lean or mean

Crazyhorse · Post by **Crazyhorse** » Tue Jul 24, 2007 11:00 pm

G'day im new to subi's just wondering if its normal for them to pop n fart through the pipes on the overun eg when changing gear a friend tells me its normal i would've thought its running lean ?

:)

Matatak · Post by **Matatak** » Tue Jul 24, 2007 11:03 pm

wt ride u got and engine?

mine doesnt do nething liek that only when engine breaking pretty hard on it lol
i def wuldnt think its normal to do it on gear changes but
as for wts cuasing it im unsure

YouTube · Post by **El_Freddo** » Wed Jul 25, 2007 2:00 pm

You've got an exhaust leak somewhere... the popping your hearing is un-burnt fuel in the exhaust on engine braking, this sucks air into the exhaust from the outside atmosphere allowing more oxygen to mix and create an explosion in the exhaust pipe. Find the leak and fix it, problem solved. Easier said than done sometimes though.

It only has to be a small hole...

Cheers

BrennyV · Post by **BrennyV** » Wed Jul 25, 2007 2:34 pm

Don’t think i agree with you on that one mate, think we really need to know what engine/setup he is running before we can draw any conclusions.

My sti pops and claps trying to tell me that i have a leak? :P

Phizinza · Post by **Phizinza** » Wed Jul 25, 2007 4:37 pm

My EA81dc done it under heavy engine braking, and so does my EJ22 (on same exhaust, only the 22 has a Cat.)
I kinda like it, eheh.

Crazyhorse · Post by **Crazyhorse** » Wed Jul 25, 2007 8:43 pm

91 brumby 108k stock carb zorst etc thanks guys

Suby Wan Kenobi · Post by **Suby Wan Kenobi** » Wed Jul 25, 2007 9:38 pm

Through the pipe rich through the carb lean. You could also have an issue with your anit back fire valve. Its the thing on the LH side of the engine bay that looks like a small dumbell standing up. It could be black plastic or made of alloy

Matatak · Post by **Matatak** » Wed Jul 25, 2007 10:08 pm

anti backfire valve
never noticed one on my car
might have to take another look to see if i can find one