My E55 has been running great but last night it cranked over untill the timeout but would not start. I tried it about 10 times and then it started and ran fine. The next night it did the same thing. I think I should try a new fuel filter unless anyone has some insight as to somthing else?
Car turns over but won't start
1 - 8 of 8 Posts
1999 E55, 2001 E320, 1990 560 SEC, 2004 ML350, 2001 ML55, 1995 S500, 1998 SL500, 2010 E550 Sport zoo
Joined
·
7,039 Posts
A couple of things..
Depedning on the mileage on your car, I would suspect what is called the "CPS" sensor (or is it TSP) which is like a $65 part as long as you have articulated hands and fingers to get in to replace.
This sensor is a consumable part, usally shows going bad when the engine gets warms, engine cuts out, the can be restarted right away.
However, when it really goes bad (or has been replaced by a China knockoff part) then it can show the same problems you exhibit - engine won't start, won't start, then starts and runs fine.
If it was a fuel filter, then yes the engine will be hard to start, but the engine would run rough or not run well.
The 1st place I would start is to call free Roadside Assistance (when it doesn't start) and have them come out and diagnose for free rather than driving it and getting stuck somewhere.
For "cps" replacement, I think there should be a sticky.
Fuel filter change is even a easier DIY, I choose to replace the crazy MB hose clamps with standard, should also be in the stickies but make sure you get a OE (not no brand China) fuel filter for the replacement.
Keep the faith !
Depedning on the mileage on your car, I would suspect what is called the "CPS" sensor (or is it TSP) which is like a $65 part as long as you have articulated hands and fingers to get in to replace.
This sensor is a consumable part, usally shows going bad when the engine gets warms, engine cuts out, the can be restarted right away.
However, when it really goes bad (or has been replaced by a China knockoff part) then it can show the same problems you exhibit - engine won't start, won't start, then starts and runs fine.
If it was a fuel filter, then yes the engine will be hard to start, but the engine would run rough or not run well.
The 1st place I would start is to call free Roadside Assistance (when it doesn't start) and have them come out and diagnose for free rather than driving it and getting stuck somewhere.
For "cps" replacement, I think there should be a sticky.
Fuel filter change is even a easier DIY, I choose to replace the crazy MB hose clamps with standard, should also be in the stickies but make sure you get a OE (not no brand China) fuel filter for the replacement.
Keep the faith !
If you want
You can bring it by and I'll get codes for you. I'm in Laguna Niguel/Aliso viejo area. I've been looking for someone else in the area with a w210 e55 to compare rides with. Mine has been making a clunking noise when accellerating/decel almost like the spare tire is loose (but it's not) only when the car is cold.
PM me if interested.
You can bring it by and I'll get codes for you. I'm in Laguna Niguel/Aliso viejo area. I've been looking for someone else in the area with a w210 e55 to compare rides with. Mine has been making a clunking noise when accellerating/decel almost like the spare tire is loose (but it's not) only when the car is cold.
PM me if interested.
CPS is a DIY
I agree with Fabbrisd1 that it sounds like the Crankshaft Position Sensor (CPS). Mine went out and exhibited the symptoms you describe. It's a DIY in the Sticky section. However, it's a little tricky in that you have to do it by "feel" since you can't see the CPS when you are taking out the old one and mounting the new one. The DIY post in the sticky section is for an E420, so I had the parts guy at the Benz dealer give me a printout of the E55 schematic when I picked up the part. They also gave me a bit of "goop" to put in the torx bit to hold the torx bolt in it. This was very helpful when re-installing the new CPS since you are working down under/behind the engine and it's hard to get both hands in there at the same time.
Lawrence1, I'd be interested to hear more on your diagnosis for Southo. I have the same clunking noise now that it's getting a little cold here in Phoenix. Do you know if there are pics/DIYs on this topic?
I agree with Fabbrisd1 that it sounds like the Crankshaft Position Sensor (CPS). Mine went out and exhibited the symptoms you describe. It's a DIY in the Sticky section. However, it's a little tricky in that you have to do it by "feel" since you can't see the CPS when you are taking out the old one and mounting the new one. The DIY post in the sticky section is for an E420, so I had the parts guy at the Benz dealer give me a printout of the E55 schematic when I picked up the part. They also gave me a bit of "goop" to put in the torx bit to hold the torx bolt in it. This was very helpful when re-installing the new CPS since you are working down under/behind the engine and it's hard to get both hands in there at the same time.
Lawrence1, I'd be interested to hear more on your diagnosis for Southo. I have the same clunking noise now that it's getting a little cold here in Phoenix. Do you know if there are pics/DIYs on this topic?
I bet my money on the CPS.
i dont want to go off topic too much in this thread but i do know that those flex discs are a wear item and when they become cracked you get clunks when going on and off throttle there could also be other causes for this but these are the first things i would check since they are easily visible if you get under the car.
you can always start a new thread so we can troubleshoot it easier and avoid confusion with the CPS failure symptoms illustarated by the OP.
you can always start a new thread so we can troubleshoot it easier and avoid confusion with the CPS failure symptoms illustarated by the OP.
Thanks to everyone for the advice. I replaced the Crank Position Sensor (CPS) and it is fine now.
FYI Just a little hint I removed the MAS and the Intake elbow and it was easy to get to the CPS from standing on the passenger side of the car.
FYI Just a little hint I removed the MAS and the Intake elbow and it was easy to get to the CPS from standing on the passenger side of the car.
1 - 8 of 8 Posts
