Question about 1989 Mercedes-Benz 300-Class

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Engine Mechanical problem 1990 Mercedes Benz 300e 6 cyl Two Wheel Drive Automatic 190,00 miles When car is just started it runs great. As soon as it gets to running temperature it runs terrible. It appears to be fuel related because when you step on the gas it does very little unless you nail it. Then it takes off. Its not like you can feather the gas, it is all or nothing. Sometimes it makes a popping sound. No power unless you put petal to the floor. Replaced gas tank, fuel pump, fuel filter, fuel injectors, cap, rotor, plugs and wires. Can't figure it out.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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ginko
  • 19396 Answers

SOURCE: 1993 Mercedes Benz 300E, right rear squeak

Common causes for High-pitched noise from rear wheels are:

The wheel bearing: this is not usually dangerous in the short term, but I recommend contacting a mechanic and having it fixed. To test the wheel bearing, you lock front wheels, and jack up the car rear and spin the wheel (handbrake unlocked). If bearing is worn you hear a drone. When is the bearing, often car starts vibration above 40 mph.
Noise from bearing can be continuous, intermittent, only when steering, only when hot.

The brake pads: when brake pads are worn out they start making a squealing noise, in this case the noise is only when you brake or continuous. When you jack up the car the wheel may be a little stiff, but not necessarily.When brake pads are completely gone you also hear a scratching noise when braking. Inspect your brakes immediately.

Other suspension problems: Jack up the car as suggested above, check if the wheel has a slight play on the sides. Check all of the suspension components, suspension mounting points, and steering linkage for damage. Also, check the frame rail for wrinkles. It is very important that these components be in good condition, if you notice any problem here, go immediately to a mechanic.

Try doing the simple test above, reinstalling the wheel and working the tire back and forth. This is a common test for bad ball joints and wheel bearings.

Posted on Jul 17, 2008

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SOURCE: how do you disable the alarm on a mercedes benz 300E 1987

Use your door key and unlock your drivers door ... that is what disables the alarm system. Make sure that the battery is rehooked... because i'm sure you took the battery loose when you couldn't get the alarm to turn off.

Posted on Nov 17, 2008

tepfy
  • 319 Answers

SOURCE: engine rough in low idle

I would start by replacing your automatic air intake and throtle body sensor. Check these 2 things out and let me know.

tepfy

Posted on Feb 27, 2009

jasperoni
  • 203 Answers

SOURCE: My 1995 S500 Mercedes Benz is idling very rough.

before you spend any more money on your vehicle run a cylinder compression test. I know it seems unlikley with less than 100,000 miles but 119 engines do like to burn valves. the LH fuel injection system was only used from 93-95. LH is a germen abreviation for hot wire mass airflow. The later systems use a hot film. Your vehicle has electronic fuel injection so why did you have the fuel injecters pressure cleaned. unless you have the cis system which means your car is not a 95. Motor mounts are also a very common failure on that vehicle. In any event rule out the worst case and perform a compression test because it really sucks to spend alot on an engine and find out it needs a valve job. I'm assuming that the check engine light is not on. although wireharness issues are another common issue. these early C.A.N. cars are very difficult to troubleshoot electronically and the information provided by the factory is difficult to follow.

Posted on May 17, 2009

taran_2005
  • 10515 Answers

SOURCE: need to locate fuel filter on 1989 mercedes benz

Hi,

The fuel filter is located on the right rear underside of the car, just ahead of the rear axel area. You need to remove the cover to find it. It is the large canister next to the electric fuel pump.

Thanks.

Posted on Jun 18, 2009

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I would start by replacing your automatic air intake and throtle body sensor. Check these 2 things out and let me know.

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1 Answer

1993 Mercedes Benz 300E, right rear squeak


Common causes for High-pitched noise from rear wheels are:

The wheel bearing: this is not usually dangerous in the short term, but I recommend contacting a mechanic and having it fixed. To test the wheel bearing, you lock front wheels, and jack up the car rear and spin the wheel (handbrake unlocked). If bearing is worn you hear a drone. When is the bearing, often car starts vibration above 40 mph.
Noise from bearing can be continuous, intermittent, only when steering, only when hot.

The brake pads: when brake pads are worn out they start making a squealing noise, in this case the noise is only when you brake or continuous. When you jack up the car the wheel may be a little stiff, but not necessarily.When brake pads are completely gone you also hear a scratching noise when braking. Inspect your brakes immediately.

Other suspension problems: Jack up the car as suggested above, check if the wheel has a slight play on the sides. Check all of the suspension components, suspension mounting points, and steering linkage for damage. Also, check the frame rail for wrinkles. It is very important that these components be in good condition, if you notice any problem here, go immediately to a mechanic.

Try doing the simple test above, reinstalling the wheel and working the tire back and forth. This is a common test for bad ball joints and wheel bearings.

Jul 17, 2008 | 1993 Mercedes-Benz Mercedes Benz 300 Class

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