slow acceleration help - BMW Forum - BimmerWerkz.com
3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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#1 (permalink) Old 05-14-2004, 07:51 PM
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hi everyone. i have a 1987 325is bmw. ive had it for like a year now. its been running good up till like this past winter and up to now. it starts up fine but its got like no acceleration at all so i did this to it. i changed the cap, rotor, mass airflow meter. timing belt, fuel filter, plugs, wires, coil, and thats about it. at it still runs terrible. now im looking to change the main computer but i dont know bc its alot of money. can someone plz tell me what else it might be.
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#2 (permalink) Old 05-14-2004, 08:23 PM
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I'm assuming you have replaced the air filter. If you havent, GO BUY ONE! you also might want to dump some fuel injector cleaner and other stuff through your engine. The computer shouldnt have much to do with your acceleration. If you put anything aftermarket on it (specifically the ignition wires/coils) you may want to switch back to OEM.

More specific information would be helpful, What RPM's / gear does it slow in, you could need a new clutch if its a manual, or possibly some transmission components.

Replace the air filter...if you havent, PRONTO. That'll suck your horsepower dry.

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#3 (permalink) Old 05-14-2004, 09:31 PM
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Make sure you check the intake bellows, those can crack pretty easily. My was bad and when the engine was running i would pry mine aaprt and the car would die. When you accelerate the engine shifts around so it could be pullin the intake bellows apart. Just my .02 cents

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#4 (permalink) Old 05-15-2004, 12:42 PM
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well i have ran alot of cleaners into my car like the injectors and corbon cleaner. the air filter is brand new. i just have one clue what it is. like the car had terrible acceleration all the time in every gear. and even if not in gear the rpms go up very slow. help plz
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#5 (permalink) Old 05-15-2004, 05:54 PM
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Your Catalytic Converter could be bad. I hope it isnt that becasue it will cost u some $$$$$$$ to replace

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#6 (permalink) Old 05-15-2004, 05:55 PM
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can i be the o2 senser. but im not sure if it is bc i took it out and ran my car and it still ran lke shit. or would it work if i was to buy a new one. and do they like reset the computer if you do
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#7 (permalink) Old 05-15-2004, 06:04 PM
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Yea if u took out the oxygen sensor and it ran like crap it should have. All the Oxygen sensor does is reads teh amount of oxygen in the system and it adjusts the fuel ratios accordingly. You can try buying a new Oxygen sensor, it might help, I just got one and it helped the car idle better. I think they are like 70 dollars. Did Check the Intake bellows yet?

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#8 (permalink) Old 05-15-2004, 06:08 PM
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No it doesn't reset the computer

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#9 (permalink) Old 05-16-2004, 01:05 AM
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ok thanx but i know its not that cat bc i took it off and drove and there was no differance in power at all. it seems like the in proper fuel air ratio is going on but im not sure
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#10 (permalink) Old 05-16-2004, 08:51 AM
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how loud was that?

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#11 (permalink) Old 05-16-2004, 10:17 AM
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Not as loud as my 635 withOUT an exhaust.


It just sorta dropped off, rusted mount.

Took it down to teh shop and had it rewelded/replaced.

LOUD AS HELL.

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#12 (permalink) Old 05-16-2004, 07:16 PM
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so does anyone know what else it might be thats wrong with my car plz
i need help big time im stuck on it and dont know what else to try
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#13 (permalink) Old 05-16-2004, 08:46 PM
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jaykool, what have you tried and what were the results?

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#14 (permalink) Old 05-17-2004, 02:59 PM
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changed the cap, rotor,spark plugs, wires, mass airflow meter, timing belt, fuel filter, plugs, wires, coil,some sencer that cheaks the teath on the fly wheel, cheaked the valves to see if they got lose, and thats all that i can think off. plz help
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#15 (permalink) Old 05-17-2004, 09:58 PM
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Replace the air filter and your o2 sensor.

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