Question about 1994 Honda Civic

1 Answer

Idle problem hi,brother. i got idle problem of my car.i try my best to repair already but its the same. i change a new IACV and used throttle body,new tb gasket.new denso iridium plug.manifold also clean already.any idea for this problem?

Posted by on

  • Anonymous Mar 23, 2014

    replaced everything but throttle body cleaned it still have a problem

×

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that hasĀ over 10 points.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 14 Answers

You may also wnat to check timing and/or fuel pressure... Any aftermarket parts on it? And is it low idle high idle or just all over in RPM's

Posted on Aug 04, 2008

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

Tip

Idle Air Speed Control valve on engines



1.4) IACV Idle Air Control Valve - Idle Speed Control Unit(actuator)

What is it? The idle air control valve is an electrically driven mechanism that allows additional control over the throttle at idle.

Where is it located? The IACV is located on or near to the throttle body and consists of a small device with an electrical connector.

How does it work? When the throttle is closed the throttle plate closes offair from the inlet manifold and normally this would cause the engine to stall immediately. To allow the engine to keep running the ECU makes use of the IACV system to permit the ingress of a limited amount of air. The IACV device is seen in two forms either a) a small motor driven valve on a passageway allowing air indirectly to pass to the inlet manifold plenum or b) a motor located on theTPS assembly that opens the throttle plate by a small degree to allow air through directly. Both systems are designed to allow air to by-pass the 'closed' throttle plate to maintain engine idle. The IAC also helps throttle respond to additional power demands being made on the engine such as using the power steering, air conditioning or moving the (automatic) transmission selector into 'drive'. Somecar manufacturers also have a separate 'hot idle' valve system and this is designed to operate for a relatively short period just during engine warm up. Such hot idle systems are accompanied by electrically driven IAC valves to maintain engine idle in the face of additional power demands.

Symptoms of faulty IACV
Associated OBD2 error codesDTCs: P1508, P1509

  • Poor starting, sudden stall: If the IACV fails to open or the inlet/exit ports are clogged shut with oily deposits the engine may ignite and then promptly stall. The engine can be kept running by pressing the accelerator. However any additional demand on the engine such as power steering or putting the car into drive (automatic) will cause the engine to stumble badly or stall.
  • Engine stall at stop sign: Even with the engine is warmed up, if the car comes to a halt such as a stop light the engine may stall. The engine will often restart immediately with little trouble

Thisdiffers from:-
a) TPS fault - engine stall when theaccelerator is depressed quickly, but will often restart without much trouble.
b) CKP or CMP fault - engine cuts out without warning and is resistant torestart until cooled down

How to check? Physically remove the IACV, keep the electrical connection and examine the state of the valve for carbon build up. Blank off the exposed IACV port(s) on the throttle body and turn the engine on; you may have to give it extra throttle until the engine has warmed up. Monitor the IACV valve movement in response to additional loads (power steering inputs etc) the valve should open and close according to demand. When refitted this action results change in engine speed in response to increased power demand.

The electrical connector to the IACV can have 2 or 4 pins:-
2pins: resistance between socket pins should about 10 OHMS +/- 3 OHMS. If this resistance is very high then there is break and the IACV is at fault.
4pins: resistance between diagonally positioned pins should be about 20 OHMS. If the resistance is very high this indicates that the IACV is faulty.

Resistance between the actual metal valve body and either of the socket pins should be greater than 10,000 OHMS. If there is little or no resistance thenthere is a short and the IACV is faulty.

How to fix? If the motor of the IACV has failed (no movement and fault resistance values) then replace it. If the valve is gummed closed by baked oil and carbon then clean it thoroughly with WD40 or carburettor/choke cleaner spray and a cloth. Similarly if the entry and exit ports on the throttle body to the IACV look dirty again clean them out thoroughly.


NEXT 1.5) TAC Throttle Actuator Control

on Jul 15, 2011 | Mercedes-Benz E-Class Cars & Trucks

1 Answer

My 02 chevy trailblazer's rpm fluxchuates when


Many of the 6 cyl. engines are prone to carbon build-up in the throttle body. If this is the case, it is best to clean it off the car and is fairly easy to do. Remove the snorkel, 1 electric fitting on the throttle body (a little tricky) and one vacuum line on tb as well. Four bolts remove the tb from the engine and the throttle body can be cleaned with throttle body cleaner from any auto supply store. An o-ring attaches the tb to the engine so that you will not destroy a gasket during the repair. Pretty easy and should take less than 1 hour, but be careful of sharp edges in the throttle body.

Nov 04, 2011 | 2002 Chevrolet TrailBlazer

1 Answer

99 sl1 with 1.9 has high idle and will not idle below 1200 in drive


remove the throttle body (4 bolts) and then remove the idle air control (bolted to the TB, between the firewall and the throttle body)-clean the TB, the Idle air controller and remove the Throttle Position Sensor (opposite the IAC) and clean it if necessary. The IAC carbons up on these cars, as does the Throttle body-I know, I have a 99 SL with 180,000 miles, it is almost like an oil change as they get older.

Feb 18, 2011 | 1999 Saturn SL

1 Answer

Car has in a fuel injected 1500 cc engine ,hard to start and uneven idle usually jump from 1500 to 3000 rpms when it should be idling


You probably have a bad Idle Air Control Valve (IACV). If it does not control the idle correctly , you can find yourself driving 50 MPH with out touching the gas pedal. The IACV is located on the throttle control valve and is typically held on by two or three small screws. The price for an IACV can run from $25 to $500. I purchased a throttle body for $40 , removed the IACV, and saved $400.

Dec 19, 2010 | Mitsubishi Lancer Cars & Trucks

1 Answer

My 96 nissan sentra shuts down at times in idle at stop light, allready installed new plugs roter and plug wires


Disconnect the air ducting between the air filter box and the throttle. Clean your throttle body interior with a cloth and plenty of carb choke spray (WD40 is good too). Idling is controlled by the engine's computer and the Idle Air Control Valve IACV . This device allows air passed the closed throttle plate when the engine is at idle. Locate the inlet port in front of the throttle plate in the inside wall of the throttle body. Locate the IACV on the outside of the throttle and remove it. Give it and associated passageways a really good clean. Make sure the valve and valve seat are free of crud. Re-assemble and this should cure the problem

Sep 21, 2010 | 1996 Nissan Sentra

1 Answer

Idling problem toyota altis


Either there is a vacuum leak causing the high idle, or
the IACV is bad or being controlled by the computer to make idle speed too high:

To change the IACV refer to the following:
Idle Speed Control (Idle Air Control) Valve Removal & Installation To Remove:
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Remove the throttle body. Idle speed control valve toy_cor-04-18-1187.gif

  3. Remove the 3 mounting screws from the throttle body. Remove the idle speed control valve and gasket.
To Install:
  1. Using a new gasket install the idle speed control valve on the throttle body with the 3 mounting screws.
    • Tighten 33 inch lbs. (3.7 Nm).
  2. Install the throttle body.
prev.gif next.gif

Jul 16, 2010 | 2004 Toyota Corolla

2 Answers

What is a throttle body failure. and if not repair what will happen to my car suzuki 2004 verona has since oct 17.2003 the mileage now is 41,880. how much do throttle cost.


this throtthle body is electronicaly managed. the las thing you want to do is clean it with carb cleaner it will sip into the motor mechanism and ruin the circuit board. i say this because traction control idle control are both intergrated in this throttle body via a motor that controls the flap inside even though it still is ran by a cable. most electronic tb's are completely motorized requiring no cable. these you do not want to clean like that. you use a wet rag with non ether cleaner its harder but beats $500 plus for a new TB once it fails because of imporper cleaning.
the tps is also intergrated...

May 25, 2010 | 2004 Suzuki Verona

2 Answers

The car starts and immediately stalls unless I


Hey Jruthesq

The 850 is equipped with an Idle Air Control Valve (IACV) which supplies the engine with air when idleing (a necessity since the main throttle body valve is completely closed when no throttle is applied, thus the engine would lack air without the IACV when idleing). The IACV is suspended in a rubber mount on the front of the throttle body itself, and is easily removed and inspected/cleaned. If it's dead a good cleaning usually gets it going again. Also make sure that the air from the IACV is unhindered on its way from the IACV to the throttle body (it's actually common for the holes in the throttle body to be gunked up so bad by hardened carbon deposits that one sometimes needs a nail or even a drill to open it up again).

Just thought I'd mention this since you said that the gas needs to be feathered for the engine to start. When you press down on the gas the main valve in the throttle body opens up, closing the IACV and supplying the engine with enough air.

Oh and if your fuel pump relay is a green one marked 103 you should replace it with the new and improved red one. The relay is located under the fuse box cover under the hood. Remove the 4 torx srews holding the cover in place and you'll see the relays under there.

Good luck mate!

Jul 01, 2009 | 1997 Volvo 850

Not finding what you are looking for?
1994 Honda Civic Logo

Related Topics:

74 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honda Experts

yadayada
yadayada

Level 3 Expert

63801 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21990 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

Are you a Honda Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...