Question about 1998 Honda Civic

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98 honda civic code po1399, intermitant missfire,

Multiple cylinders, 2,3,and 4, cannot find definition for po1399. could it be the EGR valve sticking open?

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The best way to test the egr is unplug the vac hose and put a vac pump and gauge on it and see if the egr moves in and out.
then u can check it for binding or sticking.

sometimes a chunk of carbon gets loose and gets stuck in the valve itself and therefor will need to be removed and the carbon cleaned out.

Posted on Jun 18, 2009


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2000 honda civic engine code po1399

Have you replaced the ignition wires?

Nov 30, 2013 | Cars & Trucks

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Check engine light on and was reading a p0505 code drove to the store and engine like started blinking got home hooked the code reader and now have another code of p0309 and p1399

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.

Jan 18, 2013 | 1998 Honda Civic

2 Answers

Misfiring code po1399 cylinder 3 and 4

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.

Hope this helps.

Aug 02, 2012 | Acura Cars & Trucks

1 Answer

I hava a 98 civic ex with a po1399 code and multiple missfire codes and it has NO egr valve....HELP NOW PLEASE

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.

Oct 02, 2011 | Cars & Trucks

1 Answer

Random missfire all cylinders 1996 honda civic sohc

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.

May 09, 2010 | 1998 Honda Civic

2 Answers

I have a honda civic lx 1998 I need to know what the troubleshooting code P1399 means? The engine number is D16Y7

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.

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 stuck open.

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.

Oct 14, 2009 | 1998 Honda Civic

1 Answer

1996 gmc1500 misses off and on at steady gas pressure or 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

Sep 24, 2009 | 1996 Chevrolet K1500

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My 96 honda accord is giving me three different code readings they are: P0303 cylinder 3 missfire, P0302 cylinder 2 missfire & P1300 multiple missfire detected, How do I fix this problem?

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.

Aug 30, 2009 | 1996 Honda Accord

1 Answer

1998 honda civic cel code 71-74

code 71 means #1 cylinder missfire 72 Means #2 cylinder missfire 73 means #3 cylinder missfire and 74 means #4 cylinder Missfire

May 29, 2009 | 1998 Honda Civic

2 Answers

How do you clean the EGR valve on a 99' Honda Civic?

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.

Mar 29, 2009 | 1999 Honda Civic

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