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1990 Mercedes-Benz 300E 4MATIC Problems

 

Engine Oil and Coolant Leaks Resulting in Fulid Intermix

Verified for the Mercedes-Benz 300E 4MATIC

Internal and External engine oil & coolant leaks can develop from the head gasket and/or timing cover gasket; these leaks should be repaired before the engine oil and coolant intermix which can result in severe engine damage.

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Rough Running Engine Due to Misfire

Verified for the Mercedes-Benz 300E 4MATIC

A rough running motor or lack of power can be caused by a failed distributor cap or rotor, ignition wires (or their resistors), or valve cover gasket leaks. If the valve cover gasket leaks, oil can pool where the ignition wire resistor connects to the spark plug. The resistor can fail and the spark plug may not fire because of a short circuit through the oil.

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Shifter Lever Bushings May Break Causing Loose Feel/Noise

Verified for the Mercedes-Benz 300E 4MATIC

The bushings for the shifter lever wear out to the point where they break and fall out. This causes excessive movement (loose feel) in the shifter lever and a clanging-type noise when changing gears.

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Throttle Valves May Experience Electrical Failure

Verified for the Mercedes-Benz 300E 4MATIC

The electronic throttle assembly may suffer an electrical failure. It is often cheaper to send the valve to a service center for repair that to purchase a new part.

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Buttons on temperature control assemblies work erratically due to wear of parts in control head

Verified for the Mercedes-Benz 300E 4MATIC
Due to wear of mechanical parts in the control head, the buttons on temperature control assemblies work erratically or not at all. These control heads need to be replaced for this concern or when the display screen starts to fade out.
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Excess Free Play in Steering and/or Alignment Issue

Verified for the Mercedes-Benz 300E 4MATIC

One or more of the following steering linkage components may wear prematurely;  tie rod ends, drag link, or idler arm. Our technicians remind us the wheel alignment should be checked and adjusted if any of these items are replaced.

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Part that attaches distributor rotor to camshaft may break

Verified for the Mercedes-Benz 300E 4MATIC
The part that attaches the distributor rotor to the camshaft can break; the starter will still crank, but the engine will not start.
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ABS Modulator Failure Due to Dirty Brake Fluid

Verified for the Mercedes-Benz 300E 4MATIC

It is not uncommon to encounter premature failure of the anti-lock brake system (ABS) modulator assembly due to dirty brake fluid. Our technicians recommend flushing the brake fluid every two years in order to help prevent this problem.

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Coolant Hoses May Fail Unexpectedly

Verified for the Mercedes-Benz 300E 4MATIC

The cooling system hoses may fail unexpectedly. The hoses can look good on the outside, but the rubber can degrade and erode on the inside. If not carefully checked, the hoses can burst at any time.

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Worn seat springs/padding may cause lean or sag

Verified for the Mercedes-Benz 300E 4MATIC
The seat springs and padding break down over time, causing a lean, tilt, or sag.
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Cracked Driveshaft Flex Discs May Cause Driveshaft Movement/Vibration

Verified for the Mercedes-Benz 300E 4MATIC

A vibration felt through the center floor of the vehicle can be caused by driveshaft flex discs, which crack and shred, causing excessive driveshaft movement. Not repairing these can cause damage to the driveshaft center support bearing, or, in the worst case scenario, damage to the transmission or differential.

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The Differential May Develop Leaks From the Seals or Cover

Verified for the Mercedes-Benz 300E 4MATIC

High mileage or older vehicles commonly develop leaks from the differential seals and/or cover. Our technicians recommend a complete reseal of the differential unit whenever these leaks are repaired.

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The Speedometer May Fail Due to Internal Drive Gear Wear

Verified for the Mercedes-Benz 300E 4MATIC

Due to wear of the internal drive gear, the speedometer can stop working.

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Improper Temperature Output From HVAC

Verified for the Mercedes-Benz 300E 4MATIC

One or more blend door vacuum actuators may fail resulting in the incorrect output temperature from the HVAC system. Failed actuators will require replacement to restore proper HVAC operation.

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Head Light Lenses Become Cloudy/Opaque

Verified for the Mercedes-Benz 300E 4MATIC

Due to exposure to the sun, lenses for head lights may become opaque (cloudy or hazy). This reduces the effectiveness of the lights. Our technicians tell us plastic polishes can improve the clarity of the lenses, but replacement of the lamp housings is the only way to regain the full intensity of the lights.

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