Poor Acceleration E240 - Benzworld.org

mercfansydney · 09-12-2005, 01:43 AM

Hi I've recently been testing my 1999 E240 and discovered that the acceleration and top speed was much poorer than I expected.

The top speed I reached while on a long straight for about 2 minutes was 140km/h. When I used the kickdown switch the speed fell and while the revs hit 6000-7000, I kept slowing down. Is this normal? Should the top speed be higher? Even when not using the kickdown switch?

The car was able to reach 170km/h down hill.

Thanks!

WicklowMan · 09-20-2005, 06:09 PM

Hi,

Firstly, it is rare to find another E240 owner on this site as they are all Americans and I do not think the E240 was sold there ( engine too small!) I have a 2000 E240 and your speeds seem very low. I have not been above 110mph but the car had plenty of life in her at that speed. I see your post is quite old, did you get the problem solved?

Kind regards,

BOB

Storm. · 09-21-2005, 04:21 AM

I think his problem was fixed by adding a little oil in the engine.

(NB:- the 1998+ 240, 280 & 320 are all M112 engines)

mercfansydney · 10-05-2005, 06:40 PM

Hey, thanks for replying. You're right, there aren't many E240 owners here, good to hear from you.

Unfortunately I still haven't solved the problem.

With regards to adding oil, that fixed another problem I had. The car wouldn't leave 1st gear, it was stuck in "limp home mode". I discovered the car had very little oil. It was fixed by adding oil.

I've now over filled the oil, and haven't got around to draining it. I tried to get up to max speed when the oil was over filled. Perhaps when I drain the oil it may reach higher than 140km/h.

Also with regards to the kick down switch, why doesn't the car respond in increasing speed, but the revs hit 6000?

Regards
mercfansydney

Storm. · 10-07-2005, 01:38 AM

too much oil can be just as bad as too little,.. get it out ASAP before you cause irreperable damage.

doggydingo · 10-11-2005, 06:00 AM

try a air flow sensor and take it to a benz shop and get the boot strapping (ecu) reset

krusty · 10-14-2005, 07:43 AM

Has your fuel mileage dropped with the onset of your acceleration problem? If so, I bet your catalyst is plugging up.

mbenzoi · 10-14-2005, 08:06 AM

if a car has a poor output it could be mixture formation, O2 sensors before TWC, MAF, coolant temperature sensor, exhaust back pressure too high.

mercfansydney · 05-19-2006, 06:58 PM

It turned out to be oxygen sensor. Replaced and everything is fine.