Long Cranking Problem, Hard to start..
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05 c230k 6spd
^ Yeah thanks Matt the fuel filter has deff been changed and I doubt it defective since its been a few months and this cold start has been since its gotten in the 30s. Now how would I go about checking the pressure on the fuel pump. Where does the thing hook up to?
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From: Boston, MA
'14 ML350, '13 C220 CDI, '07 C280, '98 ML320
There is a port at the end of the fuel rail - you will see a small cap looking like the tire valve cap. Remove that cap and you can screw a fuel pressure tester on to that port.
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05 c230k 6spd
Is that the thing under the engine cover like where you release pressure for when your'e changing the fuel filter?
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05 c230k 6spd
I just had the Camshaft thing done at the dealer since they were leaking so thats all good now and the car is still starting hard everytime I turn it on. It always takes me like 3 tries to get the car to run. Here is a video of me starting the car. Its been fully warmed up prior to this, only turned it off for few min to get something in the house.
It takes this long everytime and sometime I have to crank it 3-4 times.. Been like this for over a month since the temp dropped.
It takes this long everytime and sometime I have to crank it 3-4 times.. Been like this for over a month since the temp dropped.
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or, put the key in ignition turn to position to 2 (don't start), hold the key there for 3 to 4 seconds and let the fuel pump pressurize the system, then try starting the car. See if that helps.
Last edited by pcy; Jan 13, 2011 at 08:37 AM.
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From: Camas, WA
2007 C230SS; 2014 ML350 BT
I just had the Camshaft thing done at the dealer since they were leaking so thats all good now and the car is still starting hard everytime I turn it on. It always takes me like 3 tries to get the car to run. Here is a video of me starting the car. Its been fully warmed up prior to this, only turned it off for few min to get something in the house.
It takes this long everytime and sometime I have to crank it 3-4 times.. Been like this for over a month since the temp dropped.
It takes this long everytime and sometime I have to crank it 3-4 times.. Been like this for over a month since the temp dropped.
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From: Camas, WA
2007 C230SS; 2014 ML350 BT
Battery voltage is 12.29V, so I am going the leave the car on trickle charge all day, while I am at work, and see what happens. I am going to stop and get a new CPS, as I suspect that may be the culprit.
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2007 C230SS; 2014 ML350 BT
Agreed, but it seems sometimes these cars are a little picky about voltage. I know it has started in the past with even less voltage with no issues. Surprised my only 4 year old battery is that low though
Picked up a CPS at the stealer, $50 later.
Picked up a CPS at the stealer, $50 later.
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It might be that low due to all the starting attempts, no? Doesn't it cycle the starter for 15 seconds each time to try? This would be the first CPS failure of a 07 I've read about on here, but you are at unusually high mileage over a lot of the others. What are you at now?
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From: Camas, WA
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It might be that low due to all the starting attempts, no? Doesn't it cycle the starter for 15 seconds each time to try? This would be the first CPS failure of a 07 I've read about on here, but you are at unusually high mileage over a lot of the others. What are you at now?
Yep, I may be the 1st 07 C on here with a bad CPS, but I see failures on other models of similar mileage.
I am just shy of 83K miles now.
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05 c230k 6spd
Hey, No I havent had a chance to fix it yet, I've been pushing my luck and driving the car like this. It never fires up on first try for me anymore, 2 or 3 cranks later it starts and off I go. I don't think its anything with the engine more like something ignition or fuel related. My battery is fine too. So you are saying a new CPS fixed your problem John?
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From: Camas, WA
2007 C230SS; 2014 ML350 BT
Hey, No I havent had a chance to fix it yet, I've been pushing my luck and driving the car like this. It never fires up on first try for me anymore, 2 or 3 cranks later it starts and off I go. I don't think its anything with the engine more like something ignition or fuel related. My battery is fine too. So you are saying a new CPS fixed your problem John?
Charged the battery all day yesterday, and took it off the charger last night. Voltage this morning was 12.89V and the car still wouldn't start, so battery is not the issue.
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2007 C230SS; 2014 ML350 BT
Before I replace it, I am going to double check fuel pressure. My buddy that borrowed my fuel pressure tester is dropping it back off today.
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John, I have replaced the CPS on my '07 C280. I removed the air filter assembly, then MAF, then the plastic elbow that comments MAF to throttle body. Once those parts were removed, I could see the CPS connector while standing next to the battery and looking towards the CPS area. Standing near the battery and putting the left hand from the trans dip stick area, throttle body, start feeling for the connector, you won't be able to put 2 hands in there. So, you will have to be very patient and take your time. While putting back the screw, be careful not to drop the screw :-)
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2007 C230SS; 2014 ML350 BT
PS: Still have no plans of abandoning it anytime soon, I am still happy with it considering all that has happened lately.
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Yes, it is frustrating, especially since my Jeep is dead too. I don't like having any of my vehicles non-functional, and I have 2 of the 3 down now, and my wife is without a running vehicle. Plus, the Mercedes is scheduled for the body shop Monday morning. Since I just changed jobs, I can't take a day off to take care of it. It is equally frustrating, as the Mercedes shouldn't be this damn unreliable. Oh well, hopefully I'll get them both sorted out this weekend.
PS: Still have no plans of abandoning it anytime soon, I am still happy with it considering all that has happened lately.
PS: Still have no plans of abandoning it anytime soon, I am still happy with it considering all that has happened lately.
To be honest, my car is running quite *****ty lately, too. I'm getting a ton of things done today (is in the shop now) and hopefully it will be sorted.
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From: Camas, WA
2007 C230SS; 2014 ML350 BT
John, I have replaced the CPS on my '07 C280. I removed the air filter assembly, then MAF, then the plastic elbow that comments MAF to throttle body. Once those parts were removed, I could see the CPS connector while standing next to the battery and looking towards the CPS area. Standing near the battery and putting the left hand from the trans dip stick area, throttle body, start feeling for the connector, you won't be able to put 2 hands in there. So, you will have to be very patient and take your time. While putting back the screw, be careful not to drop the screw :-)
Didn't consider trying from the passenger side, since the CPS is on the driver's side. But, I did notice there is much more room on the passenger side then the driver's side. The whole dropping the screw thing is what I am most worried about. When I replaced one of the camshaft magnets, I dropped one of the bolts, and it didn't drop out 
So, I had to get a replacement from the dealer. A couple of weeks later my wife found the bolt in the driveway 
Trying to source a magnet insert or magnetic E8 Torx socket.Since I wanted to pull the MAF to clean it anyway, I will try your method.
