So I've got 208k miles on my W211 with the M112.949 motor. Plugs, and plug wires, fuel pump, filter & sender, engine air filters, high-quality fuel system cleaners (ie Techron, & another great one, i forget name) have either been changed or used in the relatively near past.

So here we go: upon quick throttle, usually from a stop, the engine totally cuts out/bogs for a moment or two (doesn't seem like a misfire), and if I keep the gas on, probably to the floor, the engine suddenly & seemlessly revs up properly like the powerhouse studly motor that it is.

So, the problem is often intermittent, and has occasionally stalled while at a stop or idle or switching between fwd & reverse gears.

WHAT COULD THE PROBLEM BE!?

I'd like to know if it could be the throttle body, or maybe MAF or other sensor or WHAT could be causing this? It is progressively getting worse. It seems to me as if it were the throttle "motor" sticking in the housing... but I could be way off base.

I have no MIL (check engine) light on FWIW.

What gives???

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2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)

The lack of a MIL/CEL isn't conclusive, because codes can store before the algorithm reaches the point that it triggers the MIL.

Bottom line: The first step with a drivability issue is to check for codes.

You're in CA, so you can't just run by an auto parts store, but you can order a basic stand-alone code reader from amazon for under $20. It will read and clear OBD-II codes, which in many cases is all you need. Amazon.com: Autel MaxiScan MS300 CAN Diagnostic Scan Tool for OBDII Vehicles: Automotive

Until you read codes, you'll still be wandering around in a cave without a flashlight.

Good luck.

THe good news is that I ordered a OBDII wire (to USB) with appropriate software... it's been a long time in the waiting... but I finally did. But until it arrives, I will have ALex (my local mechanic) get a me a reading of the codes.
Thanks for stating the obvious (sometimes I just need a SLIGHT nudge)!

__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)

check all sensor connections before spending money.I replaced $710 in parts only to find my crank sensor wire had come unplugged tight.I had run over debris on the road.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran

Almost sounds like a sensor issue or perhaps wear and tear on the drive by wire throttle pedal sender unit...if it has a dead spot near the beginning of travel it might be causing a signal hiccup.

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

This is kind of what I was thinking... is there a particular part number? The throttle body housing? THey can't be cleaned on the newer cars, I've heard... Do you think it could be the MAF?

Thanks for the timely responses!

__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)

Yes, could be MAF, crank sensor, TPS ...

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Prost!

Crank shaft position sensor was replaced a little over a year ago.

Can't I clean the MAF (very carefully) myself? As opposed to purchasing a new one...

What is the TPS an acronym for?

__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)

David, as far as I know a bad MAF sensor would activate the Check Engine light. At least that was my experience with our 1998 E320.

__________________
Fred Hoelzle

TPS = throttle position sensor. Let me google that for you

__________________
Prost!

I would check the TPS....X2

__________________
Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership

X 2? As in yes YES check this part first?! I gather.

I don't really know how to "check" it - not too terribly savvy (or confident) checking voltages, etc...

I think I just need a really good, honest, independent mechanic that is very familiar with Mercedes-Benz, more specifically the 112 motor....!?

__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)

Is the MAP (Mass Airflow ? P=? <--just a guess) synomous with TPS?

__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)

No, the TPS is just the electrical connection between your foot and the throttle plate, converting mechanical movement to an electrical signal. MAP stands for manifold air pressure, and I think on your model it is integral to the MAF, which measure the real amount of air being sucked into the engine, since that varies with temp and pressure.

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Prost!

THanks... I am pretty sure that the MAF failure would definitely illuminate the MIL... so given the the MAF is still good....
Do you think the changing the TPS is a good starting point? Or should I have it checked first? I have definitely given this car a good run for it's money since I bought it outright in late 2006 with 47k miles on it (a least trade in).
Might it be a good idea anyway?

Thanks... I need all the help I can get.

__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)