Joenasnj Posted September 16, 2007 Share Posted September 16, 2007 I have a 1997 legacy gt sedan with the 2.5. I have replace the head gasket already. The motor has been running rough before i fixed the head gasket. engine codes of misfire # 4 cylinder and sometimes #2 misfire.Codes have shown up and low and high RPMs. I have put new plug wires and plugs in it. Check the vac lines and they seem ok. Also installed a new pvc valve and cleaned the tubes. It seems to run good at higher speeds. I have also failed inspections due to sensors coming up not ready when DMV hooks up to the the cars computer. Any help on what causes the problem or do i need to take it to the dealer? thanks Joe Link to comment Share on other sites More sharing options...
nipper Posted September 16, 2007 Share Posted September 16, 2007 Subaru wires and proper spark plugs? Spray the engine with a water bottle while its running, in the evening. Look for stray voltages (blue sparks) especially around the coil towers. The next possability is a leaking injector. Right now I think its going to be a coil issue. What was done when the HG was replaced. nipper Link to comment Share on other sites More sharing options...
Joenasnj Posted September 17, 2007 Author Share Posted September 17, 2007 I put new wires,plugs,water pump,timing belt,belts and hose on the rad. Could it be a bad coil? It did it before i did all of the work. thanks Joe Link to comment Share on other sites More sharing options...
nipper Posted September 17, 2007 Share Posted September 17, 2007 Have the codes pulled, and let us know what it says. Failing inspection can be that you went for inspection too soon after having the battery disconnected. It takes a specific number of cycles for the test to be valid. There are a few things it can be, but i really dont want to have you start throwing more parts at it without us first looking at the codes. nipper Link to comment Share on other sites More sharing options...
xrturbo Posted September 18, 2007 Share Posted September 18, 2007 Are you 100% sure you put all of the buckets (lifters) back in the exact location they came from? Link to comment Share on other sites More sharing options...
porcupine73 Posted September 18, 2007 Share Posted September 18, 2007 If you specifically got #2 and #4 misfire codes, which I think would be P0302 and P0304, then maybe try NGK spark plugs with OEM spark plug wires (not plug wires from an auto parts store). I have also failed inspections due to sensors coming up not ready when DMV hooks up to the the cars computer.Yes, these are probably the emissions/inspection monitors. There are about 7 of these systems. The longest to set seems to be the evap system. It can take a number of trips over a number of miles to get them all to set to 'ready'. When you get or clear a CEL/MIL or disconnect the battery, the monitors all go back to not ready. There's some info on endwrench.com about it. If you have a reasonable scan tool, it will tell you the status of each I/M. Also if the CEL/MIL is presently on you will probably not pass inspection either, at least that's how it is in NY. Link to comment Share on other sites More sharing options...
Dickensheets Posted September 18, 2007 Share Posted September 18, 2007 Does it run rough when cold or after it warms, or both? If it runs rough when warm but ok when cold, start looking at sensors. If rough even when cold I would look at plugs/wires. Link to comment Share on other sites More sharing options...
Joenasnj Posted September 19, 2007 Author Share Posted September 19, 2007 Nipper I tied your water test and no problem. I'm getting PO304 code all the time and some times PO302. I spayed carb cleaner around all the gaskets to check for leaks all clear on that. Dickensheets Happens warm and cold xrturbo Yes i did the guy at DMV said the same that i have to drive it for a few to reset those codes. thanks again Joe Link to comment Share on other sites More sharing options...
idosubaru Posted September 19, 2007 Share Posted September 19, 2007 what plugs and wires did you use? if you didn't use NGK plugs and Subaru (or Magnecor) ignition wires, then that could very easily be your problem. EJ motors are freaks, do not use aftermarket wires on them. i've seen brand new wires right off the shelf cause misfire codes on EJ motors. installing Subaru or Magnecor wires is the solution. make sure all the wires are seated properly. and find an ignition coil to swap out. it's easy, only takes a couple minutes and you can easily find used ignition coils for sale for not much money. get one and swap it out. Link to comment Share on other sites More sharing options...
WAWalker Posted September 19, 2007 Share Posted September 19, 2007 If it you can feel the misfire while the engine is idling, but seems to run good off idle, you probably have tight vavles. Did you check valve clearance after reassembing the engine? Link to comment Share on other sites More sharing options...
frag Posted September 19, 2007 Share Posted September 19, 2007 I was tinking valves also. Did you have a very close look at the valves when you replaced the gaskets? Maybe you should do a compression check to see if the roughness is not caused by compression differences between the cylinders. Link to comment Share on other sites More sharing options...
Joenasnj Posted September 19, 2007 Author Share Posted September 19, 2007 I'm going to try the factory wires and nkg plugs this week end and see if that is it. Might pick up a used coil and the bone yard too thanks Link to comment Share on other sites More sharing options...
Joenasnj Posted September 20, 2007 Author Share Posted September 20, 2007 I was tinking valves also. Did you have a very close look at the valves when you replaced the gaskets? Maybe you should do a compression check to see if the roughness is not caused by compression differences between the cylinders. Heads where rebuilt by a machine shop Link to comment Share on other sites More sharing options...
WAWalker Posted September 20, 2007 Share Posted September 20, 2007 Heads where rebuilt by a machine shop Believe it or not valve adjustment changes after torquing the cylinder heads. And even some machine shop can't, won't, or don't set vlave lash on these heads after working on them. Might want to double check. Link to comment Share on other sites More sharing options...
Joenasnj Posted September 28, 2007 Author Share Posted September 28, 2007 Ok, I have installed NGK plugs and factory wires and now the problem is worse constant P0302 and P0304. I guessing it must be the coil. I did have the same problem before motor was rebuilt. Any other suggestions. As for the cam adjustment the cams are installed after the heads are installed and i followed the recommendations of my local Subaru dealer. thanks again Link to comment Share on other sites More sharing options...
nipper Posted September 28, 2007 Share Posted September 28, 2007 Ok, I did have the same problem before motor was rebuilt. thanks again Same coil and same crankshaft position sensor? nipper Link to comment Share on other sites More sharing options...
Joenasnj Posted September 29, 2007 Author Share Posted September 29, 2007 Same coil and same crankshaft position sensor? nipper Yes Link to comment Share on other sites More sharing options...
nipper Posted September 29, 2007 Share Posted September 29, 2007 Thats where i would look first. Without an oscilloscope i cant tell you which, but my gut says coil (keeping in mind my gut was just ripped open so it may be out of cal :-p ) nipper Link to comment Share on other sites More sharing options...
Joenasnj Posted September 29, 2007 Author Share Posted September 29, 2007 Thats where i would look first. Without an oscilloscope i cant tell you which, but my gut says coil (keeping in mind my gut was just ripped open so it may be out of cal :-p ) nipper I'll pick up a new coil tomorrow at the dealer(yes they are cheaper than Auto store) and see if that is it. thanks again Joe Link to comment Share on other sites More sharing options...
Joenasnj Posted October 10, 2007 Author Share Posted October 10, 2007 Been awhile but finally installed a new coil from the dealer and still have a rough idle and PO304 code. So far the code is only coming up at idle. Any more help would be appreciated. thanks Joe Link to comment Share on other sites More sharing options...
nipper Posted October 10, 2007 Share Posted October 10, 2007 Been awhile but finally installed a new coil from the dealer and still have a rough idle and PO304 code. So far the code is only coming up at idle. Any more help would be appreciated. thanks Joe SO there was some improvement. Are we sure the timing belt is on properly. Next to look at it would be vacumme leaks. Is the missfire roving or all the time? nipper Link to comment Share on other sites More sharing options...
WAWalker Posted October 11, 2007 Share Posted October 11, 2007 As for the cam adjustment the cams are installed after the heads are installed and i followed the recommendations of my local Subaru dealer. thanks again What do you mean exactly by this statement? You set the valve lash at .008 intake and .010 exhaust? Link to comment Share on other sites More sharing options...
Joenasnj Posted October 12, 2007 Author Share Posted October 12, 2007 SO there was some improvement. Are we sure the timing belt is on properly. Next to look at it would be vacumme leaks. Is the missfire roving or all the time? nipper Seems like every time i'm stopped and in gear. Link to comment Share on other sites More sharing options...
Joenasnj Posted October 12, 2007 Author Share Posted October 12, 2007 What do you mean exactly by this statement? You set the valve lash at .008 intake and .010 exhaust? All the valve lash's where at the specs the dealer told me. I do believe those number sound about right Link to comment Share on other sites More sharing options...
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