Question about 2001 Mercedes-Benz C-Class

1 Answer

L have a 2001 C240 Merc and after starting (and warming up )moisture comes out of exhaust pipe( approx a couple of teaspoons). The other day after driving for some time, when stopping at the lights it began to idle rough,so l gave it some gas and it stopped. Normally car runs well. Is this bad?

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 4,793 Answers

One gallon of gas produces about 1 gallon of water vapor,its gotta go somewhere......thats why its best to run a car hot.have you seen a cars exhaust in winter,its steaming.......and the exhaust pipe is made of steel.....its cold..therefore CONDENSATION.

Posted on Nov 10, 2010


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

2001 blazer overheated now knocks and runs bad

Hi Wendy, hope I am wrong but it sounds like a cracked head or blown head gasket.
If the engine hasn't been started in a couple hours pull the engine oil dipstick and look at the oil level. If the oil level is over the full mark you likely have water in the bottom of the oil pan. Milky/semi-white oil on the dipstick would indicate the same. If the oil looks good and at or below the full level look in the water overflow for the radiator. Any sign of oil or milky looking foam is an indication of oil in the water from cracked head/block or blown head gasket. If both the water and oil look good start the engine, let it warm up and look to see if you have water coming out of the exhaust pipe. It is normal to see some water come out of the exhaust after starting a cold engine due to condensation in the muffler and catalytic converter but a healthy engine should have only a slight amount of water vapor coming out of the exhaust. Anything more would indicate a cracked head/block or blown head gasket.

Apr 03, 2014 | 2001 Chevrolet Blazer

1 Answer

I replaced the heater hoses and now there is water coming out of the exhaust pipe

A minor amount of moisture collects in exhaust pipe on a normal basis. Larger amounts indicate a possible blown head gasket. Check oil dipstick for possible water/antifreeze in oil. Had vehicle overheated or hose blown to require replacement? [excessive temperature might lead to head gasket's demise.]

Oct 09, 2013 | 2001 Ford Taurus

1 Answer

My 1996 I recently bought ran hot and by the time I parked it I turned it off and the holes busted and we replaced the holes and noticed smoke out the pipe but once it warm up got goes away.. but the oil...

is the coolant level staying full or do you have to add ? the moisture in oil cap is normal for an engine that sets, condensation forms as the engine cools down.the smoke you noticed may have been moisture burning off the exhaust as the engine warms to normal operating temp. you need to drive the truck to see if it starts to overheat or run poorly. letting it set or just starting it up for a while will most likely not help find a problem.

May 28, 2012 | 1996 Chevrolet C/K 2500

3 Answers

My pt cruiser after warming up throws white smoke from tail pipe . no loss of power or oil or antifrizee.

You are loosing coolant. White smoke only comes from water. Gray or blue from oil

No secret here, intake manifold or head gasket.

May 26, 2010 | 2002 Chrysler PT Cruiser

1 Answer

I have a 2001 Mitsubishi Montero Sport that has condensation and light white smoke coming out the back exhaust-what would cause this and how do I fix it?

If this goes away after warming up and driving for a while, dont worry about it .Its moisture that seeps in as exhaust system cools down, then when you start up water trapped in muffler boils off.

Mar 18, 2010 | 2001 Mitsubishi Montero Sport 4WD

1 Answer

2001 Mitsubishi Montero Sport has smoke and condensation coming out of the back pipe-what would cause this?

It's trapped moisture in exhaust pipes, dont worry about it, unless car ovrheats and you have unexplained coolant loss and novissible leaks. this would be blown head gasket. Did you post this same inquiry more than once?

Mar 18, 2010 | 2001 Mitsubishi Montero Sport 4WD

1 Answer

I havent run my car in awhile and I noticed that when I start the car and after its starts warming up it has a ticking noise when it is idoling. I figured its the lifters cause it hasnt been started all...

If the ticking is a constant ticking, it is most likely the lifters. The lifters in these engines are hydraulic and and must pump up with the oil pressure. Once the oil warms up and become thinner, the ticking will become constant due to the lower hydraulic pressure of the thinned out oil. As far as the moisture from the exhaust, this is also normal of a vehicle that has not been started in a long time as the condensation that builds up in the exhaust system must heat up to a point where all of the moisture burns off. The longer it sits, the more moisture will build up in the system requiring longer times to burn off. If after a few days of running the moisture does not burn off then I would get it checked out by a certified mechanic.

Jan 02, 2010 | 2004 Chrysler Sebring

1 Answer

When I attempt to start my 2001 Merc. Marquis 5L V8, sometimes the starter solenoid makes a clicking sound and the door locks go up and down. After a few tries it will start. When it warms up it will start...

next time you get it started go to an auto parts store and have them test the battery, charging system and the starter, This will only thake them a couple minutes, If they find nothing wrong most likely you have a bad starter and 1 day it will not crank anymore.
But first confirm that the battery terminals are clean by removing the terminals and cleaning them.

Jan 02, 2010 | Mercury Marquis Cars & Trucks

1 Answer

Also, does anyone know how I can increase the horsepower in my 2001 mercedes-benz c240 without spending too much money...any good websites out there? Thanks

1. You can improve the cold air flow to your engine's air inlet system with after market modifications.

2. You can fit a larger and more efficient free flow exhaust system from the base of the engine header pipes to the end of the system.

Mercedes are complex vehicles with complex electronics which will be affected if you undertake modifications. You will need to find a reputable mercedes specialist which undertakes power modifications and understands what adjustments need to be made to the electronics, such as the sensors and engine management, when modifications are made to the vehicle. Also you will need to fit parts that are designed for/suitable for that particular vehicle. The C240 is not a model that is typically selected for after market power mods.

Frankly, if it was my 2001 merc I would not fiddle with it. These cars are unreliable enough once they get a few miles (and age) up and you are potentially inviting problems with some after market modifications.

If you want more power I would suggest you are much better off getting an alternative vehicle that offers the performance you require. This will prove much cheaper in the long run and there are many reasonably priced attractive vehicles available that offer much more power (and power to weight ratio) than the approx 168 BHP of the MB C240 .
Furthermore, if you undertake modifications on this car it will be more difficult to sell and you will also very likely detrimentally affect the resale value. Many MB buyers typically don't like to buy cars that have been tinkered with and altered from the factory spec.

Dec 05, 2009 | 2001 Mercedes-Benz C-Class

Not finding what you are looking for?
2001 Mercedes-Benz C-Class Logo

187 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercedes-Benz Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers


Level 3 Expert

78919 Answers

Joseph Prosser

Level 3 Expert

772 Answers

Are you a Mercedes-Benz Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides