chico00 Posted February 18, 2005 Share Posted February 18, 2005 Man...I am cursed with the ol' CEL PO400 syndrome. (AKA Misfire 4). I have done just about everything I have taken from the previous posts (thanks everyone) but the light still keeps coming on and blinking at me. I am thinking it might be the EGR Solenoid Valve but I am not sure. I am not really sure I know what it does. Does anyone know? This is what I have done so far: Plugs (autolite), Wires (Belden - NAPA), Coil Pack (OEM), Fuel Injector @ 4 (OEM), MAF (Junk Yard- OEM), Cleaned the throttle body and all the tubes,& Cleaned the EGR Valve. These are the symptoms now (before it was idling rough): Idles better but not all the way normal Feels like it is going to stall out when approaching a stop Engine temp rises abnormally when sitting in traffic or at steady speed (45 mph). Otherwise, it drives great. Oh yeah one more thing. I have very leaky valve cover gaskets. They need changing bad but I need to get this CEL to stop coding the computer so I can get it smogged. I am two months w/o tags. Thanks for any help -Brett Quote Link to comment Share on other sites More sharing options...
simpreza2 Posted February 18, 2005 Share Posted February 18, 2005 Hey! I am having the same problem. Well almost the same, my idle is ok. I have misfire on cyl 4 but it hasnt been as much of a problem lately and Im also using 89 instead of regular gas and it has helped a little. I replaced plugs, wires, and coil pack. I also cleaned out egr system and hoses but im still getting misfire and I also get a erg cel too(I dont remember what it was) I havent checked into the egr stuff yet b/c all the parts are expensive and I dont hav the cash right now to fix it. Quote Link to comment Share on other sites More sharing options...
bearbalu Posted February 18, 2005 Share Posted February 18, 2005 P0400= EGR Flow malfunction P0304 = Cylinder 4 misfire. Which one do you have? If it P0400, good news, obviously you need to focus on EGR components. If P0304, causes can be various... Quote Link to comment Share on other sites More sharing options...
chico00 Posted February 18, 2005 Author Share Posted February 18, 2005 P0400= EGR Flow malfunctionP0304 = Cylinder 4 misfire. Which one do you have? If it P0400, good news, obviously you need to focus on EGR components. If P0304, causes can be various... Woops...your'e right. I am getting PO304. I was looking @ ALLDATA before I posted and read about the EGR system. I would have thought if anything was wrong with the EGR, the system would code it specifically (i.e. PO400) A mechanic buddy of mine told me to pull the EGR off and close off the system by making a seal gasket from a coke can. He said to drive it around a day or so and see if anything changes. He said it would probably drive better by bypassing the system. Well see. Quote Link to comment Share on other sites More sharing options...
bearbalu Posted February 18, 2005 Share Posted February 18, 2005 Could be EGR...cars are strange. Other things to check - overheat - hope it's not head gasket...check for exhaust in coolant overflow...search for dollar bill test on this forum for sticky valves... Quote Link to comment Share on other sites More sharing options...
gbrand Posted February 18, 2005 Share Posted February 18, 2005 I would do a compression test before doing much else. Make sure that there is not something wrong with the engineesp on the cylinder that is giving you the code. Quote Link to comment Share on other sites More sharing options...
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