Hello, I drive a 1989 MErceds 300 E. When it is completely cold (just started) it accelerates like there is no tomorrow, when it warms up however there is a range (50-70 degrees C) where no matter how hard I push, the car simply will not go any faster. The economy needle goes all the way red and the car has actually stopped on hills wit hthe accelerator on the floor. The only way to get past the problem is either to wai until it warms completely, or to just drive on flat ground until it warms to 80. Once the temp gauge hits that 80 C mark though, its like the car is waking up and there are no problems. Any help on this would be greatly appreciated.
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Re: Acceleration problem when temp at 50-70 deg. C
Jack the car up on the drivers side and block it for safety. Now look under the car at the transmission. If there is a block with an electric switch mounted to the trans(look right where the trans bolts to engine) then you have a shifter lock out that limits the rpm's until the catalytic converter warms up. Just disconnect it and you should be fine.
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any codes like air temp sensor, MAP or o2 sensors. A local auto parts place should be able to read the live data stream for you at no cost. Could just need an intake clean. I have seen a bad coil here and there(when wet). Great car.
full power is only achieved when the engine is fully warm(operating temp).so if you accelerate more than, say, a third of the gas pedal,the car will feel sluggish.
this is more apparent when first starting the car in the morning in winter.almost like the car is going to stall.
most wear in the engine is leaving it to idle when cold you should always drive the car straight away from cold.then when hot turn on the a/c if required....
It sounds like you may have a problem feeding the fuel to your engine, I had the same problem with my 89 RS. All the 1989 model's fuel systems were recalled. I think you may need a new fuel pump. The fuel pump is located inside the gas tank in the rear of the car right under the rear axle. The fuel pump itself isn't too expensive, but with other small parts such as the electrical harness upgrade and fuel filter and the labor you should be looking somewhere in the $500 range. I hope this helps.
take your car for a tune up if they are carburetor type motors you may need your carbie cleaned and a tune up if you clean it your self with carbie cleaner it may increase in idle speed this is nothing to worries about it is a simple adjustment with a carburetor type motor they tend to idle higher when their cold this is the automatic choke kicking in and normally it should happen till the car is a bit warmer and the accelerator has been depresses although a car should idle at 800 rpm my paddok car dose when it is cold it idles at 1200rpm i like it this way as the car warms up quicker as i will not drive a car while it is cold hope this helps ricko