I have a P0505 error code and my 1999 automatic honda crv has been stalling a lot. Uphill, downhill, I have cleaned the IACV, throttle body, bled the coolant and refilled with new coolant...not sure what else to do but check for a vacuum leak. It was stalling for about a month before the check engine light came on. Any suggestions?
Any cleaning or modification in air fuel mixture valves/ and sensors can modify their function which could trigger a false read on the ECU in the car. You will likely need to have someone with a code reader plug in under dash to reset the lights and give you a readout
There is a small motor that controls the amount of air the engine gets when you aren't using the throttle. The computer uses this small motor to control your idle. It sounds like it needs to be replaced. You can try cleaning it first with some throttle body & air intake cleaner.
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With a scanner, you can open and close the IACV. Most times it is just dirty. Remove it from the throttle body. use brake clean and soft brush to clean most of it. The n open it up and use a tooth pick or paperclip to clean the inside.
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 depositsthe 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.
P0505 - Idle Control System Malfunctionhttp://engine-codes.com/p0505.htmlForum CodePossible causes- IACV-AAC valve harness is open or shorted - IACV-AAC valve poor electrical connection - Faulty IACV-AAC valve
Your excellent description provides a very short list of possible culprits, since your vehicle's symptoms all appear during periods of higher fuel demand.
(1) fuel filter - clogged - your description is absolutely classic (especially stumbling upon uphill acceleration) for a fuel filter in need of replacement. (2) spark plug wire - one or more bad - an engine can muddle along while traveling over level terrain with one cylinder intermittently failing to fire, but try to go uphill (even the slightest grade), and the engine will skip badly and can even stall if asked to accelerate. (3) in-tank fuel strainer - clogged - same symptoms as clogged fuel filter.
The fuel strainer is a sock-like pre-filter attached to the input side of the in-tank fuel pump.
The troubleshooting section of the 1998 Honda Civic EX manual states:
Priority Action Part Type Cause 1 Inspect Throttle Position Sensor - Faulty or Incorrectly Connected Throttle Position Sensor. 2 Inspect Mass Air Flow Sensor - Damaged, Loose, or Faulty Mass Air Flow Sensor or Circuit. 3 Inspect Choke - Stuck or Improperly Functioning Choke. 4 Inspect Air Cleaner Tempature Sensor - Damaged or Faulty Air Cleaner Tempature Sensor. 5 Inspect Fuel Filter - Clogged or Dirty Fuel Filter. 6 Inspect PCV Valve - Plugged or Damaged PCV Valve. 7 Inspect Carburetor - Worn, Faulty or Damaged Carburetor. 8 Inspect Fuel Injector - Dirty or Worn Fuel Injectors. 9 Inspect Hose (PCV) - Clogged or Collapsed PCV Hoses. 10 Inspect Fuel Pump - Faulty Fuel Pump. 11 Inspect Fuel Pump - Low Fuel Pressure.
Here's a YouTube video describing hoe to replace a fuel filter on a 2000 Honda Civic (the closest I could find for your 1998).
Hello and welcome to FixYa!
This can be caused by a faulty IACV (idle air control valve). If the IACV is faulty the engine can misfire or can cause stalling. The IACV is located on the throttle body. You may need to just clean it for the strainer can be full of dirt. If cleaning doesn't resolve it then you may need to have it replaced.
Hope this helps and thank you for using FixYa! Have a good one!
This problem is common on all honda cars. As a first course of action, I strongly suggest that you clean the IACV (idle air control valve) by using a carburetor cleaner. The IACV has strainer and mostly clogged by dirt. If it's blocked the engine may stall and may have irregularities on acceleration.
The IACV is located on the throttle body secured by two bolts. You will need to remove the connector first before removal.
Hope this helps and thank you for using FixYa! Have a good one!
They can sometimes be fixed by cleaning-remove it and clean the part that goes into the throttle body, being areful not to spray the top of the unit (don't hold it upside down)-use throttle body cleaner, and remember to clean the bore where the idle air control goes into the throttle body. here is more information on P0505: