Question about 1996 Acura TL Series

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Idle surges it doesn't appear to be my air idle control valve , so I unplugged the stock air flow sensor on my air intake to trouble shoot and turned the car turned off plugged in and started it up again problem is the person whom owned the car prior to me took out all a.c components and appears to have messed with it's intake, now I disconnect the idle control and still surges but slower than when its been connected so im guessing it's function is still intact which brings me right back to the air flow sensor ... I noticed it doesn't start with out the air flow sensor does it mean it's function is still on point where should I go next or is that the problem???

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  • Acura Master
  • 14,036 Answers

Surging problem could be vacuum leak check all vacuum hoses on intake manifold.hook vacuum gauge to check engine vacuum could have intake manifold leak or could have bad spark plugs and wires.distributor cap and rotor need replacing.ignition timing off.if all is good clean fuel injectors and change fuel filter.if fuel pressure low or pump failing engine will surge real bad.if your air flow sensor bad or egr valve bad the check engine light will turn on.best have vechicle hook to code scanned check emission control system.many things cause engine surge dirty fuel injector faulty fuel pressure regulator have vechicle code scan to save from guessing spending way too much money.

Posted on Nov 19, 2013

Testimonial: "I'll get back to you ... threw the detailed response im sure to get back with positive info im going to run threw the egR and flow sensor 1st ... my "check engine" is on thank you."

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2 Answers

I have a 1993 ford explorer, idle goes up and down specially when the car is cold, what can i do to fix it.


Hello Carmelo Cortez,

The wise thing to do would be to get your codes read...
Beg, borrow or buy the FACTORY WORKSHOP
REPAIR MANUALS.... and trouble shoot yourself...

Alternative:
FREE technical service bulletins (TSBs) ...
and trouble shooting tips available for most popular USA market vehicle... (registration required) BBB Industries - FREE.
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My best advice would be to get your codes read...

Some parts houses & muffler shops will do this for free...
Even with the codes some of these issues can be a bit
of a riddle...

Not expensive nor difficult to do...

With your trouble seeming to be a cold issue...
Logically (Occam's razor) that would pint to your
(cold start) Idle air control valve ... Click here
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2003 ford explorer idle surged on me driving. Stopped and put in neutral went up to 3000 rpms. Fast idle now


Given all the electronic sensors that could cause this problem , your best bet is to take it to a qualified repair shop where they have advanced testing equipment . Just so you do spend all your money replacing parts ,,here is just a couple that can cause this problem ! Idle air control valve , throttle position sensor , vacuum leaks , map sensor . dirty throttle plate . mass air flow sensor . A qualified repair shop has a scan tool that can check data for all these sensors .

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96 ford f-150, well that was the first problem. I continued to drive it with overdrive turned off. Then it got so it surges when you stop at a light and it's in gear. You have to rev it up a little to...


What was the first problem ??
If you have a trouble code for the idle air bypass valve, it means the valve is not working, not that the valve is defective. You could have a dirty throttle body or sludge in the port for the valve. The computer uses the valve to control air entering the intake to regulate idle speed.

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1990 honda accord surges at idle, what can cause this?


It is likely a vacuum leak (from a hose or the intake manifold), or a sensor is not working properly (like the throttle position sensor, MAF sensor, idle air control ).
Spray carburetor cleaner around suspect areas to find a vacuum leak. The spray will be sucked into engine and raise idle. Spray around the intake manifold where it mates to head for leaks there.
Also check for trouble codes. Maybe a sensor threw a trouble code.
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We are trying to trouble shoot a 93 ford explorer engine problem. It has a V6 the engine will run as long as you give it gas but will not idle. We have replaced the mass air flow sensor. The engine...


The most common causes of no idle are vacuum leaks and clogged idle air passages. First check all vacuum hoses coming from the intake manifold. Check both ends and in between for leaks or poor connections. If no vacuum leaks, remove the idle air control valve (see picture below). Clean the valve and passages in the throttle body using carb cleaner. Also clean the throtte body itself.
Before putting the valve back in, plug it in and watch it while someone turns the key on. If the valve doesn't actuate, you might want to test it.
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  2. Disengage the wiring harness connector from the IAC valve .
  3. Using an ohmmeter, measure the resistance between the terminals of the valve.

Due to the diode in the solenoid, place the ohmmeter positive lead on the VPWR terminal and the negative lead on the ISC terminal.
  1. If the resistance is not 7-13 ohms, replace the IAC valve.

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Check engine light on


Diagnostic Trouble Codes OBD1
Mazda 02 Crank Position Sensor (NE Signal). 03 Cam Position Sensor (SGC Signal). 05 Knock Sensor. 08 Air Flow Sensor. 09 Engine Coolant Temperature Sensor. 10 Intake Air Temp. Sensor (Air Flow Sensor). 12 Throttle Position Sensor. 14 Barometric Absolute Press. Sensor. 15
and/or
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I have a 1991 Buick Park Avenue. Runs rough in


Here are the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours.
To correct this problem I want you to get a can of intake cleaner (ABOUT $5.00) from any local auto parts store like NAPA or Carquest, do not use carburetor spray, intake cleaner only or u will damage the Teflon coating inside the throttle valve and air bypass valve, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

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Engine surges 100rpm?


Here is the common cause of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

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Nissan Quest 2001 turns off when idle


Idle air control at base of throttle body. Passages could be plugged or idle hard stop needs adjusting.

Air Intake System Sensors Air intake system sensors include a heated resistor-type mass air flow (MAF) sensor and throttle position (TP) sensor; both supply data to the powertrain control module (PCM). The PCM also monitors engine speed.
Air Intake System Control Devices The idle air control (IAC) solenoid regulates idle speed by adjusting the amount of air allowed into the intake manifold. Adjustment is made by varying the duty cycle output by the powertrain control module (PCM). The PCM will increase the duty cycle for added mechanical or electrical loads. The IAC solenoid is combined with the fast idle control (FIC) solenoid which is turned on when the air conditioner is engaged to help compensate for the additional load. The IAC valve must be replaced as an assembly with the FIC solenoid.
Fast Idle Control (FIC) Solenoid The fast idle control (FIC) solenoid (Figure 1) compensates for idle speed change caused by the operation of the air conditioner compressor. The FIC solenoid is controlled by the FIC relay. The FIC relay is energized when the air conditioner clutch is energized and the relay allows the FIC solenoid to turn on and let an additional volume of air into the intake manifold.
Figure 1: Fast Idle Control (FIC) Solenoid
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Throttle Body (TB) The throttle body (TB) controls the amount of air that flows into the engine through a single butterfly valve. The single butterfly valve opening is determined by the accelerator pedal. The TB is cast with an air bypass channel and houses several emission-related components for the powertrain control module (PCM).
--------------------------------------------------------
Throttle Position Sensor (TP Sensor) The throttle position (TP) sensor responds to the accelerator pedal movement. The TP sensor is a potentiometer that transforms the throttle plate opening angle into output voltage and sends the voltage signal to the powertrain control module (PCM). In addition, the sensor detects the opening and closing speed of the throttle plate and sends the voltage signal to the PCM. Also, the TP sensor is used to determine the air intake when the mass air flow (MAF) sensor fails. This mode of operation is called Fail Safe.
The TP sensor integrates the idle (IDL) switch within the housing. The IDL switch detects when the throttle plate is closed and an idle condition occurs. The PCM is supplied with this input signal.

IDLE SPEED

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Apr 03, 2009 | 2001 Nissan Quest

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