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Re: I got an diagnostic and it said the idle air valve is...
A idle speed motor will not cause your engine to run rough.It might idle high or stall. If your engine is running rough check your spark plugs and wires along with your cap and rotor first.
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from what you are saying with out me checking it, the mass air flow meter is bad it is located in the air induct hose{the ********* hose going to the air filter} has a plug on it and attached to the flex air intake hose with clamps now a trick I learded first is crank car let idle take a wrench and tap the air flow meter and see if it dies or runs rough if so change the air flow sensor Good Luck MIke L.
You don't clean O2 sensors , if bad you replace them . An only if there is a DTC - diagnostic trouble code or you check out O2 sensor performance with testing , using scan tool , lab scope or multimeter . A rough idle is usaully caused by a vacuum leak , a engine misfire , IAC - idle air control air passages clogged . There are videos on youtube on how to test to find rough running problems .
I have a 2005 f150,with a 4.6 and it idles rough and when you turn on the ac it wants to die. Checked the codes and there are no codes.Any suggestions?
Perform a valve clearance inspection and adjust if necessary. Tight or sticking valves will cause a misfire or rough running concern. Note: Perform valve adjustment when the engine is stone cold. 4cyl: INT 0.26mm EXH: 0.30mm (V6 engine are hydraulic and no adjust necessary.) Also check for a sticking or stuck open EGR valve. For diagnostic purposes only: Remove the EGR valve. Place a business card over the EGR passage and bolt the EGR valve back on. This plugs the EGR ports and if the misfire goes away the EGR valve is partially stuck open and is defective.
Check for low fuel pressure. Check for low compression. Check cam timing. Check for a weak ignition coil. Also don't over look the possibility of worn or broken engine mounts which cause excessive engine movement and engine vibration. -hope this helps
It has a carburetor where the fuel and air mixture is fed to the cylinder, tuning of the engine has to done by adjusting the flow(volume) of both fuel & air. In your case the fuel flow is more and for acceleration a butterfly valve allows momentary more flow of fuel to the cylinder & piston for the engine to compensate/respond to to demand of extra power. However the air flow is constant, thus in your case more fuel but same amount of air floods the cylinder and it feels like like some thing typical choking sound...............sodeep
does it do this more when its on a cold start up? if so they is a updated intake gasket. if you look at the base of the intake where it meets the head look for staining usally by cyl 1.
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