Pulled all fuses on RCM, all were ok.
Found a procedure for a Mercedes ECU reset, not sure if it had anything to do with?

It's running but O2 problem, if I drive lite all is well, as soon as I hit it O2 goes crazy and it starts misfiring, when acting up it almost sounds like there is an exhaust leak, loose O2 sensor?

 

Could be many things from a clogged injector to a bad MAF but most likely a failure in the secondary ignition. What codes is it giving ?

 

Don't know yet a buddy is coming over with a scanner, I will post the results.
This is happing during normal driving, yesterday was driving normal nothing wrong and I hit it hard when it hit 3rd it started doing that, now it does it all the time.
Doesn't do it sitting the driveway only when under a load?

 

VERY similar to what my Graphite did at around 100,000 miles.

Twelve plugs and 12 wires did the job for me. I had a handful of O2 and misfire codes, the O2 codes were all indicating O2 was 'too high' and/or 'out of range high'.

Sorry, it's been four years, I can't remember the exact 02 codes but I had no less than six misfire codes. Car was fine, sitting there idling. Started up like a new car, just don't 'get on it'....

The codes will probably tell you enough that this thread was not even necessary. Of course, being a '6, you have more to deal with than a simple N/A does.

 

This is also making a cha cha cha type noise under the hood. Thank you for the code information

 

OK Updater, with a good snap on scanner...
1. All associated codes for a dead battery were present and cleared (past)
2. Started car up it ran maybe 1 minute and turned itself off
3. We could not re-establish communications with the Drive Train Controller (ECU)
4. We could see all other computers
Note; When it first started the hesitations I pulled into the drive way turned it off and tried to restart it, could not the same as what just happened
Question; Could the ECU be causing the problems? As far as the hesitations go?

Thanks to anyone willing to collaborate in this, will keep everything updated so if it happens to others they will have a clue...

 

If the RCM #3 relay or fuse fails, everything will stop and no comm with ECM. I'd check for power loss there.
" All associated codes for a dead battery were present " is what happens when you pull the positive side of the battery. Always remove negative terminal first.

 

No, dead battery. Thank you I will check RMC fuse and #3 relay.

 

Ok guys today's findings but not 100% sure yet until re-soldering, just so you guys know all soldering looks bad on these things. Re- soldering everything at this point, will keep forwarding updated...
No matter failure or success I will forward all of this information...

 

Updater, looks like the #3 relay is bad (did not toggle when voltage applied) thank you "Padjett", replacing in hopes of establishing ECU communications.
Next step could be another ECU, hope not?

 

 

If you can see error codes ,you are communicating with the ECU.

 

Thank you Sir, but we can't read anything else, not sure if we are supposed to???
And made sure to pull off neg side of battery first...
Will up date with found error codes soon...
We are using a Snap-On Pro...???

 

Updater, this morning she fired right up and cut off in 5 seconds and again no restart, if that fuse is blown again there must be a dead short somewhere...
Will start back on this in afternoon, not a blown fuse and still cannot talk to ECU, can't ever see codes now....?

 

Where is or what is the best way to go for this or another ECU? Any suggestions so far I have seen $300 to rebuild and others at $1,200 and $1,346...

 

Have you checked the fuel pressure on the fuel rail ? "Starts, runs for a few seconds, dies" is consistent with a fuel pump/filter/lines problem. Should have about 40 psi to idle, 60 at speed.

 

Thank you that will be checked, what size injectors are stock? 36lb?
And it won't restart same as before...

 

You were correct, running ok but still not perfect, O2 sensor went out and thank you...