ivantruckman Posted April 3, 2015 Share Posted April 3, 2015 Hi Guys , my 86 gl ea82 stock Hitachi carb is backfiring between shifts , I just put a carb kit in , it runs and idles flawlessly , adjusted the timing and the sputtering between shifts stopped . but when I accelerate sharply and then put the clutch in it takes about 2 seconds and backfires like a shot gun , it exploded the muffler. it backfired before and after the carb kit.. no change.. I don't want to put a new muffler on till I get it to stop. so I cant drive it on the road....anny one else ever have this happen ? Link to comment Share on other sites More sharing options...
jono Posted April 3, 2015 Share Posted April 3, 2015 wasn't there some sort of anti backfire set up on a lot of our Subarus ? Like a reed valve air feed on backing off throttle position ? Extra complexity of hoses and a valve that looks a bit the shap of a sand timer ..... Link to comment Share on other sites More sharing options...
l75eya Posted April 3, 2015 Share Posted April 3, 2015 Check out the first two photos I have posted in a thread I made when I was having a little trouble converting my car to a weber carburettor. http://www.ultimatesubaru.org/forum/topic/146444-its-inevitablemy-weber-questions/ Those two black things, on your car, are they connected to the air box? I was having massive backfiring issues when letting my foot off the gas in my car both before and after I put the weber on.There's this thing around these message boards called the quarter trick. You take a quarter, or a nickle, whatever you can get to fit there right, and shove it in to the hose to block it. (For instance, that second picture I have, of the one on the pass. side, you can see the hose open towards the bottom of the pic. I took that end of the hose off the ASV, put the quarter in there, and then put the hose back on. No more backfiring. Link to comment Share on other sites More sharing options...
ducunee Posted April 3, 2015 Share Posted April 3, 2015 Anti back fire valve fixed mine. available at ultimate subaru parts store Link to comment Share on other sites More sharing options...
TomRhere Posted April 3, 2015 Share Posted April 3, 2015 Yea, what Jono said. I can't remember all of what Skip said from many years ago, when one of the BRAT's were doing that. But it has to do with air intering the exhaust system. Either the Anti-Afterburn-Valve, (AAV), or the Air-Suction-Valve, (ASV), system(s) are the most likely culprit(s). I blocked it all off, then promptly removed all that MABS when I swapped to a Weber carb. MABS = Miscelanious Assorted Bull S**T Link to comment Share on other sites More sharing options...
ivantruckman Posted April 6, 2015 Author Share Posted April 6, 2015 ILL TRY THIS TODAY , LOOKS EASY ENOUGH , THANKS GUYS. Link to comment Share on other sites More sharing options...
ivantruckman Posted April 13, 2015 Author Share Posted April 13, 2015 I deleted all the air valves , blocked off the exhaust ports , plugged the air cleaner ports. works perfectly . no backfire issues at all .. thanks tom .duncanee, i75eya,jono. you guys rock . 2 Link to comment Share on other sites More sharing options...
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