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Code 505 is a problem with the idle air control valve. Code 309 is noting a cylinder 9 missfire on engines with 10 cylinders which would not include yours. That may be a fluke or not the right number. Code p1399 is brand specific and for Honda it usually means random miss. The code 505 could be the idle control valve or a vac leak. The computer can not control idle speed by using the valve. The miss codes mean the cylinders are not producing power when they should be. Which may or may not be ignition. It could also be fuel or mechanical problems. If you have not replaced the plugs and done the usual maintenance stuff in the past year or two, I would start with the basics. Be sure and look at the inside of the dist cap and rotor.
On most Honda's when you get a misfire happening across the whole engine like that there are a few likely issues. the ignition coil if it's a single coil style or the connector at the distributor. They also have some issues with EGR's and plugged ports which can mess with the fuel trim numbers. It's important to check the fuel pressure and if possible a timing offset spec from the scanner whenever you're dealing with misfires on any vehicles Honda or not and determine correct pressure and flow whenever possible.
That is the code for "random misfires" so I would suggest that a new set of spark plugs and wires are the first order of business. Don't cheap out on the wires, you get what you pay for with these. Then get the code cleared and see what happens. You may have to go further but this is the most common cause. Hope this helps.
Check the EGR valve system. Honda's are prone to the exhaust supply to the EGR valve getting clogged with carbon at the valve port entrance. A clogged EGR valve can cause the engine combustion temperature to climb and then for pre-ignition miss-fire events to become common. The EGR is located inside the elbow of the air filter pipe at the back of the engine on the left beneath the coil. Anything you can temporarily remove to provide access the better. The EGR valve has two bolts, an electrical connector and a vacuum line attached to its top. Take it off and give it a really good clean, carburettor or brake cleaner works well in conjunction with cloths and brushes. Once cleaned like new replace everything including the vacuum line and electrical connector.
Get your self a EGR valve it is sticking or the EGR port is blocked i
can tell you how to test it you have a volt meter but i am 100% THAT
WHAT IT IS
Code P1399 is a pending misfire code.
HOW TO TEST
1. Check EGR position sensor voltage on the White/Black wire at
idle - look for 1.1 - 1.2 volts with the EGR valve closed. If the EGR
position sensor voltage is higher than 1.2 volts, the EGR valve is
2. Can unplug the EGR valve and apply power to the terminal on the EGR
valve that the Pink wire would normally go to and ground the terminal
on the EGR valve that the Black wire would normally go to and see if
the engine stalls at warm idle.
Try checking the EGR valve for sticking open, sometimes they will cause the missfire code ,, sometimes there will be a small piece of carbon holding the pintle open.. If you can get a data stream on the scantool check egr pintle position the desired position will be different from actual position.. hope ya find it
I would start with a full tune up. If it has never been done then that is the best way to start. Make sure that you gap your plugs. NGK plugs are the best for any and all Honda's. Let us know how it goes.
Pull vacuum on egr valve with engine idling and see if engine stumbles and tries to die until vacuum is released. If this DOES NOT happen the egr exhaust passage is plugged will need to remove egr valve assembly and remove carbon from passage into cylinder head.