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Re: honda accord trouble shoot
Could also be a dirty or clogged idle air control valve - try a Seafoam treatment (it's available at the auto parts stores - use about half a coffee cup worth through a vacuum line into the manifold, per the directions on the can). Easy treatment and it can work wonders for the way your car runs.
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map sensor or other sensors usually set off an obd ll code look at air filter gauge its on duct that runs from air box to throttle body if it is in red change filter also check and or change fuel filter these to filters usually dont set off a trouble[ obd ll ]codes also when was last tune up --wires,cap,plugs,egr cleaning,replace filters etc.your most likely problem would be the fuel filter
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
bad ignition,air flow sensor that keeps leaning out the mix and it stalls,bad iac idle control motor,start with a good tune up.cap rotor,wires plugs air filter and clean the throttle body.some honda cars have bad egr valves and the intake manifold has to come apart because it is plugged up inside with carbon.