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Throttle body If the throttle body flap doesn't have its proper flapping motion n gets stuck from time to time , can this cause the car to run accelerated from time to time .

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  • Francisco Feb 14, 2012

    OK , but if the butterfly gets stuck for whatever reason , can this action cause the car to accelerate when ever it wants to . I looked at all the components of the body throttle n they all check ( besides it being warped i mean ) out but the butterfly seems to stay stuck only when its proper place without it the spring works fine with good spring action .

  • Francisco Feb 14, 2012

    Never mind , brain **** . Ok it's dangerous , I've learned that 1st hand . Can the acceleration also happen while the car is parked also if that flap doesn't move at all until pressure is applied via gas pedal to allow air to get in . I'm just trying to understand the mechanics of the butterfly n its sole purpose . I understand it opens when accelerating , but does it stay a little open when just idling cause gas is going into the intake right n it needs air also. Sorry to bother u who's reading this but any help is GREATLY APPRECIATED.

  • Francisco Feb 14, 2012

    The car is a 92 Chevy Lumina Z34 , unless I'm wrong the manual is saying it's a Sequential Fuel Injection ( SFI ) for a 3.4 engine . I'm currently getting ready to go on vaca but as soon as I correct the problem I'll let you know . Thank you and God Bless you . P.S. if the car is having wheched problems on the soleniods how does one fix that .

  • Francisco Mar 23, 2012

    Hey I'm back from vaca , I put the intake back together n the car is still running accelerated . I did noticed that the mass air flow if taken off but not unplugged the car runs better or if I put my finger tip in the hole where it breaths its run even better , I have two of them so i switch them to see if it changes n still the same . I'm back tracking to the cars computer to its origin n starting there is that a safe start . I know now it's definitely electrical . can u give some input again , remember its a 92 chevy lumina Z34 . Headache of a car .

  • Francisco Mar 26, 2012

    Hey I'm sorry but it wasn't the MAF it was the MAP sensor . I got a new one n its still doing the high idle 2800rpm . It only goes down when I remove it from its base but don't unplug it . This car was sent to a mechanic school n it had no vacuum leaks n no apparent mechanical problems , they did say that they believe that it was an electrical problem . I was told the same thing from a different mechanic . But where to start . My last resort is to replace the ECM which I believe don't need to b reprogram , Its only costing me $20 through a junk yard . If this don't work then I'm baffled . Maybe I'll try sending the car to an electrical school for cars . I was reading other forums n I read that the MAF actually isn't necessary is that true. Sorry to bother u .

  • Francisco Mar 26, 2012

    Sorry how do u reflash the base idle n how do I check to see if the coolant sensor is stuck on " cold start " i know where i is .

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  • Cars & Trucks Master
  • 5,537 Answers

Absolutely and DANGEROUS. What you need to do is isolate the problem before fixing or replacing parts.

Disconnect the throttle cable. Push on the disconnected cable from the inside of your vehicle. Find out if cable is sticking.

If not, go to the disconnected throttle lever. Try to position it to stick. If it does stick there are several reasons. The TPS switch is binding and needs to be replaced, or the throttle plate may have a missing or loose screw. The screws are usually flared once they are installed and are not meant to be removed. Bad things if engine ate one.

The throttle housing may show signs of binding from the butterfly flap. If the housing was in an accident, the housing may be warped. Carbon buildup can jam action too.

Bad return spring on throttle housing. You need to replace spring or get different throttle body with a strong spring.

All of these parts should want to close more than to open.

Posted on Feb 12, 2012

  • 1 more comment 
  • fordexpert Feb 14, 2012

    The butterfly flap will be partially open at idle. I understand that some newer cars just have wires going to them, but if you have the throttle cables, my solution is valid. I answer many questions but currently do not see the Brand of your vehicle on what I am looking at on my page.

    I am relying on your description of the Butterfly flap and if it is sticking on its own, without a throttle cable hooked up, then it is a problem. There should be a switch mounted to one side of the airhorn housing and this switch is a TPS sensor. It tells the computer that the foot pedal is mashed and to add gas and change the spark advance.

    This switch, when attached to the butterfly shaft, should move smoothly and if the butterfly flap does not stick with the TPS removed, the TPS is bad.

    You said there is a warped part? If that is the case, you should try to find a rebuilt, salvaged, or new part to look at. The shape should allow the butterfly flap to move and close smoothly.

    I am relying on your description of the Butterfly opening and that the problem is centralized there. But on some manifolds, there are parts called ISO motors which are solenoids for airflow. The chambers in which they operate can soot up and jam whech prevents the valving on them from closing. Other engines use parts which are called "Runners" to shift manifold airflow inside a divided chamber.

    Go to an autoparts store after you solve the actual sticking problem and find out if your vehicle has these parts on the engine. These new terms "Iso motor" and "runners" came about because the Intake manifolds had a change which went beyond what the old style manifold could regulate. The old manifolds could not do the job and these parts were part of what was added to many engines to get the airflow regulated.

    If either of these 2 parts do not close properly, the engine will receive more air and will rev up.

  • fordexpert Mar 24, 2012

    It seems like by plugging the airhole for the removed airflow sensor you cut down on the air leak. Its time to break out the Vacuum pump and check the EGR and all of the Vacuum solenoids, the PCV, the brake booster, and any vacuum lines to the trans.
    Its not impossible for the programming for base idle to be scrambled and need a reflash.
    Check your coolant temperature sensors in case the "cold start" loop is stuck on.

  • fordexpert Mar 27, 2012

    Some of the brains are rewriteable and a Dealer or person with a computer chip full of instructions would need to hook up to the brain and download. The temp sensors need to send a warm signal to the brain to knock it out of the cold cycle. A broken wire would keep the signal from reaching the brain or a bad sensor would not send the signal.

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SOURCE: Sticking accelerator

Two major reasons for this are dirty throttle body bore (clean with carb cleaner) and frayed throttle cable (replace cable)

Posted on Sep 22, 2009

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SOURCE: Cleaning of throttle body

Sometimes sporadic Idling can be caused from an improperly installed mass air flow meter, it is possible that you could have damaged it when you cleaned it, i would try taking the sensor plug out and giving it a good day or two to dry completely out and making sure that everything is the exact way that it was when you disassembled it, you may need to replace the AFM or Air Flow Meter.

Posted on May 04, 2009

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SOURCE: Petrol filler flap stuck in locked position

As a temporary solution you can normally force it open use something like a credit card (or credit card size piece of stiff plastic)

This forces it open without damaging the paintwork.

For a long term solution it will have to be dismantled to be cleaned up and greased etc

Posted on Sep 25, 2009

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SOURCE: 1999 Buick Regal temp problems

warm air come out on the passager side you got dual heating control the motor that control the hot and cold is stuck that hapen when the car sit there a long time or the setting dont move if it passager side under the dash you got the heater box about 3/4 down you got a square electric motor start the car gently tap the motor with anything you got most of the time it gonna start moving play with the heater control to see it move good luck pierre

Posted on Jun 24, 2008

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SOURCE: fuel tank neck missing a flap

it is just stuck as long as you have a gas cap on there is not going to be any problem the cap is just there so when you fill your tank there are no fumes coming up from it

Posted on Nov 02, 2009

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