dacollector

ok, so i am backing up into my garage, i stop the car. noticed that i needed to go back a little more, so i started the car, as the car starts, i am pressing the brake and ingage the shifter reverse, there is a slight high pitch sound, and i turn off the motor. i restart, i noticed the engine is rocking back and forth, very rough idle, it's like the engine starts to die, then it would idle up high, then down, then high, then down and finally dies. i tried to start again with the same result. there is no check engine light and or errors on the intrument panel. what is wrong? how to fix?

SkiMiester

https://mbworld.org/forums/e-class-w...ml#post4733651

SkiMiester

Click this link...https://mbworld.org/forums/e-class-w...ml#post4733651

dacollector

thanks ski mieser,
i checked that, it wasn't that, it seems like the timing is off ??, and or not all cylinders are running? could it be the crank position sensor?

SkiMiester

I was going to suggest the CPS but usually the car would not even be able to be driven.

Try the Techron Concentrate.

(not sure if you meant you tried that, or the Air Duct connections)

cheers!

dacollector

thanks ski mieser,
i also think that when i started the car the 2nd time to reverse, i might have been too quick, and had it in gear while the car was trying to start and idle which might have cause the timing to be off? so CPS then?

SkiMiester

Don't think so...but anything is possible.
Are you out of Gas...(just checking)
Good Luck.

dacollector

thanks ,
but the sad truth, was that i just filled it up, the other day, and just pulled it out the garage to wash it, then while puting the car back in the garage, is where this happens... can't think it might be the CPS though?

SkiMiester

Here is the part if you want to try it yourself.

http://www.autohausaz.com/search/pro...196@Crankshaft Position Sensor

SkiMiester

Pics for DIY

https://mbworld.org/forums/w211-amg/...-diy-pics.html

dacollector

thanks ski miezer,
also would you think that it's the egr valve? the engine is rock'n like i got a full blown hemi under the hood...Lol, i feel it's timing. also i hear a loud hissing sound????

Taylor-Made'90

Doesn't sound like CPS. When mine went bad, the car wouldn't crank at all.
Mass airflow sensor maybe??? But that'd throw codes. Your 'check engine' light isn't on, right?

dacollector

yup, the "check engine" light is not on, and there is no error codes on the instrument panel. due to the hissing, could it be a broken vacuum hose somewhere?

dacollector

well, checked all vacuum lines that i can see, and all seem ok... it starts ok, but can't idle, it would be very very rough, then it would die. i don't think it's driveable. could it now be the CPS?

ndasgruv

I say CPS, my cousin had similar problem. Car died, wont start, let it sit for a while, and runs fine then stalls. Replaced the CPS and all's good. I believe he has around 120k miles on the car.

dacollector

thanks jdasgruv,
but what would have caused the screaching sound? like the belts slipped? i may just go out and buy that part as more than enough have said it was that. thanks

dacollector

well, finally got around to changing the CPS, and did the proper indexing, and still have the same problem. it shakes, during idle, then seems like the computer is trying to compensate,as the idle would rev up, then down, then up, then dies.. start it up again,and same problem...

SkiMiester

Hmmm...Maybe a Fuel supply issue...clogged Fuel Filter?...did you try the Techron Concentrate. Remember I had a similar problem...felt like it would stall at Idle...used the Techron as the Dealer suggested and Bingo problem solved for $15.

ndasgruv

Screeching noise could be the tensioner pulley or the idler pulley going bad. But I don't think that would be the cause of your idle problem. Bad coil pack could cause ruff idle, should show up as a trouble code.

This might sound like a strange question. Do you have a fuel cap on the car, is it tight? You did say you washed your car?

dacollector

started to look for a vacuum leak, no such luck, then as i looked under the engine bay, i see this? is it part of the car?

vettdvr

I have had one fail and it would run with no power. It is possible for a partial failure but normally they fail like a light bulb.

Arrie

Have your fuel pressure checked at the engine fuel rail. You could have a simple fuel pressure regulator or fuel pump problem.

When it runs or idles rough press the gas pedal and see if it just dies. If it does it probably is a fuel delivery issue.

dacollector

hi arrie,
thanks for your input, as the car idles, i press the gas, get it over 2000rpm, it seems to run/sound normal, every now and then, it would drop the rpm and seem to want to stall, so you maybe right. but also, there seem to be a unusually louder hissing sound as well that i can't pin point where it is coming from.

dacollector

so i finally got it checked out, put on the star diagnose, no error code, then they took off the plastic engine cover, and by the hissing sound from the back of the engine, there it was, the intake manifold warped and causing air to go into the engine (hissing sound ) due to corrosion, which he said is common based on the milage i have... wow, shouldn't this be a manufacuters defect?

vettdvr

COMMON Intake Manifold failure! Wanna buy a bridge. The intake should not fail. If it is a composit plastic type it might crack but not corrode.