What can cause slow acceleration?

Answer 1

I would check for a plugged fuel filter or plugged exhuast system. Also there can be a transmission related problem, a drag possibly coming from a wheel (such as e-brake on or stuck, calipers not releasing. Too much fuel or too little fuel getting to the combustion chambers which can be a mechanical kind of problem like a fuel leak. worn plugs or a engine management control problem like an oxygen sensor or a throttle position sensor. Check the accelerator cable to see if it is excessively stretched and not allowing the engine to achieve maximum acceleration.

Also could be a fuel pump which is beginning to go. Thus the fuel is not regulated properly and affecting the usual acceleration. Lack of maintenance such as spark plugs, plugged filters, carbon build up.

Answer 2

Car Slow To Accelerate

Answer 3

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What can cause slow acceleration?

Answer 4

Mostly you would need a scan tool to check for the following:
-Long term fuel trim at WOT (wide open throttle) should be close to 20% indicating the ECM is sending fuel to the engine. At idle both banks should ideally be -10 to +10%. the higher percentage indicates a lean mixture reading in the exhaust and vice versa for the lower percentage.
-Fuel pressure guage to check for fuel rail pressure, usually 50 to 60 psi at idle. Also Key on Eng off should be less the 5psi leak down, anything more could indicate fuel regulator or leaking line.
-Common poor acceleration is a clogged exhaust. Fastest way to check is a back pressure guage connected in front of the CATs in the o2 sensor ports. @ idle should be .5 psi or less and usually 5 psi or less at 2500rpms. Another way to check is with scan tool and observe your MAP sensor reading. Usually at ocean level the MAP would be at 45ish kPa @ idle. Increse to 2500 rpms and you will see the MAP increase close to 100kPa but level back off to close the idle reading. If it stays more than 25% higher than your idle reading or steadily increases back up to 100kPa this indicates a loss of vaccum caused by excess back pressure.
-I'll add some more checks real soon

Answer 5

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you already answered your own question right there the fuel pump is not supposed to make a noticeable noise all the time,i just got done replacing one that was doing that,when a dodge pump makes that kind of a noise its going out,and will cause low fuel pressure,you actually found the problem with it,change that and id say it will greatly improve ,good luck on it.

Answer 6

depends is it slow acceleration with slow engine RPM or slow to gain RPM as well if the engine is turning RPM and the car is not accelerating it could be the trans. if the engine is not gaining RPM then it could be timing or low compression from being worn out

Answer 7

in a car it could be a number of things mainly your transmission may be going out, our mabe a belt is about to break if your check engine light is on then go to Auto Zone and they will hook it up to a machine that will tell you what the problem is depending on your car and if it can read you make,model,and year ~~~~Good Luck

Answer 8

Slow acceleration is caused by the mass, friction and in turn the velocity with which the body is moving.

Answer 9

Are you losing power as well? Could be a clogged fuel filter.

Answer 10

bad transmittion, bad spark plugs lots of things. clogged fuel filter