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I recently gutted my catatlyic converter and cut off my muffler. I still need to weld on some more pipe to get the exhaust out from under the car. But I get this backfire sound going on. It sound like some damn kid just kit my car with a rock. Also it usally does it when I shift or let off the accelerator. It will do it random. Sometimes it does it every 5 mins and other times maybe only a few times a day. :help:
hey it does that on my car too. i just put a glass pack on it and ever since it has been backfireing. oh well i think it sounds cool but that's just me.
You could have bad plugs (could be part of the problem)
check your timing. if it is off it will backfire.
backfiring somtimes is caused by running way lean
I figured that it was running to lean because of bad plugs, but I haven't had time to check. I'll check it today too see but I'm pretty sure that it is my plugs.
I can't figure it out. It ran fine untill I gutted the cat and cut off the muffler. My friend has a gutted cat on his 88 and has no problems.
his 88 was probably EFI
your A/F mixture is way off
Yes I know that backfireing is caused by the air/fuel mixture, but the thing is that it ran perfectly fine untill I gutted the cat and cut off the muffler. I don't see how doing that will mess up the air/fuel mixture. Also my friends 88 is a carb. (Lx)
it changes the air flow. if the airflows different your mixture is different. I've seen so many people mess with intake and exauhst and not touch the carb. I can't explain it the best but im sure the carb gurus can
Ok thanks I'm still kind of lost on how the exhaust can mess up the air/fuel, but I'll try and mess with the air/fuel mix to see if I can fix it.
i have an 88 LX-i with a gutted cat and 2.25 from the cat back to an OBX muffler, and i get the same popping sound when i let off or shift, i think mine is due to an exhaust leak, because its nowhere near as loud as a back fire, but more of a popping coming for the exhaust, not like a glass pack 'cackles' when gearing down, but just a random pop when letting off or shifting.
