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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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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Question to Toyota Ed: How would you explain Toyotas with Sudden unintended acceleration in cars that have the Denso pedal in them? I have heard that Volkswagen Jettas are also using the Electronic...


Hello, Zman777.

According to the material provided by Toyota, the Denso pedal does not have the alleged acceleration issue.

Also, according to information that has been provided by Toyota, the alleged acceleration issues is being caused by two possibilities;

One is additional placement(s) of floor mats on top of the factory floor mat. The extra mats are not secured, and can move around the driver side footwell, and, in the worst case scenario, move on top of the accelerator pedal, and trap in into the 'applied' position. I myself have experienced this mat/entrapment issue during a road test.

The other possibility is that certain accelerator pedal mechanisms may mechanically stick in a partially depressed position or slowly return to the idle position. Over time, the internal mechanism in the accelerator pedal my become worn. As a result of this wear, combined with certain operating and enviromental conditions, friction in the mechanism may increase and intermittantly result in the accelerator pedal being hard to depress and/or slow to return or, in the worst case, stick in a partially open position, increasing the risk of a crash.

In short, according to what we have been provided, the issue is mechanical, not electrical. The modification that Toyota dealerships are performing rectify this issue, and, this modification has been approved by the NHTSA.

Nowhere has it been found that the vehicles with the alleged acceleration issue have 'accelerated' without warning, as in sitting still, and the car is suddenly going 100 mph. None.

What 'could' happen, if the pedal 'was' sticking, is, in my opinion, an 'Unexpected Non-Deceleration' condition.

If you were going 15 mph, and the alleged issue appeared, when you let off of the gas pedal, the car would continue at 15 mph, and NOT accelerate to 100 mph, as has been falsely mentioned in the media.

Regarding VW, sorry, I cannot comment on VW, or any of their systems, I am not a certified VW mechanic.

I hope that this info helps you out.

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