Dufek125 Posted April 30, 2013 Share Posted April 30, 2013 my cars running like absolute shit right now, was running perfectly fine, then it started has a slight random cylinder 4 misfire everyonce in awhile, progressively getting more and more frequent, the other day it started flashing the check engine light constantly and running really rough. babied it home, and checked everything, this happened a while ago and it turned out to be the crank gear slight turned, throwing timing off, got that fixed and it was fine until this started again.. has a new cam sensor, new wires, new plugs, cleaned maf, just redid the timing, just about everything I can think of..theres now no cel but if one does trip its only a #4 cylinder misfire p0304, and it constantly flashes. only thing left is the injector..gonna swap that here and after that im at a loss..any help appreciated! Link to comment Share on other sites More sharing options...
monkeyposeur Posted April 30, 2013 Share Posted April 30, 2013 Coil pack? Check resistance across primary and secondary coils. Also check resistance of injectors before you replace it. You can move it and see if the misfire follows. Link to comment Share on other sites More sharing options...
drew1531 Posted April 30, 2013 Share Posted April 30, 2013 Rarely happens, but maybe a vaule guide may have dropped??? Just putting it out there. Maybe try a pressure test on your vaules? I know I have seen 06 impreza sport have 2 vaule guides drop on the side where the cat. converter is. The heat from the converter causes the head to get hot. Prolly not the issue but never know. Link to comment Share on other sites More sharing options...
Dufek125 Posted April 30, 2013 Author Share Posted April 30, 2013 I'm thinkjng a car test is next, any maybe recheck timing I guess..I don't know..its not throwing any codes so I can't even really say its missing anymore. It was throwing a #4 misfire when it was driving but no when its just parked and running. Like I said last time it did this it was timing so I just reset it all and it all seemed great, I'm just at a loss on what to do from here..no cel so it doesn't seem electrical. Its jlgetting good fuel so it doesn't seem fuel related and the timing should be dead on..idk.. Link to comment Share on other sites More sharing options...
Dufek125 Posted April 30, 2013 Author Share Posted April 30, 2013 Brand new msd coil pack. And yes its wired correctly and putting out good spark. New 02 sensors, swapping out crank and can sensors again tomorrow with known good ones. I'm just at a loss..none of it makes sense to me.. Link to comment Share on other sites More sharing options...
Dufek125 Posted May 1, 2013 Author Share Posted May 1, 2013 Bump! Need some help guys! Link to comment Share on other sites More sharing options...
08SpecB_DE Posted May 1, 2013 Share Posted May 1, 2013 Check the plug gap on #4. Did you try swapping the wires around to see if the misfire changes cylinder? You said it seems to be getting good fuel but did you move injectors around? Link to comment Share on other sites More sharing options...
monkeyposeur Posted May 1, 2013 Share Posted May 1, 2013 Did you check the injectors? Have you tried moving the plug wires and/or injector to see if the misfire follows? Is this on a stock engine? I thought you were doing a turbo swap? Link to comment Share on other sites More sharing options...
Tr00b Posted May 1, 2013 Share Posted May 1, 2013 Is the injector plugged in all the way? This is what happened to me almost exactly. Try unplug and clean injector connectors with MAF cleaner and plug in securely. Link to comment Share on other sites More sharing options...
Dufek125 Posted May 1, 2013 Author Share Posted May 1, 2013 stock ej25d, turbo build is still outta the car lol. injector is plugged in all the way, plugs are only a month old iridiums I find it hard to believe they could have gone bad already but maybe.. month old 8mm wires too, swapped injectors from a different set and no difference, there all plugged in too. Link to comment Share on other sites More sharing options...
Zues Marine Posted May 1, 2013 Share Posted May 1, 2013 swap wires back to the 7mm if you have them, see if that changes anything Link to comment Share on other sites More sharing options...
Dufek125 Posted May 1, 2013 Author Share Posted May 1, 2013 and the cel isnt on so I cant even say its a misfire really. Link to comment Share on other sites More sharing options...
Dufek125 Posted May 1, 2013 Author Share Posted May 1, 2013 i did, nothing..my number 2&4 plugs were pretty black tho, regapped everything to .040 and still no luck..it seems like timing but I just redid it and I know its on.. Link to comment Share on other sites More sharing options...
johnegg Posted May 1, 2013 Share Posted May 1, 2013 how many ft lbs did you torque the crank bolt? did you replace the tensiner on the t-belt. pull the cam covers and check the timing . Link to comment Share on other sites More sharing options...
Sludgeroo Posted May 1, 2013 Share Posted May 1, 2013 This happened to me; make sure the 4th spark plug doesn't have the o ring from the socket stuck on it. The boot (depending on the size of o ring) can plug in enough to have a good connection, but eventually get backed out. The thing that's crazy is its really hard to tell if its in there, esp. the DOHC motors. Not common but it did happen to me. Link to comment Share on other sites More sharing options...
Dufek125 Posted May 2, 2013 Author Share Posted May 2, 2013 Just redid timing again. Spot on. New wires. New set of plugs. Found 1 vacuum leak and fixed it. No difference. Torqued it to 140 ft lbs like it says too. I'm at such a loss right now. It runs but its really rough. Like its on 3 cylinders, and idles really crappy too. Link to comment Share on other sites More sharing options...
98BLGT Posted May 2, 2013 Share Posted May 2, 2013 Check if your coolant overflow fills up when it's running. Had the exact same rough idle on a new set of head gaskets and it was leaking coolant into the cylinders. Link to comment Share on other sites More sharing options...
Dufek125 Posted May 2, 2013 Author Share Posted May 2, 2013 Just did heagaskets..and it hasn't been leaking or overheating. It better not be..lol. Link to comment Share on other sites More sharing options...
98BLGT Posted May 2, 2013 Share Posted May 2, 2013 Yeah we got the cheaper head gaskets and it lead right from the start. Link to comment Share on other sites More sharing options...
Dufek125 Posted May 5, 2013 Author Share Posted May 5, 2013 o2 sensor? I put in a new bosch one like a month ago when all my other problems started. could it be bad already? thinking oem is probably the way to go this next time.. Link to comment Share on other sites More sharing options...
pleaidestar Posted May 5, 2013 Share Posted May 5, 2013 o2 sensor? I put in a new bosch one like a month ago when all my other problems started. could it be bad already? thinking oem is probably the way to go this next time.. Can't go wrong with oem, ntk o2 sensors are probably the next best thing, you can get those from rock auto pretty cheap. Link to comment Share on other sites More sharing options...
snederhiser Posted May 6, 2013 Share Posted May 6, 2013 Hello; Did you check the TR module? This fires the coil. Check valve clearance? Put a test light on the injector connector and see if it is firing. Check the resistance on the injector. Should be 11 ohms. Just fixed a car that had faulty wiring on the injector circuit, Steven. Link to comment Share on other sites More sharing options...
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