[honks]

just adjusted my tappets in my 95 sierra put the dizzy back in and set the timing at 8 deg starts ok but has a random miss fire not at revs but at idle it is more notice able when you stand behind the car sounds like a pop in the exhaust. the car has new plugs,leads,dizzy cap,rotor button so i don't know where to start

[eldo]

i would say you have a tappet that is out of adjustment, should sound like a little pop sound

[honks]

i hope not i checked them twice when i did them and went right in the middle of the tolerances. for inlet it's ment to be between .13-.17mm and i went .15 and exhaust is ment to be .16-.20 and i went.18 it has me stumped

[eldo]

hey im no mechanic, so wait until somone else replys. i know the sound you are describing and i have heard it before when my tappets were out after doing a head gasket

[whincup]

this is something ive never thought of before, but my car used to make this noise quite frequently, a little pop from the exhaust at idle. doesnt do it anymore, and now i think about it, it stopped at about the time i had the tappets adjusted... so as everyone else says, id start there.

[Ben_Sierra]

Presumably using those clearances the engine was stone cold and hadn't been started for a while when you did it?

[honks]

thats it was cold it doesn't miss under load or while driving just at idle i might do it again with the engine warm and use the tolerances for that