smkshw

I got a 91 lx 5.0,not much done to it,I have flowmaster exaust and 3.73 gears.Just wondering,when I take the rpms up high,it gives me a popping sound,not so much a back fire, but an embarissing popping sound when I power shift,any idea why it does this?..thanks, if anyone can help....

DR8907

Could be an exaust leak... I would check that out.

RacerX

maybe it could be the EGR valve or smog equiptment?

schwindty

Did you pull codes to see if your running rich/lean?

qwikgtpony

It might be because there is a gasoline vapor build up when you top off a gear and when you shift and the valve opens up rapidly the spark ignites it and causes a small pop or back fire. I would get a set of headers and or a mid-pipe for a more freely flowing exhaust

C/Note

broken vavle spring ....possible!