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#1
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Starting problem with test results:
Ok, here it is:
Starting problem occurs as follows: A) Only after sitting for several hours B) The starter will turn and engine will crank over and over and sometimes will fire, but immediately shut down, and sometimes will not fire at all, but just keep turning. C) The DAS light blinks when I insert and turn the key D) After 3 attempts the car will start and run fine and start fine for the whole day. E) The problem will repeat itself after sitting for a while. So far I've changed the Crankshaft position sensor. Is this the same thing as the camshaft position sensor ? excuse my ignorance So what do you guys think? |
#2
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Fuel pressure bleed-off??!! would hook-up guage & watch for complete bleed-off.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#3
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Thanks MBDOC - but I'm a little bit of a dunce when it comes to this - what do you mean by fuel pressure bleed off? Do you think I filled up with a bad tank of gas? Should I try fuel aditive/cleaner?
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#4
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When the engine ISN'T running there is a residual pressure that the system must hold for the injectors to inject fuel when you try to start the engine.
Otherwise the fuel pump must be activated several times to re-build that pressure....fuel filter & pump have check valves to hold that residual pressure.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#5
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So, another diagnosis point:
When I turn the key to position 2 and then back to 0 and repeat it 3 times, the truck starts fine.... |
#6
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Each time you turn the key on the pump runs for a second to help re-build residual fuel pressure..again fuel bleed-off is the most likely problem...how old is the fuel filter?
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#7
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Quote:
Should I ask them to just change the fuel filter alone? |
#8
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Okay, so here were my symptoms: (someone please add this to a sticky somewhere - wolfgang you may want to add to your site:
A) The car would have a hard time starting when left off for more than a few hours. B) I looked for the little red LED to flash (by the Low Range switch) when I turned the key C) If I left the key in position 2 for more than 30 seconds, and then cranked, she would start right away. What that simple procedure did was immediately rule out: 1. DAS (Driver authorization systems) 2. Battery 3. Crank Shaft Position sensor. So the only thing left was the fuel delivery system. As MBDOC and others pointed out - the most probable cause was the check valve integrated into the fuel filter unable to maintain fuel pressure after I leave the car off for several hours. When I turned the key to position 2 it activated the fuel pump and re pressurized the rails. 2 tankfuls of Techron DID not help.... So I went to my trusty dealer and of course because my ML is a 1999, I cannot just change the fuel filter. In 2001, when they changed my fuel sender, they put in the OLD system!!! I had to update the pump and the lines. Total cost parts and labor was around $1030 - VERY reasonable in my opinion, and best of all SHE'S ALL FIXED!!!!! and STARTS LIKE A DREAM. Here are some advantages of having done this fix: A) She pulls VERY STRONGLY off the line, and there is ZERO delay in passing from 55mph to 90mph - just keeps PULLING AND PULLING B) ANY hint of a slight rumble at idle after a hard run is GONE C) Fuel economy is up. Thanks everyone! |
#9
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Starting my 1999 ML-320 needed a spare key
Quote:
Question: Why did this happen and can a re-synch procedure fix the offending key? Please help explain any of the items I discussed because I can't find the answer via Google. Thanks in advance, Chance please cc cneale@panix.com as well. |
#10
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do a search on DAS and key ring transponder on this forum.
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