Why is the exhaust popping?

[Frank Adams]

It could be a exh leak.

I tried every available map there is and they all had the same results.

I took it as unburnt exh gas built up in the pipe.

I wasn't for sure if the pair was holding extra unburnt exh since it was still on there but not working.

 

[OB_Mambo Kid]

Maybe the PAIR is still working! All I know is my popping on deceleration went away after I completely removed the PAIR.

 

[OB_NumbNuts]

hey mambo Kid, you might have something....

I dont know how the internals of the pair look, but if some exhaust gas went down one cylinder tube, and then into another............. because the intake was blocked off, so it was using only available route.......hhmmmmmmm interesting concept, will have to look in manual to see workings of PAIR

 

[DaveO]

Frank,

Pair's function is to inject fresh air from airbox into the exhaust, thus diluting the exhaust hydrocarbons. As we know, when running a pipe on our Busa's, injecting this fresh air causes exhaust backfires upon deceleration. An exhaust leak @ spigots, will result in same the popping result.

Dave

 

[Frank Adams]

I can see the removal of his pair valve will be the next step.

I'm sure that will cure it, I hope!

 

[Frank Adams]

I should know how to fix this but I guess I forgot?!!

I ran across a Busa with the flapper removed, Yosh Pipe, and a PC2.

I tried several maps, map combonations, and plugged the pair valve from the airbox.

No luck!

It pops and shoots a small flame from 3,500 rpm and below on deaceleration ONLY.
The pipe still has all the packing.

I'M LOST.

What am I forgeting???

Thanks!

 

[OB_Sonic Boom]

TPS maybe?

 

[Frank Adams]

I Took care of that already.

Right on Zero.(0)

 

[Frank Adams]

The throttle bodies being out of sinc wouldn't do this would they?

 

[DaveO]

Frank,

Exhaust leak @ header???

Dave

 

[OB_BadBoy]

Frank,

Did you check the spark plug gap?

Get rid of that Yosh Pipe they're JUNK!

 

[OB_Sonic Boom]

Ditto DaveO. Or exhaust gaskets.

[This message has been edited by Sonic Boom (edited 09 August 2000).]

 

[OB_bigabusa]

your to lean on idle setting, is your tps set right?

 

[OB_BadBoy]

bigabusa, read up above a little. He said he has it at zero now.

Wake Up!!

 

[OB_ZXALAN]

Hey Badboy, what pipe you got?How does your bike do on the strip?