darkwingduck1 Posted May 30, 2015 Share Posted May 30, 2015 The car went in for a tune up , afterwards I started noticing that it ran rough and was getting codes. Finally have it down to one code that pops up repeatedly which is #4 cylinder misfire . I replaced the plugs again , and moved plug wires around and even put a new ignition coil on. Still getting the same code and I am wondering if it might be the injector starting to go bad, I have 259k on this engine and it doesn't use oil or run hot. The car will sometimes go 80 miles or so before the check engine light comes on and other times just a few miles and it comes on . The engine is a 1996 2.5l and has run fine before all this started. Link to comment Share on other sites More sharing options...
shoebee2 Posted May 30, 2015 Share Posted May 30, 2015 whats the code? We're the plugs oil fouled? What did the plug electrode look like? Have you done a compression check? Maybe a vacuum line in the wrong place/not hooked up? Link to comment Share on other sites More sharing options...
darkwingduck1 Posted May 31, 2015 Author Share Posted May 31, 2015 The plugs look great , compression is good on all cylinders, one of the earlier codes said that it was an injector, that is the only thing I haven't tried yet. I have never gotten that code since changing out all the plugs again. Link to comment Share on other sites More sharing options...
darkwingduck1 Posted May 31, 2015 Author Share Posted May 31, 2015 the code is p 0304. Link to comment Share on other sites More sharing options...
wtdash Posted June 1, 2015 Share Posted June 1, 2015 HI, Move or replace that injector, and see what happens. Otherwise, I'd get a leak down test to see how the valves are doing. These 2.5's are due for valve adjustments every 105K miles, so you may be (over) due, and if ignored for too long a valve can get burned (literally). Good luck, TD Link to comment Share on other sites More sharing options...
darkwingduck1 Posted June 2, 2015 Author Share Posted June 2, 2015 thank you , that's the one thing I haven't done, I was going to go ahead and replace the injector since that code came up once, might as well adjust the valves also. Link to comment Share on other sites More sharing options...
Fairtax4me Posted June 3, 2015 Share Posted June 3, 2015 Make sure the injector is plugged in all the way. Sometimes they get unplugged to get a little easier access to the spark plug. Might not be clicked down all the way or there could be crud in the terminals causing a poor connection. Typically misfire problems are spark related but it sounds like you've swapped enough ignition parts to rule that out. Link to comment Share on other sites More sharing options...
matt86 Posted June 3, 2015 Share Posted June 3, 2015 Installing plugs in a EJ25D isn't easy, very tight squeeze. its possible you may have cracked a plug installing them, I know I did when I changed my plugs. Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted June 4, 2015 Share Posted June 4, 2015 what was done on the tune-up and what brand parts were used? Link to comment Share on other sites More sharing options...
darkwingduck1 Posted June 4, 2015 Author Share Posted June 4, 2015 New plugs , new wires they used bosch double platinum plugs and a good wire set, since then I have changed out the plugs twice and am still getting a P0304 code which says it is #4 cylinder misfire, the only thing I haven't done is change out the injector, and I did get a code one time that was listed as an injector, that was several months ago , and now am wondering if the injector is starting to fail. Link to comment Share on other sites More sharing options...
Fairtax4me Posted June 4, 2015 Share Posted June 4, 2015 Were they the single electrode double platinum or double electrode platinum +2 plugs? The +2 double electrode plugs cause issues in these. Link to comment Share on other sites More sharing options...
darkwingduck1 Posted June 6, 2015 Author Share Posted June 6, 2015 No they were the single electrode, and I have changed them out , now I am looking at the fuel injector for number 4 cylinder and when I messed with it yesterday the code came on right away. How hard is it to replace the injector in these engines and is there a difference between OEM and aftermarket injectors Link to comment Share on other sites More sharing options...
idosubaru Posted June 7, 2015 Share Posted June 7, 2015 loosen fuel rail and pop them in and out, pretty easy really. they rarely have issues/fail so i doubt you'll see a statistically meaningful sample size on various options. witchhunter and RC Engineering can pre and post test and rebuild injectors (the former being the cheaper) used is a good option with how rarely they have issues. unsure about aftermarket, given how easy they are to swap and if there's a compelling reason i'd probably try them. Link to comment Share on other sites More sharing options...
idosubaru Posted June 7, 2015 Share Posted June 7, 2015 if wiggling it caused issues- may want to verify it's not hte harness or wiring before messing with the injector? Link to comment Share on other sites More sharing options...
darkwingduck1 Posted June 14, 2015 Author Share Posted June 14, 2015 Good point,I was thinking that perhaps the wiring is in need of being closely looked at,I'm sure these are the original injectors so it would stand that perhaps my wiring has detoritiated. Link to comment Share on other sites More sharing options...
logic23 Posted June 16, 2015 Share Posted June 16, 2015 these injectors dont fail that often.. that would be the last thing i replace. If you can get a whole intake with injectors from a junkyard i would grab that and install. With this you will cover the injector and the wiring. Link to comment Share on other sites More sharing options...
darkwingduck1 Posted June 18, 2015 Author Share Posted June 18, 2015 That is an option I never thought of, I will check around the bone yards and see if I can find one. Link to comment Share on other sites More sharing options...
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