Jdubgt530 Posted August 20, 2015 Share Posted August 20, 2015 Replaced the computer today, it runs better but misfire code still pops up. Could a bad upstream O2 sensor cause a random misfire that changes or lack of fuel pressure? Link to comment Share on other sites More sharing options...
twisty Posted August 20, 2015 Share Posted August 20, 2015 i wonder if extreme back pressure from a clogged cat could cause random misfires after backing the gasses up and interfering with the exhaust valve process Link to comment Share on other sites More sharing options...
Jdubgt530 Posted August 20, 2015 Author Share Posted August 20, 2015 That's what I was thinking but my back pressure is strong coming out the tail pipe Link to comment Share on other sites More sharing options...
Jdubgt530 Posted August 22, 2015 Author Share Posted August 22, 2015 So I found a thread on another site that a guy was having the same problem as me and his solution was the computer like what I did. Here's the link http://www.subaruoutback.org/forums/66-problems-maintenance/30694-multiple-cylinder-misfire-99-outback.html#/forumsite/20514/topics/30694 Link to comment Share on other sites More sharing options...
Jdubgt530 Posted August 22, 2015 Author Share Posted August 22, 2015 But when I swapped my computer out it didn't fix it Link to comment Share on other sites More sharing options...
wtdash Posted August 26, 2015 Share Posted August 26, 2015 Condition: Plugs? Wires? Coil Pack? 02 Sensor could be involved but would expect a code. The ONLY code is which cylinder Misfire? Td Link to comment Share on other sites More sharing options...
Jdubgt530 Posted August 26, 2015 Author Share Posted August 26, 2015 Plugs are perfect gapped at .040, wires are brand new OEM, coil pack is brand new and checks out perfect, injectors are in perfect order, o2 sensors are working, ignitor is new, new crankshaft and camshaft position sensors. I have done everything that could be causing the problem and even had my local subaru mechanic check it out and they can't fins anything wrong with it. It all leads back to electrical. Oh and compression is perfect. No other codes but a phantom misfire that isn't a true misfire. Â Update: Subaru (Stealership) wanted to keep my car for two weeks just to get 6 hours of labor at $780 to locate the problem. So I got my car back, and probably going to sell it if I cannot figure this shit out Link to comment Share on other sites More sharing options...
DOHCEJ22E1 Posted August 26, 2015 Share Posted August 26, 2015 Plugs should be gapped at .044. Also, keep an open mind that you may have a burnt valve or 2. That is common in these 25D engines. Link to comment Share on other sites More sharing options...
Jdubgt530 Posted August 26, 2015 Author Share Posted August 26, 2015 Brand new valves because they are remanuafactured heads. My subaru mechanic said that .040 is were they should be, plus they are iridium so I shouldn't gap them anyways Link to comment Share on other sites More sharing options...
DOHCEJ22E1 Posted August 27, 2015 Share Posted August 27, 2015 Your Subaru mechanic is wrong. They should be at .044 like every other Japanese 4cyl engine of that time period. Also, Iridium is too much. You should be running platinum NGK's in these heads. Link to comment Share on other sites More sharing options...
Jdubgt530 Posted August 27, 2015 Author Share Posted August 27, 2015 I've ran iridiums in my other friends cars and they have had no problems with it. this problem has been occurring since I bought the car and the guy was running platinums in it when I changed them out to iridium. And I checked the gap and its .044. The plugs are not the problem because if they where then the problem would of been fixed but it's not. Link to comment Share on other sites More sharing options...
twisty Posted August 31, 2015 Share Posted August 31, 2015 i have iridiums in one of my wagons, have been in there for a few years. theres no problem using them, its just a waste of money. i tried copper, platinum and iridiums in that car, there was no difference in performance between the platinums and iridiums. Link to comment Share on other sites More sharing options...
digdug18 Posted September 2, 2015 Share Posted September 2, 2015 back to the problem at hand... what else have you tried? Any other symptoms?  Andrew Link to comment Share on other sites More sharing options...
Jdubgt530 Posted September 2, 2015 Author Share Posted September 2, 2015 At this current moment no I haven't. My local mechanic has helped me narrow it down to electrical. I'm going to be replace my engine wiring harness first to see if that solves it. Link to comment Share on other sites More sharing options...
Jdubgt530 Posted September 11, 2015 Author Share Posted September 11, 2015 Update: talked to a smog guy about the phantom misfire code And said if he recalls right the transmission switches have been known to throw phantom misfire codes in these gts. Checking the switches this weekend and will post about what I find when I do the continuity test Link to comment Share on other sites More sharing options...
bjkroll Posted September 13, 2015 Share Posted September 13, 2015 lol @ "a smog guy". Link to comment Share on other sites More sharing options...
Jdubgt530 Posted September 13, 2015 Author Share Posted September 13, 2015 Lol well it's what he is. I know the correct term is smog tech Link to comment Share on other sites More sharing options...
Zerohour Posted September 13, 2015 Share Posted September 13, 2015 Does you ghost misfire actually incur a misfire? Is this happening on damp days only? Might want to mist water around the engine and look for electrical shorts. We had an ej22 Lego that would randomly misfire. Found out the plug wires/coil were grounding out. And it wouldn't always happen on days when it rained either. Drove me nuts for 4 months! Link to comment Share on other sites More sharing options...
Jdubgt530 Posted September 13, 2015 Author Share Posted September 13, 2015 Conditions do not change the out come. It does it when it is clear and sunny out and on rainy days. It doesn't cause a real misfire. It's phantom because the codes that are being pulled are not actually happening. My Subaru tech even said that it isn't even misfiring, but it's pulling something that is making it determine it as a misfire. What the smog tech said makes perfect sense though, the misfire only happens when the car is under load (in gear racing at 2500-3500rpms) and when it pops up there is no roughness in the engine at all. So I'm going to check all wires leading to the tranny to see if everything is legit in that aspect. Because like I said, it does make sense that it would be causing the misfire because it only happens under load. Link to comment Share on other sites More sharing options...
Jdubgt530 Posted September 27, 2015 Author Share Posted September 27, 2015 *UPDATE* Checked the tranny neutral switch by doing a continuity test on it. Definitely got some results that are troubling. First checked the switch to get continuity at 0 when it neutral, no dice. Just registered as no continuity, infinite amount of ohms. Next was to test it with it in gear. Through it into 2nd, 3rd, and 4th (gears I have noticed the misfire to occur) and it came back with continuity. According to my book it is suppose to be the opposite. When you have it in neutral it should register as continuity and when it is in gear it should register as no continuity or infinite amount of ohms. I don't exactly if this is what is causing my phantom misfire but if the tech that I talked to is right then I may have just solved my misfire problem. Anyone have a clue on whether this could cause my phantom misfire? Link to comment Share on other sites More sharing options...
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