xt2005bonbon Posted February 25, 2019 Share Posted February 25, 2019 I'm going to try to pull a lv the ones I pulled already is blank because I reset the ecm. I have noticed that when engine is cold it misfires way more than when it's warm. Is this normal if the valves need adjusted? Ah you know, the theory says the following: let's suppose an exhaust valve has little to no clearance. When the engine is cold, it should not exhibit too many misfires. And then, as the engine warms up the misfires counts or likelihood should increase. That is because the valve stem expands with heat, thereby decreasing clearance even more. This results in a valve which cannot fully close. You then decrease compression and increases misfire likelihood. Having said that, my 06 had more misfires during cold idle and almost gone at warm idle. I swore it was rings (cause I checked everything else at that time except valve clearance). Long story short, it was actually due to a tight exhaust valve. So go figure It's now been 25k after I readjusted the clearances and she's running great. If that is indeed the issue and you catch it 'early', then you may be safe from a burnt valve. Link to comment Share on other sites More sharing options...
GrizzlyBear Posted February 25, 2019 Author Share Posted February 25, 2019 Here are 3 more logs with engine coldBtSsm_20190225_133635.csvBtSsm_20190225_133932.csvBtSsm_20190225_134031.csv Link to comment Share on other sites More sharing options...
GrizzlyBear Posted February 25, 2019 Author Share Posted February 25, 2019 Great car only has 88k on it. Can my logs or lv's show valve clearance problems? Link to comment Share on other sites More sharing options...
xt2005bonbon Posted February 25, 2019 Share Posted February 25, 2019 Not really. You have to measure it. Link to comment Share on other sites More sharing options...
xt2005bonbon Posted February 25, 2019 Share Posted February 25, 2019 My 06 had 120k when she had this issue. Our 05 also had that issue. She had 73k. side note: noticing your TGV voltages are slightly different. I never really paid close attention to these parameters. So not sure if that is OK. Other may chime in on that one. Link to comment Share on other sites More sharing options...
GrizzlyBear Posted February 25, 2019 Author Share Posted February 25, 2019 Can you get lv's if the check engine light is on? Because I'm not seeing any timing valuse Link to comment Share on other sites More sharing options...
xt2005bonbon Posted February 25, 2019 Share Posted February 25, 2019 How many miles do you think you put on the car since you reset the ECU? I am not really after the (pulled) timing values from the LV table. More after the LTFTs. And yeah, you can log/pull lvs even if the CEL is on. I know from experience Link to comment Share on other sites More sharing options...
GrizzlyBear Posted February 25, 2019 Author Share Posted February 25, 2019 Here are the lv's I've gotten so far. I've driven about 6 miles or so and lots of idling and still no timing values. Why is this? Link to comment Share on other sites More sharing options...
xt2005bonbon Posted February 25, 2019 Share Posted February 25, 2019 When you pull an LV, you want the 'Learn %' values to be close to 0%. That means the ECU does not have to correct too much the fuel delivery. This implies (in general) that you do not have any vacuum leaks. As for the timing correction, you also want zeros everywhere. That means the ECU does not need to pull timing because it is not hearing knock. So that is a good thing to have zeros everywhere as well. You have not driven enough to really populate the four Learn % fields. Although they usually update pretty quickly. In any case, so far everything looks good there. Link to comment Share on other sites More sharing options...
GrizzlyBear Posted February 25, 2019 Author Share Posted February 25, 2019 How far do I need to drive for them to show up? Also I noticed my boost only hit like 11.3 under a full pull is that stock? Thought it was closer to 13ish? Link to comment Share on other sites More sharing options...
xt2005bonbon Posted February 25, 2019 Share Posted February 25, 2019 ~13.5 psi should be the max target boost. Keep in mind intake temps may affect actual max boost level. In colder temp, it is easier to overboost a bit. I don't know how 'far' you need to drive. It all depends. You just want to make sure that when you drive, you include all driving conditions (idling, accelerating, cruising, a bit of wot). Link to comment Share on other sites More sharing options...
GrizzlyBear Posted February 25, 2019 Author Share Posted February 25, 2019 Ok I'll have to go for a longer cruise. So is 11.5 psi boost normal or is it to low? It's about 45deg. Out and engine was at operating temp. Link to comment Share on other sites More sharing options...
xt2005bonbon Posted February 25, 2019 Share Posted February 25, 2019 It is a bit low I'd say. It also depends how long you were under load during your wot session. Personally, I think it is time to check the valve clearances for real. You can do it with the engine in place. Can't remember. did you do a compression/leakdown test? Link to comment Share on other sites More sharing options...
GrizzlyBear Posted February 25, 2019 Author Share Posted February 25, 2019 I did a compression test on all the cyli fees and if I remember right they were all 65psi +- 2psi. Also scoped every cylinder through the spark plug hole and all the cylinder walls looked fine and all pistons looked good. #2 piston had a little more carbon around where the spark plug sits but no damage. Guessing the extra carbon or just blackining is due to the misfires. This misfire just showed up about 4 months ago and I don't drive but maybe a hundred miles a week tops. Link to comment Share on other sites More sharing options...
GrizzlyBear Posted February 25, 2019 Author Share Posted February 25, 2019 Oh and was a full pull through 1st,2nd,and 3rd. And the most boost recorded was 11.5. Link to comment Share on other sites More sharing options...
GrizzlyBear Posted February 25, 2019 Author Share Posted February 25, 2019 Oh and if say #2 exhaust valve is to tight cause it wouldn't be to loose and cause a misfire plus the valves would be louder. How much damage could I realistically do if I had to wait a month or so to replace it? I know it could burn a valve but is that a real possibility with as little as I drive and just babying the car? Also is there an easy way to check if I have a burnt valve already? Link to comment Share on other sites More sharing options...
xt2005bonbon Posted February 25, 2019 Share Posted February 25, 2019 I actually drove for a while with my misfire issues. Maybe 5K? Not smart but that's what I did anyway. But YMMV. The only way I can think of to check for a burnt valve is using a high quality borescope that could somehow 'look behind' once it has entered the combustion chamber. Link to comment Share on other sites More sharing options...
GrizzlyBear Posted February 25, 2019 Author Share Posted February 25, 2019 I'm searching for the correct valve lash but finding different measurements. Do you know the correct valve lash I need to be looking for? Link to comment Share on other sites More sharing options...
xt2005bonbon Posted February 26, 2019 Share Posted February 26, 2019 Yes. Look at my thread here: https://legacygt.com/forums/showthread.php/my-turn-adjust-valve-clearances-242071.html Link to comment Share on other sites More sharing options...
GrizzlyBear Posted February 26, 2019 Author Share Posted February 26, 2019 Ok cool thx. I'm picking up the vc gaskets in the morning and will be measuring the clearance tomorrow. If I need to buy new valve cups do you know the best/cheapest place to buy them? Link to comment Share on other sites More sharing options...
xt2005bonbon Posted February 26, 2019 Share Posted February 26, 2019 Heuberger Subaru last I checked. They have a website for parts. Google it. Link to comment Share on other sites More sharing options...
GrizzlyBear Posted February 26, 2019 Author Share Posted February 26, 2019 Here is a lv after a hour or more drive. And a first start of the morning log. Just started the car and drove for about 5 min in the log.BtSsm_20190226_082237_knock.csv Link to comment Share on other sites More sharing options...
xt2005bonbon Posted February 26, 2019 Share Posted February 26, 2019 Everything appears OK except the misfires in #2. Looking forwards to see your valve clearance specs. Link to comment Share on other sites More sharing options...
GrizzlyBear Posted February 27, 2019 Author Share Posted February 27, 2019 ok here are the valve measurementssubaru valve lash.pdf Link to comment Share on other sites More sharing options...
GrizzlyBear Posted February 27, 2019 Author Share Posted February 27, 2019 I know cyl 2 both exhaust need replaced. but what do you think about everything else? Link to comment Share on other sites More sharing options...
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