ArMaNi S500

About several weeks ago I took my car for a quick drive to the pizzeria. 5 minutes later I go in my car and go to start it but it would crank yet wouldn't turn over. I tried several times with no luck. I waited a few minutes, just before I was going to have it towed and figured I'd try one more time, it started and I drove home. Now since then I've ran into this problem more and more frequently. Once it even stalled at a traffic light but luckiily started again 2 minutes after. It seems to usually stall when idle. Just now I started it left it idle to warm up and came back to find it off. Tried restarting and no luck. I know I did change the mass air flow sensor recently. I was incurring a rough idle even after. I don't recall ever changing the spark plug. I haven't exactly taken it for a tune up at the stealership but have changed the oil and brakes myself. If anyone has any advice for me I'd greatly appreciate it. I'm going to try getting the air filter re-oiled and possibly replace the spark plug but something tells me it's more serious than that...

winmaw

Hi,

Change back your old MAF and try to see what will happen.

RobertG

the O2 sensors can cause stalling the no start can be a bad starter since you said that it won't crank ,also can be your ignition key.Get it checked out before the car stalls in a dangerous situation and you or your passenger get hurt.

ArMaNi S500

But I've been running on this new MAF sensor with no trouble for a few months now. All of a sudden it's been slightly rough at idle to now now even turning over or not remaining on.

ArMaNi S500

Is the 02 sensor a different sensor from the mass air flow (maf)? Also, my car actually does crank but won't turn over. Although just this morning I started the car, let it run for a couple mins but it then shut off on its own. Tried starting again but won't turn. Few mins later still wont turn over...

winmaw

From where did you buy MAF? is it a bosch or other? I suspect it is the main problem. do you have a CEL "ON"?

Vader55

how many miles ?

ScottCLS55

I'd bet on the CPS(cam position sensor) When they go bad the warm up and lose resistance. Common problem on V8 engines. I had one do it at(with 53k miles) dairy queen once. The part is like 69 dollars with a discount. It is easy to change.

Good luck,
Scott

ArMaNi S500

I think it was either brand new owm bosch or rebuilt to new. But my guess is new. Don't see any problem lights or messages on the instrument cluster...?

ArMaNi S500

it has 81,xxx miles. thanks for the tip willyws. i'm gonna just buy that part and give it a try. do you suggest a place to buy it and maybe know how to install it? did you have any notification on your guages? thanks

Vader55

If you have not changed your plugs do it ! Even if it is not causing your current issue.. I did my plugs at 70 K and they looked like hell ! They really needed to be replaced. My buddy who owns a Benz repair and is a tech was suprised how bad they were too. I think MB does not recommend plugs t'll a 100 K but I would never wait that long.. Pull 1 plug out a have a look ? This is good advice for all.

apricotscrub

You should probably take it to a dealer and get the problem diagnosed immediately, b/c a few weeks down the road, you don't want to be stranded and have the entire day dedicated to a piece of metal with an engine in it, you'll probably be charged a lot more if you wait.

ArMaNi S500

Ok I took it to my friend at a dealership of a comparable company and nothing showed up on the scan. He narrowed it down to the crankshaft sensor (which is what I've been told could be it) and the fuel pump. I just bought the sensor for $70 and now need to install it. Could anyone offer instructions on how to do the job? I did a MAF sensor change which was easy so I hope this'll be the same. Thanks in advance !

mike_t

just had the same problem with my 2000 s430. i ended up paying the dealership $400 (after my extended warranty coverage) for the crankshaft position sensor. the service dept did bunch of tests, fuel pump, engine "stuff", the then the crank sensor failed under heat gun simulation. i had a post at the "other" forum and someone replied the same where the crank sensor will fail under heat when it goes bad. hope all goes well with your install.

ArMaNi S500

I finally put in the crankshaft sensor (which I found on eBay for a mere $70) and it seems to be doing the trick. Thanks for everyone who helped out and good driving.

ScottCLS55

Damn, one month without your car.. How did you manage?

Glad you got it going again!

asim0606

I am having exactly the same symptoms. Just want to know if it was "Crank Position Sensor" or "Camshaft Position Sensor"? Both of them are about $70.00. Scott suggested "Cam Position Sensor" and you replaced "Crank Position Sensor"? Just need calrification. Thanks for any input.

Asim

AH1W-COBRA

isnt it crankshaft position sensor?answered.

whoover

The car has both. The hot stalling problem is normally caused by the crank position sensor.