engine.

The OM642 is also problematic and seen as not worth repairing/keeping.

Unfortunately, depending on what the problem is, how many miles you have, and what options your car has, you might be better off dumping the R350 and finding a 2009 or newer model. Rebuilding/replacing the engine might be more than it is worth.
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