my 83 motor runs but every once in a while it backfires it is really loud and i have checked the timing but i dont know what to do help

 

its a RX7 thing...they do it all the time 1 of the benifts to owning a rx7 woot

 

When is the car backfiring?

 

Once You pop, You cant stop

 

pringles apparently just joined the list of rotary sponsors......

 

my SE always 'pops' some when it hasn't fully warmed up
once at temp it hardly ever 'pops'.....I'm starting to think that's not normal

 

Okay The Car Is Doing Something Different Now When You Are Driving It Wont Rev Fast Like Normal Its Just Like Blaaaaa And It Wont Go Past Six And U Will Just Be Going Wooded And It Will All The Suden Just Go Like Normal And Then Cut Out Again And I Made It Have Mechanical Secondarys So Its Not That Chev Man Out

 

Check your fuel filter, in fact just replace it.

 

Get some video of some flames!!!!

 

Most likely cause is a leak in your exhaust. And btw, it is not normal for a rotary to backfire.

 

Really? Mine backfired BAD, shot flames and all, until I removed my rats nest and smog pump stuffs... now it's SMOOTH with no backfiring. I thought it was somewhat 'normal' for the seven's to backfire a bit.

 

I agree, its not normal for ANY engine to backfire. Normally, backfiring is caused by either an exhaust leak letting in enough oxygen to ignite the unburned fuel or an excessively rich running condition where there is enough fuel that it just makes a little explosion in the exhaust system due to heat, which is excessive on a rotary. I've actually heard of mufflers being blown apart from this. But a properly tuned engine with no exhaust leaks is not likely going to backfire a whole lot. Timing has a lot to do with it as well because it can change how well the fuel is burned and can let more unburned fuel into the exhaust system causing backfires.

 

thanks