I REALLY NEED SOME HELP AND OPINIONS, I HAVE A 99 SILVERADO WITH THE 4.8L AND MY CHECK ENGINE LIGHT SUDDENLY CAME ON. THE TRUCK RAN FINE SO I WENT TO A BUDDY OF MINE TO CHECK WHAT THE CODE WAS BECAUSE HE HAS A SCANNER AND THE CODE CAME OUT TO BE A "P0442 SMALL EVAP LEAK DETECTED". I CHECKED THE GAS CAP TO SEE IF IT WAS LOOSE BUT IT WAS TIGHT, AND I CHECKED ALL THE EVAP LINES AND THE EVAP CANISTER AND EVERYTHING SEEMED OK, SO I DONT KNOW WHAT ELSE TO DO AND I DONT WANT TO BE CHANGING PARTS BECAUSE IT GETS EXPENSIVE. HAS ANYONE CAME ACROSS THIS PROBLEM BEFORE BECAUSE IF YA DID PLEASE LET ME KNOW WHAT YA DID TO FIX THE PROBLEM IM IN NEED OF HELP SO PLEASE HELP, THANKS. ALSO THE TRUCK HAS 127,000 MILES IF THAT HELPS.

 

Reset the code with your friends scanner and then see if it comes back. A small Evap leak can be very difficult to find but sometimes the code will not come back because it is so minor.