gogomomo72

Good day All :

Can some one please assist me ?

I have a 2008 S-550 ..Few days ago I was driving ..Stooped for a coffee
Then I try to start the car and it will not Crank !!! all the lights are on .

I tested the front Battery and the back and they show Strong Voltage !!
I Tap'd on the Starter and try to start but no luck !

Mercedes Dealer did scan and it show'd nothing wrong !!
I am Scared if it the Engine seized ... that's a lot of Money but if it did .. it should Crank !!

Also ...Could it be a fuel Issue ??

If we change the Starter and it is still not cranking , what shall I do ?

Thx

Mike5215

What was the resting voltage of the front battery?

gogomomo72

In the 13th ! If I can remember right !

evansw220

The starters usually goes bad.. You could check to see if the engine spins from the crank pulley(if you have tools available to you).. Also be sure to check the starter battery(up front) and auxiliary battery(trunk behind the back seat)...

dannieboiz

my car did the same thing when the front battery died. Freaked me out then someone here told me to replace the front battery so I did. Works like a champ.

See if you can jump start the car from the front terminal to confirm.

gogomomo72

We did check both Batt's and they are good !! Today I will change the starter , wish me luck .

My fear if it is not the starter what shall I do next ??

gogomomo72

Evansw220 :

You saying that it is common for the starter to go wrong ? , man that would be great news , I going to change it today regardless because that is my only hope.

evansw220

Yea they are... Also other signs that they're bad , it keeps popping the starter fuse due to internal failure..

Mike5215

Not enough. 14.6 range is good. Amp draw on a W221 at start is huge. You can still have enough power to run accessories and lights on a weak battery.

Atcpup

My resting voltage on a brand new front battery is 12.5 and it starts strong...

T0ked

My 2007 S was still on its original battery up until a month ago. When it died, I had the same symptoms. Lights are on, but no crank, not even a peep. I took the battery out and charged it up, still no go. Only a jump or replacing it solved the issue. If your battery is older than 3 or 4 years, I'd replace it first before jumping to the starter as an issue.

bWo

same thing happened on my f150. Lights would come on but not crank. Charged the battery to full and it started. Turns out the alternator needed to be replaced.

Joe Ruiz

how do I know if engine didn’t seize

joseluu

I don't think you are ever going to get 14.6 V at rest from any battery.

It is a rare occurrence and it always happens while the engine is turning.

I am one more of those who has seen everything light up, no crank, new battery, all solved.

Elbalt

most likely your crankshaft sensor. Less that $40 to replace

dlafever

The easy way to figure this out is remove the spark plugs and put a 27mm socket on the crank pulley, turn the engine over by hand. If you can do that, it has not seized.

Elbalt

07 S550 fuel pump fuse keeps blowing up and starter keeps locking up too. No crank or starts. Please help .

Simonas.st

Have You tried to hold key in start position for a bit longer, than usual?

Elbalt

so, I replaced the starter and the fuel pump about a week ago, fives days later while trying to start the car, no crank no start. I noticed the fuel pump fuse, the 30a fuse at the back seat was blown. Replaced the fuse and blew again as soon as I tried to start the car. Towed to the mechanic, he said I will need to replace the starter again, because it burnt out again, and also, I will need a new fuel pump and now a fuel filter. He said he noticed the fuel filter at the left back seat was clogged up.

folks does this sound about right ? Can a clogged fuel filter cos all these problems? All relays looks good.

personally, I don’t see the correlation of the starter with the fuel pump or the fuel filter. Please help. Let me know what you guys think .

Simonas.st

So it did worked 5 days, after You replaced starter?

Elbalt

yes, the car worked perfectly for five days after I first replaced the starter and the fuel pump. Then, the car wouldn’t start again. Same exact symptoms from the first time. No start, no crack. Also worth mentioned, I had to replace both car batteries ( front and back) a week ago too.

Simonas.st

For me it sounds like electrical problem. You have some short circuit if it keeps blowing fuses. Unlikely that starter would burn that easy.
How handy You are Yourself?
I was always getting bull**** diagnostics at the dealership, so decided to repair it myself.

Elbalt

I’m not that handy. You won’t believe this. After the mechanic fixed the car for the second time within two weeks, I had to replace the starter(Used) and fuel pump(brand new) again and also replaced the fuel filter/ sending unit (brand new) also replaced the rear SAM this time around. Car drove fine for four days and this evening, the car won’t start or crank over again. This just happened today. It’s dark outside now but I will check in the morning to see if the same fuse 30a for the fuel pump is blown again. But for now, all interior lights coming on when push button is pressed just no crank and no start.


please, if anybody have any clue what else to do. I’ve spent roughly $1,800 for parts and labor in the last two weeks. Please, help. What can you think off to be going on? Seems electrical/ circuit shorts??

augu

did you find the fault?