Back Popping

[stangguy50]

i have my 84 gt which has been stored for about 12 years...when i get on it a little bit and let off it likes to back fire....anyone know what could be causing this?

 

[MustangPunk302]

Is it bad??? I mean **** it could be a few things. Worst case your seals on the exhaust valves are shot, but I highly doubt it... It could be running rich and the cat is clogged and causing backfiring. Does it do it everytime time you get on it??

 

[stangguy50]

no..not everytime...and it has no cat... it does smell like it could be running rich

 

[stangguy50]

but how do i fix that?


wanna help??

 

[MustangPunk302]

I know it runs rich, not to mention it's carboned up as hell, because when you get on it thick black smoke comes out...

 

[stangguy50]

how do i fix it?

 

[MustangPunk302]

Depends what it really is... If it's cause it's running rich, then you need to lean it out somehow. It's CFI and I pretty much know **** about CFI, but most EFI systems are "basically" the same. Does it only do it after the motor warms up? When it's cold? Both? If it does it only when it's warm you may need to replace the 02 sensor.. Is it a series of popping or just one loud bang?

 

[stangguy50]

one loud...and mostly when its warm and i really rip on it

 

[blkstangman88]

timing? distribitor loose? mine pops really loud, or it did, adjusted the timeing and it all stopped.