Dodgy V8 Engine?

Question

So i'm going about my usual before work routine in the morning, as im doing that I start my car to warm it up before work.. I start it up and it idles nicely, then I go inside to grab my cell phone and when I get outside its making a clunking sound.. The car is a pontiac transam and the engine is a smallblock 400 chevy and its just been serviced by my mechanic.. The only way I can describe the sound, is the sound your engine makes when it overruns (when ya turn the key off and it keeps on trying to run) the timing is good, the oil is sweet, the coolant is where it should be.. What makes an engine do that???

Nah done the carb cleaner thing and cleaned the plugs.. Its getting worse and its real hard to tell where the sounds is coming from, if i had to say, it would be central (were the pushrods and that are).. Now the sound (still the same) is in rhym with the engine and speeds up when ya rev the engine.. Smoke is coming out from the rocker cover, where you add oil.. Think it might be %^$&ed.. Year of the car is 1980.. Time for a 454???

Oh yeah its also going in and out.. Sometime the noise goes away, then it comes back...

Answer 1

if its an older T/A its carburated.The choke is probably closing up on ya. Its starving for air.Spray it down with carb cleaner and if that dont work have it serviced.vacuum choke pull of is probably the prob

Answer 2

i own a shop,and its very possible you have a bad dose of gas in it,or it has drawn moisture,this will cause it to do this once in a while,other than that ,like you said everything is in good shape on it,so its probably just a once in a while thing,it may never do it again on you ,but if it does id add some gas treatment to it,and see if that helped it any,good luck,i hope this help,s.

Answer 3

sound like it loading up on gas, other word get to much gas while sitting

Answer 4

bad gas