my04 endeavor left the house running fine in the am. 5 mins. down the road and the first stop it started extremely rough idle and almost stalling along with delayed starting it has 0300 multiple miss fire code along with insufficient gas re circulation code,i have neglected to change/clean bank 1and2 o2 sensors,please help.the vehicle shows no sign of trouble once its under way and traveling down the high way
Hi,I have several questions to get us started.How many miles are on the vehicle?Have there been any recent repairs, maintenance or upgrades performed recently in relation to the development of this problem?Am I correct in understanding the only codes are the P0300 and EGR insufficient flow code or are there O2 codes as well?Do you have access to any sort of scan tool (besides a code reader)?Thanks
a.115k b.negative c.there were 02 codes bank 1and2 d.no because the problem was so ebrupt i wanted to believe it was fuel related how ever after fuel treatment fresh gas and 25 miles of driving there was no change in the performance
Hi,The fuel is in the back of my mind as well, though I was thinking in addition to fuel condition I was considering fuel pressure too.Do you recall what the O2 related codes were (there are numerous ways these can fail)? Specifically do you recall if the words "Heater", "Range/Performance", or "Activity" were in the descriptions?Have you checked to see if any new codes have popped up since last check?
yes they were i am not sure which, but the the codes were p0155,p0141 po401 and 300 i have had my daughters boyfriend out driving it and he just got back and said it was running fine, maybe i did not drive it far enough for the treatment to fully work i despise e-10 and possible phasing/seperation
Thanks, XXXXX XXXXX out.The O2 codes are not a concern right now as they are both heater circuit issues.... this just means that the O2 sensor is not brought up to operating temperature as fast as would be optimal, it takes until the exhaust gets fully hot to be optimal.This has no effect on your running condition overall and they should not be considered a contributor to your problem.Did you use a high alcohol content fuel in the vehicle? This vehicle is not designed to handle 10% ethanol or any higher (10% is where it starts causing problems on this vehicle).As I mentioned before, the fuel condition (both quality and pressure) were on the fore front in my mind, and the reason is because of the P0300. This code is indicating a misfire across the entire engine.... that can not be narrowed down to any particular cylinder. If you had an ignition issue (plug, coil, etc), the computer would be able to identify the individual cylinder that was misfiring and code it accordingly. Even if all six cylinders were misfiring it would still be able to detect that and set P0301-6.The only reason you will see a P0300 with no other misfire codes is due to a fuel issue (be it the gasoline quality, the gasoline pressure, or the air to gas mixture)Knowing this, if you managed to get some high-alcohol/ethanol content gas in there this is a very big suspect at this point, knowing the conditions causing that code and the running condition that comes with it.Would you like to drive the vehicle some more and report back to me?
i related the problem to my daughter stopping yesterday at a store thats not a tier 5 provider . she only pumped in 5 gls. and drove home approximatly 6 miles. she then drove this morning appr.5 to 6 miles when the issues began, i am thinking this store may have a water problem coupled wit the 10% ethonol,yes if i may drive it tomorrow to help confirm. i will have the codes cleared and see which of them reset if this permissable for the charge i agreed to in the beginning thank you for your prompt responses
No problem at all.I think we have probably identified our issue here, as all the clues are adding up fairly well.Be aware that if you did get 5 gallons of gas that had water in it or other contaminants (diesel, E-85, etc), it will take considerable amounts of diluting to get rid of the roughness permanently. Apart from draining the tank (not the most fun thing to do), you will just need to drive it until you run into roughness again then fill the tank with quality 93 octane fuel. If it is just low quality fuel this will correct it in short order; if it is contaminant based it will take longer. For what it is worth, Mitsubishi strongly recommends 93 octane (or "premium" if you are in a 91 octane area) for this vehicle, and running low octane in combination with low grade/quality gas as well can cause issues easily.Give it some driving and diluting and see how it goes, it sounds like we are going down the right path and will have this wrapped up. Be aware that because you have O2 heater failures the Service Engine Soon light is going to come back on (probably in two engine starts); only replacing the sensors in question will correct that. The P0300 is our main one to watch for. I am suspicious that the P0401 will be resolved at the same time as this code can set during periods of rough running and may not indicate an issue with the EGR system.If you have any questions at all, either now or after some more driving time, just let me know. You can always reach me on this page.IF you feel the need to use one of the lower two negative ratings, please contact me first via the Reply/Continue Conversation link so that I can address your concerns. Again you can always reach me at this page; I am here daily and will respond as soon as I am at work and available.