Skip the auto shop - Our mechanics make house calls

Q: My old Mercedes is shaking back and forth at 80kmh and then stalling

asked by on

Its a 1984 Mercedes Benz 200 which idles perfectly but when u get up to about 80kmh it starts to yank back and forth really hard almost like something is tugging it forward and the back, it does that and then stalls after 10 sec no mater what u do ... Ifyou then turn the key it starts up just fine and runs normally until u get back up to 80 then it does it again ... it has been driven gently al its life and have been really taken care of .

My car has 260000 miles.
My car has a manual transmission.

A: What you have described, back in the old da...

What you have described, back in the old days, are classic symptoms of a fuel pump failing or a clogged fuel filter. The pump can move enough fuel to keep the car going at slow speeds, but the engine starts to starve when you really put a demand on it. But the fuel pump may not be the only issue. The old Mercedes had a fuel tank screen that could become plugged with rust, not allowing the fuel pump to draw enough fuel to keep the engine happy. The screen is accessible through a plug in the bottom of the tank. Cleaning it is a miserable job, though, because you have to deal with all of that gas pouring out of the bottom when you take out the plug. If you decide you don’t want to take the job on, have a technician inspect your car’s acceleration problem and check the fuel pump for you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: turned it off was running hot went to start turns over but wont start

Without knowing the exact model and engine you have, it's hard to give any guidance on a diagnosis. However it does sound like you may have overheated the engine to the point you warped the cylinder heads or blew the...

Q: oil is leaking onto the MAP sensor...and is intermittently stalling

If you were told that the upper intake needs to be replaced then this may cause problems with the MAP sensor and the way the engine runs. A MAP sensor is very important to controlling the fuel strategy to the...

Q: Car shakes and jerks

Hi there, when you say jerking do you mean a vibration or changing in speed? If the car changes in speed, then you should make sure your fuel pressure is okay. Other Impala owners have reported a shaking at startup...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...