seriously i need help for accelration - Mercedes-Benz Forum
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post #1 of 13 (permalink) Old 05-05-2016, 02:15 AM Thread Starter
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Thumbs down seriously i need help for accelration

i have 230E 1988 auto 4 speed m102 i have a problem with acceleration my problem is very high rpm high fuel companion rough shifting i want to change the differential i have 2.27 is it suitable?? with tires R15/55/205 ?
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post #2 of 13 (permalink) Old 05-05-2016, 02:19 AM Thread Starter
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some people say the catlytic converter is making this problem is it true ???
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post #3 of 13 (permalink) Old 05-05-2016, 04:51 AM
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Hassan

You state that you need acceleration help, but you're not clear if the car isn't running correctly or you just want a faster car.
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post #4 of 13 (permalink) Old 05-05-2016, 05:49 AM
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^Exactly. The W124 is already a relatively heavy car, and not quick on its feet even with its 6 cylinder brother the M103. Yours is saddled with a small 4 cylinder that is taxed even further with a automatic transmission.

The 4 and 6 cylinder engines turn higher rpms to keep the engine in the power band. That is just the way they are designed. Putting in a differential with a lower ratio will only make acceleration worse.

Not quite sure what a fuel companion is, though.

If you want better acceleration then you should find a later W124 with a twin cam M104 6 cylinder or go the V8 route.
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post #5 of 13 (permalink) Old 05-05-2016, 07:05 AM
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Originally Posted by Hassan Koura View Post
some people say the catlytic converter is making this problem is it true ???
It's entirely possible, though I would check myriad other things before suspecting the catalytic converter is bad. Make sure all maintenance is up to snuff first, catalyst replacement is not inexpensive.
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post #6 of 13 (permalink) Old 05-05-2016, 07:09 AM
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The vast majority of 230E cars did not have any catalyst equipment, so it is unlikely that is the issue.

If the dash has a Check Engine light indicating the presence of a oxygen sensor, then it is equipped with a catalyst.
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post #7 of 13 (permalink) Old 05-05-2016, 07:18 AM
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Sounds like your engine might be getting to much fuel. Check fuel mix and oxygen sensor.If you still suspect exhaust being restricted put a vacuum gauge on engine if you have less that 15 inches of vac after engine runs for five minutes then it may be possible. Cats dont go bad by them self it takes to much fuel or to much oil to kill them. I have a 300e with over 380000 miles on it and still has the original cat. It still passes california smog without any trouble


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post #8 of 13 (permalink) Old 05-06-2016, 12:53 PM Thread Starter
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the problem

the car get from 0 to 100 km/h in 35 sec and rough shifting and high rpm at ex at 100km/h the rpm 4
sure it`s not normal
i changed the short block and the gear box
but not anything changed
i need help some people say that`s vacuum leak other say it`s catalytic converter some say it`s the differential some say it`s o2 sensor and i check the presence of it not found it and mechanical shop say it`s not found in this car :/ if any one sure where the problem exactly please tell me
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post #9 of 13 (permalink) Old 05-06-2016, 12:57 PM
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Are you sure it is not just a simple case of one of the car's 3 fuel filters and/or the air filter being clogged???

4K rpm @100 km/h in a 4 cylinder W124 with automatic sounds about right, and perfectly normal. Remember, it is only a 4 speed gearbox.

If you accelerate with your foot fully depressed and without letting go, does it start in 1st gear and shift at or close to redline until it is in 4th gear???

Last edited by sbaert; 05-06-2016 at 01:09 PM.
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post #10 of 13 (permalink) Old 05-09-2016, 01:22 AM
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Unlikely that you have a 2.27 diff in a four cylinder car unless that was changed. But that could explain glacial acceleration.

'O=00=O' BMW 2002. long live the legend.


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