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My Toyota 3f motor will not idle below 1200 RPM even though the carbi throttle adjustment screw is all the way out ??

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Your cable is adjusted short.

Posted on May 04, 2017

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Posted on Jan 02, 2017

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Toyota Corolla 2006,idle at 1200 rpm,which is to high,should idle at 750 rpm,what could be the problem?


Check out where the throttle cable is mounted to the carburettor swivel, which opens and closes the throttle. With the engine running see if the swivel can be turned back to the stop position.This is an adjustable screw, typically with spring around the thread to resist undoing.
If the swivel is already back to the stop. its a simple repair to turn the stop screw back to allow the swivel to close the throttle more.
Sometimes the cable prevents the throttle from fully closing and the reason has to be investigated. Such as
weakened return spring or inner cable requires some lubrication.

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Choke problems


I take it that you have a carby in which case adjust the choke cover so that the cam engages the throttle lever and holds the throttle open until the bi-spring in the choke cover moves enough to move the cam out of the away allowing normal idle. If you have efi (Not from your choke word) then run fault codes and see which sensor is faulty. There should be an idle speed around 1200 RPM idle in efi for around 3 minutes and then the idle should drop back.

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I have a 1981 toyota pickup with a 22r motor.It wont idle Have to feather it to keep running runs good at high rpm replace spark plugs rotor cap and rotor, new fuel filter.Hard starting to.but runs. have...


Check your set screw, and make sure it's not too low. Adjust the screw to the point that where it idles at the proper speed. Also, maybe check your throttle cable for too much slack.

Aug 27, 2013 | Toyota Pickup Cars & Trucks

1 Answer

Airscrew


Before you could adjust the mixture, make sure that the spark plug gaps, ignition timing and valve clearance are all OK.
- Start the engine and bring it at operating temperature.
- Adjust the throttle stop screw to bring it at the stable rpm.
- Turn in the idle mixture screw while observing the engine speed till the engine starts to stall. At this point turn out the idle mixture screw and keep on opening slowly till the engine acquire the most stable rpm. Finally adjust the throttle stop screw to obtain the desired idle speed.

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Twin hs2 su carb linkage diagram


YOU dont need a diagram for twin carbys as put them on the manifold back off all throttle linkage and adjustment screws make sure thay are all down, and turn both screws down till they touch, now back off the jets nuts under the carbys and then undo them 2 turns only[thats the ones the choke move up and down] now HB on out of gear a little choke start engine adjust 2 screws 1 more turn each and choke in
make sure you have very thin oil in pistons, then when running adjust jets 1flat at a time when it runs smooth lock up the linkage and adjust screws till idle at 600 RPM.

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1 Answer

How to Adjust idle RPM for a 2003 honda accord. some people were talking about a screw on the throttle body. but I can't find that screw. How do you go with adjusting this and where to find it ?


There isn't an adjustment screw that you really manipulate. The computer dynamically controls the throttle using the information it gets from the throttle positioning sensor (TPS) on the throttle body. The TPS is secured with tamper proof bolts that the head breaks off when torqued down. If you remove the throttle body and extract those bolts, then you can add bolts/screws with head and can be loosened and tightened. Then you can move the TPS back and forth to adjust the idle.

I wouldn't recommend doing this though: if there is and issue with the idle, it is because something is malfunctioning, not because it needs to be adjusted.

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1 Answer

When i drive my 2003 expedition there is low idling but when i come to a stop the engine will shut off. what may be the cause of that


The issue is most likely the setting at which you idle throttle is set at. When you come to a stop, your brake system takes power, and if the idle speed is too low, then the call for power will stall the engine. To fix this, look for where the throttle cable connects to the throttle body. Where it connects will be a screw that you can turn that will change the angle of the throttle plane. This is called a set screw, so be sure you are not turning a screw that holds the throttle assembly together. The screw most likely has a spring in between the head of the screw and the throttle plane. To adjust this properly, turn the engine on with the hood open. Keep the engine on and adjust the screw left or right until the RPM indicator points right above 1000 RPM. A good idle speed for a SUV is 1200 RPM.

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I cannot lower the rpm under 1200 on a civic 1988 twin carby! accel. cable ok! idle screw out all the way! what can be the problem? please help!!!!


probably a vacuum leak check all vaccum tubes going to intake assembly. Also look at throttle body plate with intake tube off and make sure it is closing all the way.

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3 Answers

Idle at 250 rpm


Idle Speed Control (ISC) Motor OPERATION Eagle Throttle Body Fuel Injection (TBI) System NOTE: The Eagle TBI system is used only on 2.5L Premier engines. The Idle Speed Control (ISC) motor is mounted to the throttle body and controlled by the PCM. The throttle lever rests against the initial adjustment screw of the actuator (plunger). The idle speed is not adjustable. The initial adjustment screw is only used to establish the initial positioning of the actuator when the ISC motor has been replaced. The actuator extends or retracts to control engine idle speed and to set throttle stop angle during deceleration. Based on inputs from the various engine control system sensors and switches to the PCM supplies current to the ISC motor to adjust the actuator position for the particular operating conditions.
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Aug 05, 2010 | 1995 Dodge Spirit

2 Answers

Cold engine, idle rpm 1200 is this normal? 2002 Toyota Carollia


you need to replace the throttle position sensor on the intake.

Dec 16, 2009 | 2001 Toyota Corolla

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