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, my C240 wont start just changed out the plugs cranks…

Customer Question
My C240 wont start...

My C240 wont start just changed out the plugs cranks but wont start, 1/2 tank of fuel and has I keep cranking I smell fuel

Submitted: 2 years ago.Category: Mercedes
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1/31/2016
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago
Lou P. master tech
Lou P. master tech, Mercedes Technician
Category: Mercedes
Satisfied Customers: 6,013
Experience: 20 years Master Certified excellent fix rate and have access to factory wiring, and instructions.
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hello , did the issue happen after you changed the spark plugs?

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Customer reply replied 2 years ago
No, I parked the car over night and it ran fine that day. In the morning it would not start. I checked the battery and even tried to jump it with me truck battery. ((One note with that was the negitive cable got vey hot after several attempts to start). I changed the plugs made sure all the connections were solid and tried to start it but nothing engine cranked but did not turn over. I also smelled fuel after trying to start it several times.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok thanks for the reply. So does the car crank fine but it just will not catch and start ?have you tried starting fluid to see if it would start ? How many keys do you have ? Have you tried them all?

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Customer reply replied 2 years ago
One key will try starting fluid today and let you know.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok, also pull one plug out and check for wetness. That would determine if fuel is spraying or not. And if we have spark or not. Also did you fill up fuel recently before this happened ?

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Customer reply replied 2 years ago
car has 1/2 tank of fuel. I will pull a plug and check. I'll get back to you in a little while.Thank you.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

No problem. What I meant was did you fill the fuel right before this happened ? To make sure it's not a case of bad gas.

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Customer reply replied 2 years ago
Pulled plug (looking at the engine on the left side 1st plug) it was wet. Can't really tell if it sparked, I would say no. My nephew is bringing a diagnostic tool to read codes. I'll let you know.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok. Hopefully the scan tool can read values. We need to know if the crank sensor is working.

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Customer reply replied 2 years ago
Ok no codes and it's not sparking.
(Using a Auto Link A519)
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok sounds like crank sensor. You will have to access and replace the crank sensor that would be what I would check first. Unless the scanner can read data then we need to read the rpm as it cranks.

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Customer reply replied 2 years ago
I believe it can read the rpm data it has a live data module.
Customer reply replied 2 years ago
Ok just ran test. RPM in cranking go 150-160.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok crank sensor is good. Now check all the fuses in drivers side engine bay fuse box.

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Customer reply replied 2 years ago
Ok checked all 18 fuses all are good
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok , unplug one of the ignition coils and check the wires. There should be 2 powers and 1 ground. I'll have to verify but check a few coils.

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Customer reply replied 2 years ago
There are 3 yes. And I have a voltage meter ready.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok I'm checking the diagram now.

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

What is your vin

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Customer reply replied 2 years ago
WDBRF61J34F50785
Customer reply replied 2 years ago
504785
Customer reply replied 2 years ago
Missed the 4
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok great thanks. One second.

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok the middle pin is key on power. So make sure you check with the key on. It's also power that comes from fuse 48 in the fuse box.

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Customer reply replied 2 years ago
Ok how many volts am I looking for?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

The outer two wires are also voltage but only when cranking. You are looking for 12v or greater on center and any kind of voltage on outer ones when cranking.

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Customer reply replied 2 years ago
No voltage on crank and almost nothing from middle power. Very low reading. .05 v meter is set to 20 v max
Customer reply replied 2 years ago
Fuse 48 - 15 amps is good.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok , and the fuse has power ? Being good and having power are two different things

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Customer reply replied 2 years ago
Let me check.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok I have to leave for a few minutes. I'll check back asap

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Customer reply replied 2 years ago
No voltage. :(
ignition is on
Customer reply replied 2 years ago
Could this be a battery problem? I keep jumping with my jeep, and a battery jumper. Jeep battery at 14 v and the Benz is at 12v but dies after a few starts. However not with cables connected to my jeep.
But I guess I with my truck connected the battery I should have gotten voltage at the fuse.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Oh ok so the fuse does not have voltage ?

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Customer reply replied 2 years ago
no voltage on either side of the fuse
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok check for negative then

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Customer reply replied 2 years ago
Negitive?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Yes. Flip flop your lead from ground to a positive source and that means you are testing for negative or ground.

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Relay P is the one that activated the circuit for that fuse. I'll get you the location.

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago
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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

I will submit a offer for a phone call as the next couple of steps will be hard to type out.

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Essentially we need to determine if the relay is bad or if the module is not activating the relay.

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Customer reply replied 2 years ago
Hold on.
Jut checked all the fuses
# ***** no voltage
#48 11.25 v
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok checking for what it is

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Customer reply replied 2 years ago
11.55v at the plug to the coil.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Yes 52 is also controlled by that same relay circuit

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Customer reply replied 2 years ago
11.55v on the plug going to the coil. No cables hooked up for a jump.
Customer reply replied 2 years ago
Still not starting.
Customer reply replied 2 years ago
All the fuses in that bank have 11.55v except #52 the first one.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok pull the cover off of relay P and you will be able to squeeze the contacts closed and see if it starts while the relay is closed.

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Customer reply replied 2 years ago
Ok give me a few with that.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Go for it. I have to break for a while. Family time. Wife says take a break 😉

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Customer reply replied 2 years ago
Lol ok.
Customer reply replied 2 years ago
Ok relay is working when I started the car it engaged the contacts. Only fuse # ***** did not have power all the others were just under 12 v 11.55 etc.
then the battery went dead again. Will have to charge it up again tomorrow.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok so check the terminals inside the fuse box at that fuse. Make sure they are not burnt. Maybe the fuse terminal melted or got weak tension. Do you know how to ohm ?

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Customer reply replied 2 years ago
It's dark right now going to have to pick this up tomorrow. The fuse block Looks good when I was pulling the fuses to check them. Can't understand why them at one fuse has nor voltage. #52
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Did you physically activate the relay ? Or see it activate ?

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Customer reply replied 2 years ago
it did, my wife was starting the car and when she turned the key it activated.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok I'm going back over the diagram. Something doesn't make sense.

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Customer reply replied 2 years ago
Fuse 31, 52 and 57 are start enable
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Fuse 48 check fuse 48.

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Customer reply replied 2 years ago
It's has 11.55 v
Customer reply replied 2 years ago
My car is a c240 2004.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

52 is for the starter and will only have power when cranking. If there is power at fuse 48 then we should have power at the coils center wire.

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

I think we strayed too much onto the starter circuit. We were after coil power.

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Customer reply replied 2 years ago
that we do the coil connector center feed is 11.55 volts
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok then when cranking the outer wires will display a voltage as they are fired.

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Customer reply replied 2 years ago
is that voltage to low, and when I hook up cables to jump I get no power on the center pin.Ok I am going to have to check that
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok if the voltage matches the battery voltage it's fine. It's possible the jumper is too much power so the control unit is not activating circuits as a protection.

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Customer reply replied 2 years ago
Ah ok. So I have to charge the battery. What should be the normal voltage.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

12.6 -12.8 is normal battery voltage.

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Customer reply replied 2 years ago
Is the 11.55 volts too low for it to start.
Customer reply replied 2 years ago
I'll try it tomorrow. Might be that the battery in NG. What else might it be?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

11.55 is not that low. 10 or under is low. So once we verify spark or coil activation then we may look into the fuel. Maybe the fuel is of poor quality

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Customer reply replied 2 years ago
I always get fuel at the same location, never had a problem, It did not seem that the plugs fired. But that's when I had the jumper cable hooked up to it, could have shut the circuit off as you stated. I'll charge the battery or get a new one and give it a go tomorrow.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

Ok. And don't confuse fuel octane rating with quality of fuel. Every once in awhile water or diesel gets mixed in.

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Customer reply replied 2 years ago
OK so I changed the battery, nothing.....Checked the pressure at the rail for fuel with my finger, good pressure, fuel shot out.Took out a spark plug and still no sign of a spark. The voltage at the center is 12.8 volts (New Battery)How can I check the coil pack? or see if voltage it getting to the plug?Thanks
Joe
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

if voltage is getting to the coils then they should be sparking, did you verify once again fuse 48? to see if it had power?

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Customer reply replied 2 years ago
I'll Check now
Customer reply replied 2 years ago
With key in the on position fuse 48 had 12.30 volts both sides.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok, good, then we should have voltage in the center wire of the coils correct?

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Customer reply replied 2 years ago
All center pins have 12.3 volts.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok good, then test the outer terminals as the engine is cranking, it should show something.

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

also, on the drivers side of the head, the wire that has the 3 plugs for the coils may be rubbing against the screw for the valve cover near the oil fill cap, verify the wiring is ok right there. the harness comes off the intake and has a bend and then goes back toward the coils, let me know if you see what i am talking about.

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Customer reply replied 2 years ago
Ok. Give me a few.
Customer reply replied 2 years ago
They show nothing no voltage.
Customer reply replied 2 years ago
Wiring harnes looks good on both sides.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok, do you have a scan tool to check for codes?

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Customer reply replied 2 years ago
I do and it can do live testing as well.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok, did we already check for rpm? i tried to read through our chat, also are there any codes now

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Customer reply replied 2 years ago
Ok.
Customer reply replied 2 years ago
RPM cranking was 150 -160
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok, does it show a cam shaft sensor value?

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

sorry this is taking so long, im trying to wrap my head around what is happening. cam and crank sensors are responsible for spark and fuel. seems like we are missing spark and the ecm should be activating the coils.

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Customer reply replied 2 years ago
No codes. What am I looking for. In the live test for the CPS?. Seems like it wants to start but just not getting there.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

dont abbreviate lol, what sensor you talking about?

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Customer reply replied 2 years ago
Ok. From the live test.
Short term fuel trim bank 2 sensor 1 = 0
Short term fuel trim bank 2 sensor 2 = 99.2Load PCT 88.5
ECT 55
Customer reply replied 2 years ago
Crank position sensor.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok for the crank we just needed to know it was picking up rpm, now that we know that rules that out. does it show a camshaft sensor value?

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Customer reply replied 2 years ago
Nope.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok....... unplug the cam sensor. its in the front of the passenger cylinder head. its a 3 pin plug. only one there.

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Customer reply replied 2 years ago
I know the Crank position sensor was changed. But never the cam sensor.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

ok, well if the cam sensor is faulty it can stop engine starting, but if its unplugged the car will bypass it so try unplugging it.

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Customer reply replied 2 years ago
Where is it?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

the front of the passenger side head

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Customer reply replied 2 years ago
Ok. It almost started.
But then a loud pop from the engine and now smoke coming from the manifold. Oh boy.
Customer reply replied 2 years ago
Looks like it back fired. Smoke is less but no burning smell smells like exhaust. Could be it was flooded?
I get a strong smell of gasoline when I try to start it. At least it did something. lol.
Customer reply replied 2 years ago
when I disconnected the cam sensor. Souls like it was starting and the pop. Lots of smoke. :(. Looks like someone cracked under the manifold. See pieces broken off.
Guess I have to take it all apart to see what's up.
Customer reply replied 2 years ago
Uggg this car is giving me fits.
Customer reply replied 2 years ago
looks Like the manifold exploded, what would cause that?.Ugggg OK have to change that now but I think the Camshaft sensor as well.
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

oh man, that does not sound good. maybe back fire or flooded with gas

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Customer reply replied 2 years ago
OK well its the hard way to find out, lol so I guess it was the camshaft sensor, other wise it would have done the same thing.So new intake manifold and new cam sensor
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 2 years ago

seems like it, man sorry that happened. you can find them used pretty easy to change as well.

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