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Dreaded P2004 code

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6.1K views 4 replies 5 participants last post by  jbanks15  
#1 ·
Hey all... First some background. I recently purchased this car, a 2007 SLK 350 (88k), and it drives fine.
No issues with it, no CEL, but when I code scan it with my torque app and ELM 327, it shows the infamous P2004 intake runner error.
I have lots of experience working on cars, all they way down to engine pulls/rebuilds, but I'm at a loss on this one.
Things I have tried...
1) Clearing code - it just comes back
2) manually moving right side linkage - All other attached links and actuator move
3) verified no broken air lever - looks like it was actually already replaced with an aluminum one.
4) had Girlfriend rev engine while I watched for lever movement - It moved around 2000-2500 RPMs
5) pulled right side (passenger) position sensor and manually actuated flap and it moves inside so it should be triggering the Hall effect sensor - I haven't tested the resistance on the sensor yet though.
6) pulled the engine hoist point on left (driver) side to see if the other position sensor was installed and connected. I haven't pulled it out yet since you have to pull the fuel rail to do it. If/when I do, I'll verify the things in #5 and check resistance values.

Can anyone think of other reasons, besides an actual wire grounding issue that could be causing the issue?
As I said, I have no CEL, only if I pull the codes and the car seems to drive and idle normally.
I did find 1 connector that I'm not sure if it's supposed to be connected to anything or not. It just looks odd just ziptied to the other harness. Anyone know what its supposed to plug into or is it an option that is not installed on my car?

597626

Thanks for any help, and yes I already pulled a data card.. :cool::cool::cool:

Bryan
 
#4 · (Edited)
AFAIK that extra connectors is a diagnostic connector and should be disconnected.

The manifold has three "vacuum capsules" controlled by two electrically operated valves, these can fail, as can the hoses that attach them to the manifold and the capsules. You can test the capsules with a hand vaccum pump, although I can't remember if possible in situ.
 
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