Vibrating or rattling noise?????

[JRoss22]

  Ok so ever since I put my gas tank back in my car dont know if this is related to it or not, When ever I am driving the car and I have the throttle pushed down it sounds like either the drive shaft is vibrating or the transmission is. I can try to record the sound next time I have the car out and am driving it but I amd wondering what could be making the sound. It is coming from closer to the firewall from what I can hear so maybe it could be something with the engine. Anyone

[Chryco Psycho]

too many possibilities , could be wheels or driveshaft out of balance & possibly a bad trans mount or about 100 other things

[JRoss22]

I was afraid it would be to hard to pin point....

[Carlwalski]

Any other way you can describe it Ross? 

As Chryco said there could be many different possibilities.

[JRoss22]

I just confered with my dad as I pointed it out to him while I let him drive my car today. He says he thinks its something with the valves i think he called it a valve tappet or something like that from using cheap gas. .. But back to the sound now that I think of it the sound has more of a knocking noise to it.. Its just all so confusing maybe I will take the car out again first thing in the morning when I wake up to re-think over the sound.

[Carlwalski]

Lifter noise eh. 

[JRoss22]

Could be that and how would I go about figuring if that is the cause of the noise?

[Carlwalski]

Could be that and how would I go about figuring if that is the cause of the noise?

Good question, Chryco will know. For starters you'll need to get into it.

May need some new lifters. Chryco? 

[JRoss22]

That is a good question.. And Chryco is just the man to know that answer... Gotta love having his knowledge of these cars

[Chryco Psycho]

if it is cheap gas it is pinging , it should happen when you floor at at low RPM , otherwise known as detonation which can distroy an engine
 for the most part lifters are very reliable & will never make a sound unless they will not hold pressure at that point the pushrods will hit the rocker arm possibly bending it plus the valve will not open causing a misfire aswell  

[Chryco Psycho]

pinging can be stopped by using better fuel or retarding the timing slightly

[JRoss22]

How would I go about retarding the timing.. Thats all new to me or should I stop using arco gas as price wise its the cheapest out here?

[Chryco Psycho]

to retard the timing you need to loosen the dist & rotate it very slightly [clockwise on a small block & counterclockwise on a big block ]

[JRoss22]

Thanks CP I will try that tomorrow and see if it solves the problem and if it doesnt solve it .... Well if it doesnt solve it I am going to take the car down to the local resto shop and see if they can help me pin point the problem and solution to it....

[67Vette427]

When you retard the timing the engine rpm should decrease. You may need to adjust your idle. Get a timing light too. If you advance it the rpm will increase. You can also throw a can of octane booster in which should counter act the cheap gas quickly.