Mercedes-Benz Forum banner

1 - 8 of 8 Posts

·
Registered
'95 E420
Joined
·
106 Posts
Discussion Starter #1
i searched but couldnt find an answer. can someone help or explain?

i just got back from spending a week in Texas visiting family. this morning, i loaded up the kids for school and when i pulled out onto the street, the car sputtered, had low idle while in gear, and no power. and yes it was at cruising temp. later, My Beloved Menz actually stalled on me once. MY MERCEDES STALLED!!! [B)] the inhumanity!!!

it was like this for several miles. finally i was able to get on the freeway and open it up a bit. after i got off the freeway and returned to normal streets, it was all back to normal. idle, power, normal.

does anyone have any answers or solutions to avoid this in the future? this is the longest i have gone without driving it in one period. usually i will go 2 days max without driving it, so this has never really been a problem before. thanks all...
 

·
Registered
500E, E320, 190E, E55
Joined
·
1,006 Posts
Slide valve/Throttle body and or HFM/hot wire unit is failing. M119 engines are known for this part to fail with some regularity. Usually high mileage motors.
Have engine properly scanned with MBZ Star laptop or equivalent MBZ/LH injection compatible diagnostic tool. If there is a problem with either one it will show a stored code.
 

·
Registered
Depends on the day!
Joined
·
13,337 Posts
redwood is correct...very common item, loves to fail and I sell quite a few. I Beleive MB is actually remaning the slide valves at this point. Also, the engine room harnesses like to fry on that car as the mileage gets around the 100K mark.

Have the codes pulled and let me know if I can help in any way!

Jonathan
 

·
Registered
2006 S500 AMG Wifes Rig Hillbilly Girl 02 ML320
Joined
·
2,332 Posts
Not sure if this related or not, but every once in awhile sorta like the other day, I got ready to leave and when I cranked it over it just started to what sounded like backfiring back through the intake and popping in the exhaust! The car was parked on a incline in front of store had full tank of fuel and I had changed the fuel filter this summer. I let the car roll back onto level ground tried to fire it up but it took me about 20 min to finally get it fired! It has been running like a fine watch since then but I know down in my bones it is gonna do it again. I get no indicator lites and when I check the led fault ind there is nothing? I am at the end of my rope !! Any ideas out there? The car has 132k and as far as I know most likely has the orig harness! I looked at some of the wires on the harness and it looks in good shape no sign of brittleness or cracking .


Smokie [V][V]
 

·
Registered
'95 E420
Joined
·
106 Posts
Discussion Starter #6
redwood - 2/23/2005 4:08 PM

Slide valve/Throttle body and or HFM/hot wire unit is failing. M119 engines are known for this part to fail with some regularity. Usually high mileage motors.
Have engine properly scanned with MBZ Star laptop or equivalent MBZ/LH injection compatible diagnostic tool. If there is a problem with either one it will show a stored code.
MBZ Star laptp? whats that exactly? it sounds like something i will need to take to the dealer. true?

as for the slide valve, what and where is it? i can not find anything in any of my books about this. i looked at Performance Products for price (just in case) and i could not find it. assuming it will need to be replaced, is this something i can do myself?
 

·
Registered
500E, E320, 190E, E55
Joined
·
1,006 Posts
No, this is a repair best left to MBZ techs. Slide valve is just MBZ word for THROTTLE VALVE/BODY
It is in the center of the two piece intake manifold.
Air is metered by the hot wire before it enters the main intake(slide valve) This repair requires disassembly of the intake manifold (very involved for the novice) Yes you are right, Mercedes shops are the only ones with this type of specialised diagnostic tools. You can have the engine scanned by using a cheap scanner and an adapter but it is not advisable as you will have to decipher codes rather than read a description. It doesn't cost very much for a code check. When engine revs drop very low to the point of stalling the engine when backing up or going forward at low speeds, you definitely will need this part.
 
1 - 8 of 8 Posts
Top