PO455,sorry,if,i,already,posted,this!

yukon25008.1 · August 4, 2012

all,the,comma,s,are,because,my,daughter,ripped,off,the,space,bar...

I,have,a,po455...and,its,saying,somethinng,about,a,large,leak....and,its,not,the,gas,cap..

This,code,was,presennt,before,all,the,work,i,did,..Cam,water,pump,manifolds,ETC...

8.1HD/ALLISON · August 5, 2012

You have a leak in the evap system. Need to have it smoke tested with scan tool and the smoke cart at your local dealer.

txab · August 5, 2012

+1

yukon25008.1 · August 19, 2012

never,heard,of,the,smoke,test,

jandersinc · August 31, 2012

A,new,keyboard,is,only,about,$10,for,a,cheap,one....

I couldn't resist. I had to try typing like that.

yukon25008.1 · August 31, 2012

HA....

8.1HD/ALLISON · September 1, 2012

<-- LOL

Smoke test is slang. They take a tech 2 and and close the evap and purge valves. Then hook a machine up that introduces smoke into the evap system and look for leaks. Sometimes it can be a real pain in the butt to find, especially when its a small pinhole in a line on top of the fuel tank or somthing.