roadtalontsi

i would agree your car has half the control modules, 2 less turbos, 4 less cylinders, no hydrualic suspension or extra coolers. then again bragging about working on a whopping 3 s65's isnt anything special. now having replaced motors in a 600 thats alot more note worthy.

Jasonoff

My guess is this part. https://www.parts.com/index.cfm?fuse...SHUT-OFF-VALVE

GoPwr

You had asked if the head bolts had been done. I am jumping in here to ask your opinion on my situation.

2nd owner 2009 ML63AMG. Original owner had all maintenance done at dealer including tire purchases.

I pirchased with aprx 63k miles. A few thousand miles later, CEL - the dealer said head bolts failed. After negotiating with MB USA and my local dealer- a full engine out repair and flush was done to the tune of $8.3k

That was about 6 months and nearly 10k miles ago.

My wife primarily drives the car and we both noticed that occasionally it had a rough start up. I was literally on the way to have the battery checked as step 1 of the diagnosis.

CEL light came on en route to Autozone. They said battery was weak and pull the code P0016.

The car is set to go back to the dealer again today.

Is the recent headbolt replacement pertinent to this new countershaft balance error code / rough start?

it seems to run fine otherwise.

Celicasaur

This can be caused by a vacuum leak at idle, usually an internal one, as external would trip a cel real quick.

It's entirely possible that one of the throttle bodies is faulty and can't shut 100% under engine vacuum, which is allowing additional air into the engine which the maf has accounted for, but the engine doesn't know what to do with, because it forces the idle up....thus the only solution for the PCM is to pull loads of timing to drop the idle rpm.

Ask me how I know. I only spent most of 2017 trying to work this out on my own car

michobebe

How would you check for the throttle body problem you're talking about?

I'm experiencing ALLL of the camshaft codes, sooner or later after erasing them and driving the car hard enough: P0012, p0014, p0016, p0021, p0024 , with the purge valve too ironically p0444.
check for intake and exhaust camshaft reading at idle, they are perfectly good (-15, -15) and (28, 28). So I guess problem comes from ignition angle(which I haven't checked as I'm looking from a Autel scanner, haven't hooked my STAR yet)
Also concerning the throttle
The data I'm getting for both sensors of both throttle bodies with engine off are:
Throttle body 1:
Sensor 1 0.34
Sensor 2 4.66
Throttle body2:
Sensor 1 0.34v
Sensor 2 0.66
all of them reversing to their opposite voltage (5- initial Volt) at full throttle
Maybe that would be different with the engine running 🤷

Manifold pressure is about 300inh at idle and around 400 with throttle halfway.. does that make sense?

Finally, I got the code p0101 after about 100km of driving but it registered as "stored" only. Not sure how this could relate to the rest.

mrfatd

@michobebe any updates on this?

michobebe

No, not at all, but.... I have a suspicion it's air leak past the aluminum plate inside the manifold caused by corrosion causing air leak behind the throttle bodies, affecting how the engine is trying to control it's timing. I read it from other members but haven't gotten to open the manifold yet. I'll store the car as is for the season and will see in the winter/spring before next summer

mrfatd

Fair enough. I think I might be in a similar boat. Season almost over and was going to park my car over winter. Might need to take the covers off again though..

Sorry to hijack your thread but I have very similar codes and symptoms. What do you think of these camshaft position values I just had pulled from STARS?
Intake camshaft right cylinder bank 65deg
Intake camshaft left cylinder bank 62deg
Exhaust camshaft right cylinder bank 28 deg
Exhaust camshaft left cylinder bank -14deg (?) < That doesn't seem right. Position sensor?

This happened during the relearn process.
Regards

michobebe

First I think you're mistaking intake-exhaust with left-right. As -14 and 28 are good numbers for each.
second, the 62 and 65 are not supposed to. What's the right solution? i wouldn't know, still trying to solve mine