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How to adjust idle speed on pulse phantom - Haltech HT020302 ECU Output - Idle Speed Motor

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How do I adjust idle speed?

You can't adjust the idle , There is a minimum idle adjustment set at the factory , you don't want to mess with that . The PCM / ECM ,engine computer controls the idle speed by the idle air control valve (motor) . You may have a dirty throttle plate mess with the base idle .Check out this video on ford base idle adjustment . Some one who didn't know cranked up the base idle causing problems Ford IAC valve test how to adjust minimum idle speed

Dec 19, 2015 | 1996 Ford Contour

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It idles fast if I turn the idle down it stalls running rich on top end at fast idle sometimes it will drop to a very low idle and shut off

adjust the idle mixture screws first and then adjust the idle speed screw to compensate
adjusting the idle mixture screws will alter the idle speed but when properly adjusted then adjust the idle speed screw,

Aug 24, 2015 | Motorcycles

2 Answers

How do I adjust the idle speed on a Toyota Corolla Verso

you can adjust the idle air right at the air intake

Feb 25, 2015 | Toyota Corolla Cars & Trucks

1 Answer

Adjust the throttle, it won't idle

If this has run good in the past it more likely that carburetor is needing cleaning and new gasket diaphragm install. As these diaphragm age they get stiff and won't work at idle as are operated by the vacuum pulses from the engine which are weaker at speeds; therefore, can not move stiffen diaphragm very well if at all.

Dec 31, 2014 | Echo Garden

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High rev issues when slowing down and very rough running

What DTC's are set???

SOUNDS like IAC disconnected or otherwise not right, Check the connector on the top rear side of the induction module, BUT download DTC's as a very first step. DTC P0505 is IAC

IAC Operation

The ECM controls engine idle speed by moving the IAC to open or close a passage around the throttle plate. The IAC motor has two windings and the ECM sends voltage pulses to the proper motor winding of the IAC to either cause the pintle to move in or out of the IAC a given distance for each pulse received. Idle speed is increased as the ECM retracts the pintle, allowing more air to flow through the throttle body and idle speed is decreased when the ECM extends the pintle, allowing less air to flow through the throttle body. The IAC position is measured in steps by a computer program called the H-D DIGITAL TECHNICIAN. A fully retracted pintle and open passage around throttle plate is indicated by a high number of steps and is correlated to an increased amount of air flowing through the throttle body. Conversely ZERO steps represents a fully extended pintle which is a fully extended pintle and a closed the passage around the throttle plate, which is an abnormal condition. The ECM resets the IAC each time the ignition is turned off, by sending sufficient pulses to extend the pintle and effectively close the throttle body. The reference point used by the ECM is the fully extended value in steps from which a set number of counts (steps) are then calculated by the ECM for use in setting the proper idle speed and IAC position. WARM IDLE SPEED is ECM controlled and cannot be adjusted except with Digital Technician. When the engine is stopped, the IAC pintle extends and then retracts to a fixed "Park" position for increased airflow and idle speed during the next engine start sequence. This key OFF reset procedure takes 10 seconds to perform. A special test lamp may be used to test the IAC operation. The color of the lights is not relevant to IAC operation. In NORMAL circumstances when the key is turned ON the test lights will alternately flash and then remain steady on to confirm ECM signals. When the key is turned OFF the lights should alternately flash and go out after the 10 second reset procedure. IF one or more of the lights fails to illuminate during key the ON/key OFF/key cycle a problem is indicated and there is also a remote possibility that one of the circuits is shorted to voltage. This would have been indicated by a steady light. In these circumstances with the Ignition Switch OFF, disconnect the ECM and turn the ignition ON again and probe the terminals to check for this shorted condition and fix it by repairing a faulty ECM connection or by replacing the ECM.

Diagnostic Trouble Code P0505 sets if theidle RPM is +200 or -200 from the preset idle speed and the IAC motor is at zero steps or at maximum steps for greater than 5 seconds. P0505 may occur with others for a multiple code situation and if so the other codes must be resolved first before dealing with P0505.

Engine Idle Diagnostic Tips
Engine idle speed can be adversely affected by the following: intake air leak;
2.improperly adjusted throttle stop or a misfiring cylinder;
3.leaking injectors will cause fuel imbalance and poor idle due to different air/fuel ratios in each cylinder.
(To check for leaky injectors, first remove the air cleaner and then with the throttle wide open, turn the key ON for 2 seconds and then OFF for 2 seconds five consecutive times and look fro any sign of fuel in the induction system. If there is any you will need to replace the fuel injector(s).;
4.vacuum leaks
5.contaminated fuel;
6.excessive oil in the crankcase (oil sumping);
7.TPS reading greater than 1% (possibly caused by a throttle cable misadjustment);
8.battery voltage reading of less than 9 volts;
9.a VSS greater than 0 will disable idle speed control; and
10loss of battery power to ECM pin 31.

May 23, 2014 | Harley Davidson FLHTCUI Electra Glide...

1 Answer

1998 Dodge Neon. At low speed or idling, the headlights pulse. They seem to pulse in time to the idling of the engine.

You need to check the amperage output of your alternator. Sounds like it is either too low of rpm`s from your engine or your alternator/regulator is going bad.

May 05, 2011 | Dodge Neon Cars & Trucks

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How do you adjust the high speed mixture screw? I have a Ryobi RLH1100a MK III 31cc line trimmer, and after changing the fuel lines, it will start but not idle more than about 3 - 5 seconds before it...

Hi montex124, I will try to help. In the past few years carb makers have been making changes. Some carbs have no adjustment at all, the ports are all fixed inside the carb. Other carbs have only the idle speed mixture screw that can be adjusted, like yours seems to have. Is this screw you mention at the top and completely outside of the carb to adjust the throttle? If it is it's probably the idle speed screw which can be adjusted to any idle speed you want and has nothing to do with the air fuel mixture but If it is right next to the idle mixture screw, it might be the high speed mixture screw but is capped so it can't be adjusted. The low and high speed mixture screws should be marked next to each screw H and L.
The 1 1/2 turns suggested is sometimes just right but other times has to be adjusted, so you can try adjusting it to get your idle but maybe adjust the idle speed screw first to get a higher RPM so it doesn't stall on you. Like I said earlier it just adjusts the throttle, and is like when you are using it, and giving it gas as they say. I hope this helps just a bit. Regards and good luck. Get back to me if you need more help or just let me know how you did. Denis.

Feb 28, 2011 | Ryobi Garden

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I have a 1998 Acura 3.0 CL and the radio had an error 3 last week. I had to take the console and radio out in order to find the radio serial number and got the radio code from Acura, since mine was...

I don't see this as related to the console. This issue is usually caused by the idle air control valve. The valve may be bad or possibly the wiring. If it's the wiring, normally the computer will turn on the engine light.
You can check the valve operation using a common obd2 scanner in data mode.
Here is more info from
Engine idle speeds are controlled by the PCM through the Idle Air Control (IAC) valve mounted on the throttle body. The PCM sends voltage pulses to the IAC motor windings causing the IAC motor shaft and pintle to move in or out a given distance (number of steps) for each pulse (called counts). The movement of the pintle controls the airflow around the throttle plate, which in turn, controls engine idle speed. IAC valve pintle position counts can be observed using a scan tool. Zero counts correspond to a fully closed passage, while 140 counts or more corresponds to full flow.
Idle speed can be categorized in 2 ways: actual (controlled) idle speed and minimum idle speed. Controlled idle speed is obtained by the PCM positioning the IAC valve pintle. Resulting idle speed is determined by total air flow (IAC/passage + PCV + throttle valve + calibrated vacuum leaks). Controlled idle speed is specified at normal operating conditions, which consists of engine coolant at normal operating temperature, air conditioning compressor OFF, manual transaxle in neutral or automatic transaxle in D .
Minimum idle air speed is set at the factory with a stop screw. This setting allows a certain amount of air to bypass the throttle valves regardless of IAC valve pintle positioning. A combination of this air flow and IAC pintle positioning allows the PCM to control engine idle speed. During normal engine idle operation, the IAC valve pintle is positioned a calibrated number of steps (counts) from the seat. No adjustment is required during routine maintenance. Tampering with the minimum idle speed adjustment may result in premature failure of the IAC valve or improperly controlled engine idle operation.

TESTING The IAC can be monitored with an appropriate and Data-stream capable scan tool

Oct 02, 2017 | 1998 Acura CL

1 Answer


It might be bad gas or a plugged filter or it might be a bad mass airflow sensor.

May 03, 2009 | 1996 Honda Civic

2 Answers

Phantom exhaust

At slow speeds, the Phantom's exhaust gases are sent through a longer route than they would be at high speeds, a process which deadens sound while the Phantom is driving in a city or other environment at "parade speeds."

May 15, 2008 | 2000 Rolls Royce Rolls Royce Phantom

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