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Missfire 0300? do you know where the egr valve is

Missfire 0300? do you know where the egr valve is located and could this be the problem? Also, I just had to change the altenator belt and now the a/c quit?

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Failed emmissions codes 0400-0443-0300

P0300 Random Misfire, means any cylinder at anytime.

P0400 Exhaust Gas Recirculation Flow. EGR passages are full of carbon
clean passages and misfires may go away

P0443 Evaporative Emission Purge Control Valve circuit.

now just because a code is present doesn't mean a part/sensor is bad, just where to look and to test.

Oct 10, 2012 | 2001 Nissan Maxima

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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

1 Answer


Have you changed your coil packs?

Apr 08, 2010 | 1996 Pontiac Grand Am

1 Answer

HAVING PROBLEMS GETTING IT TO PASS DEQ I GET 2 CODES - 0300 random/multiple cylinder misdire detected, 1406 manufacturer specific coad, witch indicates EGR valve, i've replaced EGR Valve, plugs and wires...

These cars do have problems with coil packs, have you replaced these yet, if not then i would advise this be your next step. If you can get the ignition plate that goes under the coil packs also.

Apr 08, 2010 | 1996 Pontiac Grand Am

1 Answer

I was just trying to get OBDII codes on a 2001 Blazer

po300 is random missfire code not sure about the other

Apr 07, 2010 | 2001 Chevrolet Blazer

1 Answer

Car is throwing code 1406, already replaced EGR vlv no change. car randomly missfires, when shutdown and restarted it is ok for a while.

did you change the DPFE sensor and the EGR valve selnoid, very common when one goes the others go as well and will show as a bad EGR valve

Jan 11, 2010 | 1995 Chevrolet Camaro

1 Answer

Check eng.light on mis fires around town but not on highway had new plugs ,wires fuel injectors cleaned,new coil pack. ect. no one knows the problem,missfires on two cyl,

Your EGR valve appears to be leaking. The valve is most likly dirty or sticking causing the exhaust gasses to enter the intake manifold and causing the missfire. At highway speeds is when the exhaust gas is allowed in the engines intake system for combustion chamber cooling and emissions purposes.
I would suggest removing the EGR, cleaning the valve and have the valve checked.
Good luck.

Dec 02, 2009 | 1996 Ford Windstar

3 Answers

Egr vale n codepo300

random/multible cylinder missfire. could be coils, plug wires, plugs,

Oct 06, 2009 | 2003 Chevrolet Monte Carlo

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