Leo100

Hi my name is Leo
I have a 2000 ml320 my SUV cranks but does no start.
I changed the crank sensor and the cam sensor but I still can not start it please i need help

thank you

hardybill

I had the same problem and it turned out to be the key. I know it sounds dumb but a key with a bad chip will crank, almost start but not run. It was a case where I pulled into a parking space for just a few minutes got back in and no start. Hope this helps.

mihir_d

It could be the fuel pump.

The Crank Sensor and the fuel pump failures have identical symptoms. Crank, crank - no start..except that the CPS failure will cause the engine to start when dead cold.

You could also be getting cylinder misfires, which could mean foul spark plugs or bad ignition wires..

How many miles on the ML? Were the plugs/wires replaced at 100K miles?

Lastly, was the fuel filter replaced between 60-75K miles? A choked fuel filter could also cause the same symptom..

And also, as mentioned above, the key could be a cause of it too..

nougla

Hi Leo I have the same issue please update what happened? Thanks in advance.

rhinoman56

Did you change out the key or take it to dealer?

hardybill

It was under extended warranty at the time and had it towed to the dealer. It was embarrasing at the time to find out it was just the key but I would never had thought that a key would act that way. The dealer programed a new key and all was well.

SofaKing

try the crank sensor.

Racerx18691

is the fuel filter accessible enough to change myself? if so, please tell me where it is located. thank you!

LeviDenim

You are going to hate that job.
It is behind the driver side rear fender liner. Do you have the updated filter already? If not
you will need the new filter and new fuel lines that come with it.
Also to do this the rear seat has to be unbolted at the rear and tilted forward in order to
access the fuel pump where the fittings for the new lines go. I can get part numbers and
probably post a diagram. Autohausaz.com had some of the better prices I have seen for
OEM stuff on the fuel system.
It should be a different thread than this however. We are going off topic.

Racerx18691

thank you. a diagram would be great if its not too much trouble. I HAVE to do it myself cause I cant afford to get raped by the dealer again LOL

LeviDenim

What year is your ML 430? Also need to know if the fuel filter is the original one or the updated one. You can tell by looking at the back of the filter that points to the back of truck There will be a cylindrical pressure regulator on the end of it.
You will have to pull off the drivers rear wheel to lift up the edge of the wheel arch liner to get a good peek at the filter.
Then I can post the correct lines if needed. If it is the updated one then you just need the filter and do not have to access the top of the fuel pump/sender under the back seat. Also you save money on the fuel lines.

Racerx18691

it is a 2001 ML 430. I bought the piece of crap CPO so I dont know if it is the original. My back is hurting so I cant look at what you asked me to. Thank you for your help. From what I have heard it is MOST likely to be the CPS since it starts when cold. Would u agree? thanks

LeviDenim

It is such a cheap part and quick fix I would change the crank sensor first.

I hate to just throw parts at a problem, but in this case it could very well be the culprit.

dreeta

Hi , I have a 2000 ML320. I had the same problem as Leo100. I changed CPS and it worked fine for five months. But now after trying a few times to start it I finally did (changed the battery),it worked for a few minutes and then died....tried after two days , same thing. Please help ???

Racerx18691

u might have gotten a bad CPS. most warranties are for 12 months on parts. check your warranty and get a new part for free. to check the battery simply take it to an auto zone and they will check it for free. running it should be putting out about 14 volts.

dreeta

Racerx18691

Do you think that could be a CPS issue? The engine starts , works for a few minutes and then dies. Next try I cannot start the engine. As I mentioned, I tried after two days and the same thing happend??

Thanks for the post.

Racerx18691

as far as I know yeah. I need to replace my CPS as well. As far as starting then dying a few minutes later? Could be a failed or failing CPS, could also be the alternator, loose battery terminals. Test your battery first. Get a new CPS using the warranty from the person or company you bought the CPS from. Like I said if it is a reputable company they should offer 12 month warranty. Other than that, wait and see if you get any other or different opinions from others on this thread. You can call your mercedes dealer and ask to speak to a mechanic to give you their opinion. I have been told "we dont do that" I said "well you did last week so let me talk to a mechanic" LOL and they did. The bis question is, is it the CPS causing it to die. Shouldn't be the battery because it turns over and starts. Wait for others' opinion.

Racerx18691

when u ask them, u will need to tell them whether it happens when engine is cold, just been driven and still hot, just been driven and still warm, etc. On mine it only starts when cold.

dreeta

Well , I had a CPS problem five months ago, and they fixed it (changed the CPS-at least that's what they told me). Before changing the CPS I was able to start when engine was cold and drive it for a while till it got hot. But now , the engine starts and after 2-3 minutes engine dies. The mechanic told that this is a fuel pump problem(he tested it with some spray , I don't know what was that). Alternator could be the issue , because after I changed the battery it worked but died after a few minutes. I really don't know what to change first.I think that you all know when you ask a dealer for help they just want to change almost every part in the car.

Racerx18691

Yeah they sure do! Well, I do know that one way to test if it is the alternator is once the engine is running, remove one of the battery cables/terminals. If it dies, it is the alternator. This is what leads me to believe that it might be a loose, worn or damaged cable. Regardless, the CPS unit they installed for you might or could have been damaged, re-built or simply faulty. Since it should still be under warranty I would try that first, and ask them to save old parts so you can inspect them. Good luck!

festuskasonde

Hi gents, I got stuck this morning when my ML350 lost raves (RPM) and shut down. I tried to start it but couldn't. It cranks quite alright but will not start. No fault codes are present on the dash.... Please help

Maj. Dundee

Crank the eng. and watch the tachometer and see if the needle moves to at least 200 RPM's.

If it doesn't you will have to replace the Crankshaft Position Sensor.

RUBEN SERPA

hi, my 320 ml stars and after 1 or 2 seconds the engine stalls , this failure came out after i change the battery, i dont know what to do ,please give me some help

Maj. Dundee

Everything depends on how you changed the battery. If you left the key in the ignition while you removed and installed the battery cables, you might have toasted your key, ECM or AAM.

Think carefully as to how you did this.