BigBlack-V Posted November 30, 2012 Share Posted November 30, 2012 So its been over a month since my new/ re-tune and I have come to the conclusion that I never had bad O-ring gaskets. It turns out when my car was originally tuned the MAF scaling was never changed to fit my Cobb SF intake. Cobb stated that the scaling did not need to be changed for the Cobb parameters/maps however they were wrong. The car would stumble and almost stall in colder weather when i came to a stop and this was due the MAF scaling. After the new tuner tuned it I have not had this issue since. NOTE: If you have an intake and your car has an AP OTS Map or Protune please have your tuner look at your MAF scaling before you assume it is the problem in the OP. I was 0. And I'm still a zero. Link to comment Share on other sites More sharing options...
gessvt Posted November 30, 2012 Share Posted November 30, 2012 (edited) '05 gaskets are orange silicone/rubber as well. Edited November 30, 2012 by gessvt Link to comment Share on other sites More sharing options...
doobaruGT Posted December 6, 2012 Share Posted December 6, 2012 Changing these this weekend and wondering if I can really get away with this DIY without removing the fuel lines...gonna give it a whirl! Updated parts list since original part-out here. Original Full part-out of my LGT HERE! Link to comment Share on other sites More sharing options...
I Donated Too luchadorjose Posted December 6, 2012 I Donated Too Share Posted December 6, 2012 Wow this DIY is exactly what this community is all about, thank you BMX045 for the awesome write-up! You should post more of these kinds of things, thank you for contributing Link to comment Share on other sites More sharing options...
doobaruGT Posted December 9, 2012 Share Posted December 9, 2012 Did this today and its one of the smoothest maintenance items to date. Updated parts list since original part-out here. Original Full part-out of my LGT HERE! Link to comment Share on other sites More sharing options...
_MFB_ Posted December 14, 2012 Share Posted December 14, 2012 Are the wrx 08 up , forester 09 up affected by this ? we have the same intake manifold. I show the symptoms on cold start up as well. Link to comment Share on other sites More sharing options...
ripemeat Posted December 14, 2012 Share Posted December 14, 2012 more than likely they have the same issue.... Link to comment Share on other sites More sharing options...
BigBlack-V Posted January 17, 2013 Share Posted January 17, 2013 I got my car back from the dealer and on the invoice it was confirmed there was dampness around the upper intake gasket. Another 08 rough idle issue confirmed and fixed. Thank you Chris !!! I was 0. And I'm still a zero. Link to comment Share on other sites More sharing options...
xt2005bonbon Posted January 19, 2013 Share Posted January 19, 2013 Wow this DIY is exactly what this community is all about, thank you BMX045 for the awesome write-up! You should post more of these kinds of things, thank you for contributing Yes, thank you bmx045 for all your contributions and great insights on this site. Too bad you're banned . Link to comment Share on other sites More sharing options...
xt2005bonbon Posted January 19, 2013 Share Posted January 19, 2013 i have the very same issue with random misfire on #4 did everything to resolve the issue. only occurs when the car is cold -- i just replaced the intake manifold gaskets myself -however the cel was still on. something to look at too is the injectors and the gaskets that go on them. they also expand and contract depended on weather. i bought new gaskets from friedbean and the check engine light has not come on since. knock on wood. it wouldnt hurt to use seafoam - works wonders. good luck How is everything holding up so far? Link to comment Share on other sites More sharing options...
Brunex Posted January 22, 2013 Share Posted January 22, 2013 My 05 does have the rough idle when I first start it in the morning, but the thing is I live in south florida so the cold weather is not the issue here. But every time I start my car in the morning it idles rough, together with engine movement and the CEL reading random/general misfire. The rough idle is gone when I start it when the engine is already warm. The problem is with the cold engine. I can try doing this DIY cuz the parts are cheap, it is just labor intensive. Oh and my car was supposedly protune by the previous owner. Link to comment Share on other sites More sharing options...
fysics Posted January 23, 2013 Share Posted January 23, 2013 would seem to me it's definitely possible to be the same issue even with warmer temps. if the o-rings aren't making the best seal when cold and then expand and create a better seal at temp then the rough idle goes away. Link to comment Share on other sites More sharing options...
xt2005bonbon Posted January 23, 2013 Share Posted January 23, 2013 and the CEL reading random/general misfire. Exactly which codes did you get? like P0301, P0302, P0303, and/or P0304? Link to comment Share on other sites More sharing options...
Brunex Posted January 23, 2013 Share Posted January 23, 2013 the mysterious one, P0000 Link to comment Share on other sites More sharing options...
xt2005bonbon Posted January 23, 2013 Share Posted January 23, 2013 interesting.. Link to comment Share on other sites More sharing options...
bearshadow Posted January 23, 2013 Share Posted January 23, 2013 vous pouvez voir la meme chose en francais au/you can see this in french at http://www.clubsubaru3r.com/viewtopic.php?f=25&t=3761&p=33351#p33351 Basically the problem is when it's cold outside like 0f and under when you start the car it run fine and even if you let it idle for like 5 min it's fine, but when you hit the gaz 1 time the choke stop and now the car will almost die down to 500 rpm then back up to 1500 down to 500...every time you stop at a corner or you put on neutral then when the car is hot (15 min highway) the problem is gone.(how to be a good customer video ETCG! [ame=http://www.youtube.com/watch?v=wWUqr-mKCx0]How To Be a Good Customer -ETCG1 - YouTube[/ame] The problem i found (using eric video on vaccum leak using carb cleaner [ame=http://www.youtube.com/watch?v=9CPqbaSgcok]How To Find A Vacuum Leak - EricTheCarGuy - YouTube[/ame] is that between the plastic intake (pic below) and the metal intake when the metal is cold it contracted and the gasket didn't fill the gap it's a manufacture error on the gasket and it's only on late 2007 and early 2008 wrx and legagy gt model. i did this a week ago on my wrx 2008, the rough idle is completetly gone and i can actually reach my target boost now (14.5) took me like 3-4 hour with a couple of beer.you will NEED dental pick and a small mirror something like that here what i did with picture :popcorn: http://s12.postimage.org/vicly0865/blue_orange.jpg (this picture isn't mine) yellow arrow and circle are bolt or clam to remove,the orange circle is an air pump to be remove too (2 bolts, 1 clam), the orange arrow is the fuel line bracket that will need to be bent up, the blue arrow are optional but it help move the intake a bit start by removing the intercooler, the air intake and the tube between the air box/motor and the small black coolant tank (unhook the three tube on top and remove the bolt holding the tank, lift the tank off the plastic nipple and drain the liquid inside into a CLEAN bottle you will reuse that). http://s12.postimage.org/ado5j39st/b_braket.jpg behind the intake when the intercoller used to be you will need to remove 3 bolts, if you look at the engine from the front start on your left (the last bolt is hidden behind the bov tube), they hold a bracket for electric wire,now you will need to ply this off the intake on the picture you can see how the bracket look. ok so now we need to access the plastic intake gasket http://s12.postimage.org/p5xgo653x/bmanifold.jpg there's 6 bolts holding down the intake THESE ARE TO BE TORQUED BACK AT 6 when you reinstall when your done you should be able to lift the intake... well maybe not lift as much as gap it http://s12.postimage.org/ygemotm59/bratchetspace.jpg http://s12.postimage.org/n6c9j0lel/bgap.jpg http://s12.postimage.org/6iuerdmcd/bspace_2.jpg you can use something to hold the intake up like this IF YOU DO, PLEASE ONLY DO THAT BETWEEN THE TWO INTAKE, IF YOU SCRATCH THE HEAD WHERE THE GASKET SEAL YOU'LL CRY this is what we're looking for http://s12.postimage.org/obax24x99/bgasket_1.jpg http://s12.postimage.org/4j8r2ulp9/bgasket_2.jpg the one on the left is the old gasket it's a lot harder material and it's about 1/3 the height of the new one. Try not to drop anything inside the intake, take you time and this is where if you don't have dental pick you will lose your temper trying to get the old one out. The two on the passager side are kinda easy to do , make sure when you install the new one that they are completely seated, it's not from the same car but it's like this (yours are round not oval) http://s20.postimage.org/h7y9gv7e5/ez3020and20ez30r20intakes5.jpg now for the fun part, the driver side... basically the problem is that you have about the height of the gasket to work with. if you try to lift the intake you'll soon discover that the fuel line past over it and 1/4 over it to be precise I used a long screwdriver and kinda jam it in. you can see it on the left http://s12.postimage.org/6iuerdmcd/bspace_2.jpg what i did on that side it (and do this slowly) is remove the old one and 1 by 1 you simply put the gasket on the bottom piece (thumber) and slowly lower the intake on it, now wiggle the intake with very little pressure on it and the gasket will seat in. CONFIRM THAT EVERY GASKET IS COMPLETELY SEATED WITH A MIRROR DON'T SKIP THIS PART YOU CAN HAVE TWISTED THE GASKET WHEN YOU INSTALL IT Torque back the intake at 6, reinstall everything, fill back the coolant tank with the coolant. start the car and check for leak, you will see steam from the antifreeze that drip on the motor but it normal and your done. (sr if there's a couple of fault, i usually speak french lol) Link to comment Share on other sites More sharing options...
awwrxwgn Posted January 25, 2013 Share Posted January 25, 2013 will be calling my dealer about this, I believe I have this problem as my dash lit up like an xmas tree with p0300 and p0117 code. Link to comment Share on other sites More sharing options...
fysics Posted January 28, 2013 Share Posted January 28, 2013 have mine in the shop today to look at this... though they want to check out the plugs and coil pack and all that. it seems to be a known issue but you have to talk to the right people who will listen, I can't imagine they like a customer coming in saying 'I know what the problem is, fix that!'. will report back. Link to comment Share on other sites More sharing options...
xt2005bonbon Posted January 28, 2013 Share Posted January 28, 2013 I can't imagine they like a customer coming in saying 'I know what the problem is, fix that!'. will report back. Link to comment Share on other sites More sharing options...
BigBlack-V Posted January 28, 2013 Share Posted January 28, 2013 have mine in the shop today to look at this... though they want to check out the plugs and coil pack and all that. it seems to be a known issue but you have to talk to the right people who will listen, I can't imagine they like a customer coming in saying 'I know what the problem is, fix that!'. will report back. thats what I did and it seemed to work Best of luck with it Jon I really dont hope they charge you or give you a hard time about the issue I was 0. And I'm still a zero. Link to comment Share on other sites More sharing options...
fysics Posted January 28, 2013 Share Posted January 28, 2013 thats what I did and it seemed to work Best of luck with it Jon I really dont hope they charge you or give you a hard time about the issue thanks Jay, yea I hope it's quick and painless. meanwhile I get to drive around in a '12 impreza. so there's that lol. Link to comment Share on other sites More sharing options...
xt2005bonbon Posted January 28, 2013 Share Posted January 28, 2013 meanwhile I get to drive around in a '12 impreza. so there's that lol. NA or turboed? Link to comment Share on other sites More sharing options...
fysics Posted January 28, 2013 Share Posted January 28, 2013 NA or turboed? pretty sure it's a 2.0i premium, so NA. Link to comment Share on other sites More sharing options...
xt2005bonbon Posted January 28, 2013 Share Posted January 28, 2013 pretty sure it's a 2.0i premium, so NA. . Link to comment Share on other sites More sharing options...
BigBlack-V Posted January 28, 2013 Share Posted January 28, 2013 pretty sure it's a 2.0i premium, so NA. knowing how you drive thats all i would give you if i was a dealer I was 0. And I'm still a zero. Link to comment Share on other sites More sharing options...
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