Hesitation from take offs. c240

255

Asked by Apr 18, 2013 at 10:04 AM about the 2004 Mercedes-Benz C-Class C 240 4MATIC AWD Sedan

Question type: Maintenance & Repair

At every stop, my MB c240 takes a little bit to get the RPMs back to normal and take off is very slow. I was told it is a sensor, but can't recall what or which one. It deals with the RPMs. Thanks to everyone for your' advice.
I ask this question a few months ago, I noticed some have looked at it but still no answers. Has anyone ever had this problem? Or am I asking it in the wrong way? Thanks again. Happy Trails.

14 Answers

270,425

The reasons for no answers is that it can be any number of issues. Do you have a service or check engine light on so we can pinpoint the issue?

8 of 8 people found this helpful.
270,425

One issue it could be the pedal value sensor losing it's signal to the ME control unit. It's located on the accelerator pedal. Did you take your car to the Mercedes mechanic to have it diagnosed and they couldn't fix the issue? If you want to find a solution, I suggest you frequent a Mercedes Benz forum and research threads with similar issues and ask questions.

5 of 5 people found this helpful.
Best Answer Mark helpful
255

Hi Tom, no, there isn't any check eng. lights on or have been on. This started when we were in MD. I thought it was bad gas. I only use premium. Lately, the car every now and again almost dies at red lights/stop signs. Luckily, it hasn't killed over yet, ha. One person at the MB dealership said it is a sensor that causes three or four plugs to foul out, that's why it is acting like it does. but, I forgot what he called the sensor, electric component. Do you know of any sensors that can cause this problem? Oh, sry, thanks for answering my question(s) too. And no, I haven't taken it to the dealership because of cost. 'I'm a 100% service connected disabled vet 1972.' Not a bunch of bucks to live on, ha. I do the repairs mostly myself. Like the water pump I replaced and saved over $600.00. A while back I was checking the web to find an answer and a lot of folks had this problem. But, I had to reformat this pc and lost the short-cut. It seems like they all leaned towards the sensor(s). The pedal Value sensor sounds like a good start, I will try to check it out. Is there anyway I can use a volt meter on it? Are they very costly and can I get one at a parts store? Or is it a Dealership part? (I really don't need another car for what MB charges) lmao. Thanks again Tom for the info, I appreciate that very much. Have a good one. Happy trails partner.

1 of 1 people found this helpful.
270,425

OK, so you want to look at the basics then. Change plugs, wires, replace air and fuel filter, clean throttle body and MAF. Look for vacuum leaks too, and make sure the air breather is intact.

3 of 3 people found this helpful.
1,625

There are two possible solutions. The cheapest (and most common) is the crankshaft position sensor. Located on the left side of the engine at the bell housing. It not too difficult to remove, you'll need a long 1/4" extension and a T8 socket. When it fails the engine cranks but fails to start (intermittently), or the engine will almost stall at stops, not sure about the lack of power you mention or slow to gain rpm's. It can be tested by measuring the resistance across its two terminals. Any reading over 900 ohms, I would replace it. It won't set a fault code in the engine control unit. The other solution is the Mass Air Flow MAF sensor, may or may not set a fault code, definitely causes lack of power and slow to gain rpm's. Cleaning it won't help. Rather expensive from MB dealer, try aftermarket or VW dealers.

1 of 1 people found this helpful.
150

I think the catalayal converters are plug up.

10

2005 c240 Mercedes cranks won't start intermittent when it does start lots of white smoke very strong gas smell no codes dealer said replace cps did that still same problem replaced mass air flow fuel filter injectors did Cylinder leake test all good any help?

1 of 1 people found this helpful.
20

My C240 too, at every stop,takes a little bit to get the RPMs back to normal and take off is very slow.the first time it was due to spark plugs coils and the second time was due to clogged air filters along with out of order "air mass flow sensor"

2 of 2 people found this helpful.
90

My car only hesates at take offs it feels like the e brake is stuck what could it be

8 of 8 people found this helpful.
70

My 2006 240, just recently (2 weeks ago) started giving my problems. It hesitates at take off, when the engine is cold, only. After the engine warms up, thee issue goes away. Just today the check engine light came on. Any clues? I was thinking maybe fuel or air filter...

7 of 7 people found this helpful.

2004 e 500 mercedes I changed gas pedal sensor fixed my problem with me I would give it the gas and had no response sometimes just takes off slow I bought mine on ebay

Mercedec is a shit, rubbish. it is not rare case, many Mercedes I saw have the same issue, it wont take off faster, I got screwed many times in busy round abouts waiting for fast entry. especially models below 2006. japanses cars perform well, but benz is like sick and nobody has answer for it, everyone tells, this sensor that sensor, nothing works. now people are telling Mercedes is like that. better to avoid the unnecessary expensive rubbish, just packed with options and leather.

20

This could be an issue with double footing. i.e accidentally pressing gas and brake at the same time when you stop. This is solved by resetting the sensor. Turn the car off. Turn the key two times(to position just before starting) and press the accelerator pedal for at least 10 seconds. Turn key back to off position and release accelerator pedal. Leave key in for 10 seconds and then remove key. The car should work fine after this

2 of 2 people found this helpful.

Mercedes factory rep says to turn off the green eco button after EVERY time you start the car to keep the hesitation off the line (from the start) from happening.

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