RubySuby Posted October 4, 2003 Share Posted October 4, 2003 what cause back firing.. i got a 2 inch header's to a cat then from there a 2 inch all the way back to a chrome cannon. it happen's when changing gear's when letting the foot out and then pushing your foot in the cluch it goes pop pop.?? Any help would be greatfull clint. Quote Link to comment Share on other sites More sharing options...
TomRhere Posted October 4, 2003 Share Posted October 4, 2003 Kinda sounds like what mine was doing when I installed the duals. Do you still have the ASV system hooked up? If so, you need to pull the hoses off of the breather can, and plug them. Or, just remove the system, period. Couldn't figure that one out myself, had to ask here on the board...... Quote Link to comment Share on other sites More sharing options...
RubySuby Posted October 4, 2003 Author Share Posted October 4, 2003 Originally posted by TomRhere Kinda sounds like what mine was doing when I installed the duals. Do you still have the ASV system hooked up? If so, you need to pull the hoses off of the breather can, and plug them. Or, just remove the system, period. Couldn't figure that one out myself, had to ask here on the board...... Asv system is that the polloution system? whats the breater can? what you mean plug them block them? clint. Quote Link to comment Share on other sites More sharing options...
TomRhere Posted October 4, 2003 Share Posted October 4, 2003 ASV system- Part of the Catalytic Converter system. Adds air to the exhaust to assist the cat in doing it's job. If you remove the cat, and don't block off the ASV tubes, you have extra air in the exhaust. Which causes the back-firing. Look at your exhaust where it bolts to the head. Follow those metal tubes up, and you will find the rest of the ASV system. Off of that, is 1, or 2 hoses that go to the breather can, AKA- air filter canister, on the carb. That's where I blocked mine off. Just pulled them from the breather, and stuck a plug in the hose, capped the tube on the breather also. Don't want dirt getting in there...... Quote Link to comment Share on other sites More sharing options...
RubySuby Posted October 4, 2003 Author Share Posted October 4, 2003 And this fixed your problem? got any pics on the plugs and that? i'm noob at engine problems sry lol clint. Quote Link to comment Share on other sites More sharing options...
Geach Posted October 6, 2003 Share Posted October 6, 2003 hey man, my 90L wagon with a weber pops like that too, exactly as you described. I have blocked the air injection valve with welder. the little injector pipe joins on the left hand bank just where the header joins the block. still pops on changes. sounds kinda cool.... Quote Link to comment Share on other sites More sharing options...
Caboobaroo Posted October 6, 2003 Share Posted October 6, 2003 hey it makes your car sound like a rally car:brow: Thats like 50 horsepower right there man!!! Quote Link to comment Share on other sites More sharing options...
RubySuby Posted October 7, 2003 Author Share Posted October 7, 2003 50hp??? me car's more then that.. anyway i'll might try adding a turbo muffler before the rear axle then out ot my chrome muffler.. see if i gain any back pressure doing that.. clint. Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted October 7, 2003 Share Posted October 7, 2003 You probably need a new EGR vavle (or maybe just clean it), and there should be an anti-backfire valve near the firewall on the drivers side. There's a big tube going to it from the EGR..... either of these parts will cause backfireing on decel. I've never heard of the AIS system causeing this, and I wouldn't think it would - why would adding a little more air to your exhaust cause backfireing? I need a more technical explanation of that one. Backfireing is usually the explosion of unburnt fuels in the exhaust..... I suppose the added oxygen from the AIS might help that along, but I'm not sure. GD Quote Link to comment Share on other sites More sharing options...
RubySuby Posted October 7, 2003 Author Share Posted October 7, 2003 hmm i have a anti- back firign vavle on the passanger side of me car, it's a gold, Mine makes a spshhhh liek a blow off vavle when i let the accell off. clint. Quote Link to comment Share on other sites More sharing options...
Geach Posted October 7, 2003 Share Posted October 7, 2003 mine doesn't backfire, it just pops when I take the foot off the loud pedal and change gears. btw I have all of 60hp atw, last time I checked!!! the abv wooshes on mine too. I assume yours connects to the back of the manifold on the right ruby? it is an ULP EA81 you've got in your brumbles? Quote Link to comment Share on other sites More sharing options...
RubySuby Posted October 8, 2003 Author Share Posted October 8, 2003 yes mines a unleaded only brumby, (I run Shall Optimax 98% octance) in it. clint. Quote Link to comment Share on other sites More sharing options...
xforxlifex Posted October 8, 2003 Share Posted October 8, 2003 My 89 rx pops when shifting gears. its usually either 2nd or third and it makes the noist as the gear goes in. and it does sound like its comming from the exhaust. I have custom duals with no mufflers. LOUD!!!:moon: Quote Link to comment Share on other sites More sharing options...
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