Question about 2001 BMW 5 Series

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My car is not accelerating when I depress the gas pedal

If I slow down then press the gas hard to accelerate , it seems like the the gas is choking the engine. The car idles but studders when I attempt to accelerate. If I turn the ignition off then on, it fixes itself but not all the time. Is this a sensor or is the fuel octane level of 89 too low for this engine?

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  • Anonymous May 16, 2009

    1990 Honda Accord EX slows down when pressing on accelator? Do I need to buy a fuel pump?

  • JOHN LUGO May 11, 2010

    is the check engine light on ? try reving the engine when is in neutral does it rev ?

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Scott Perry
Owner /Operator
Storm Motor Company Ltd

Its not entirely possible that a low octane level is causing your problem. But highly unlikely. More likely a problem with the fuel delivery sytem of some kind. Possibly a sensor, fuel pump/pressure or a leak (vac/fuel/air) if your getting a engine management light get someone to throw a scanner on it and see if you have any codes that may tell you the problem or give you some clues from the data. Most independants have scanners of some kind now so you dont have to go to bmw. Cost usualy £30 to £70. Have a look round under the bonnet check your vac hosses intake pipes for air leaks or cracks that could be letting in air and giving false readings to maf/map etc. Check plugs to sensors, never rule out the simple stuff. : )

Posted on Nov 23, 2008

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I would change the fuel filter

Posted on Nov 23, 2008

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1 Answer

Engine revs but no acceleration


Clutch plate and pressure plate seem to be too weak to pull the car. Or one of the CV joints is detached from the gear box. To test the clutch plate, park the car on flat surface. Pull the hand brake up, start the car, depress the foot brake pedal, depress the clutch pedal, put the car in 1st gear, press the gas pedal and leave the clutch pedal at once, while keeping the brake pedal depressed.
Follow one of the two following statements:
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Car will not accelerate when gas pushed


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2005 Mazda 6 4cyl AT Idles high after driving a while.


I would check the pedal position sensor. Do it when it's hot.
Mazda Car 2005-06
  • Accelerator Pedal Position Sensor

    Description & Operation

    A power supply is applied on the Accelerator Pedal Position (APP) Sensor (main) power terminal from the PCM. The ground terminal is grounded with PCM. When the accelerator pedal is moved from the idle position to the fully opened position, the resistance between the accelerator pedal position sensor (main) output terminal and ground terminal will increase according to the depression.
    A power supply is applied on the Accelerator Pedal Position (APP) Sensor (main) power terminal from the PCM. The ground terminal is grounded with PCM. When the accelerator pedal is moved from the idle position to the fully opened position, the resistance between the accelerator pedal position sensor (main) output terminal and ground terminal will increase according to the depression.

Testing

  1. Connect a suitable scan tool to the diagnostic connector. Select APP1 or APP2 percentage.
  2. Turn the ignition switch to the ON position.
  3. Measure the voltage at the PCM terminal and ground with connectors connected:

    APP1-8% load or 0.4 volts with the accelerator pedal releasedAPP1-60% load or 3.0 volts with the accelerator pedal depressedAPP2 -8% load or 0.4 volts with the accelerator pedal releasedAPP2 -60% load or 3.0 volts with the accelerator pedal depressed
  4. If any check above does not meet the specifications, check connectors and wiring between the sensor and PCM. If ok, replace PCM.
  5. If the measured values are outside the standard value range, or if the load % and/or voltage does not change smoothly, replace the sensor.
  1. Connect a suitable scan tool to the diagnostic connector. Select APP1 or APP2 percentage.
  2. Turn the ignition switch to the ON position.
  3. Measure the voltage at the PCM terminal and ground with connectors connected:

    APP1 %-31.0-32.4% with the accelerator pedal releasedAPP1 %-69.8-81.8% with the accelerator pedal depressedAPP2 %-20.2-21.4% with the accelerator pedal releasedAPP2 %-58.8-70.8% with the accelerator pedal depressed
  4. If any check above does not meet the specifications, check connectors and wiring between the sensor and PCM. If ok, replace PCM.
  5. If the measured values are outside the standard value range, or if the load % does not change smoothly, replace the senso

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1 Answer

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For this types of problem,there are few help links.I suggest you to click the link below and go through the troubleshooting procedure :-----Car only starts when gas pedal is pressed? http://technoanswers.blogspot.com/2012/01/car-only-starts-when-gas-pedal-is.html-----------Car won't start without hitting the gas pedal? http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-without-hitting-gas.html
----------Complete loss of brake pedal then all gets normal? http://repairhelpcenter.blogspot.com/2012/01/complete-loss-of-brake-pedal-then-all.html
----------Car dies when gas pedal is pressed? http://schematicsdiagram.blogspot.com/2011/12/car-dies-when-gas-pedal-is-pressed.html
--------------Pushing on the gas pedal, but the car slows down? Gas pedal to the floor and the car slows down? http://technoanswers.blogspot.in/2012/02/pushing-on-gas-pedal-but-car-slows-down.html
-------------Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html----------This will help.Thanks.

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3 Answers

Accelerator catches/sticks when depressed. You must then press very hard to get it past that point.


go under the hood and manually move the accelerator to see what is binding it.

If you dont know how to do this then get an assistant to press on the accelerator (car does not have to be on) and whatch for the part that moves as he accelerates. Manually move this to find the binding. Please note that it is possible to have binding with in the cable assembly back to the foot pedal.

Good luck

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It sounds like a prob with the cable from the peddle to the intake. Also check the motor mounts! Frankster016

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Sounds like a fuel delivery problem! Try filter first (cheapest), then the pump
Hope this helps, Henry

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