I've noticed for the past few days a mild pinging at a low rpm. You know, like when you slow down to say... 30mph on 3rd shift, and you try to accelerate, and you hear a ping.
My car has never done that. It may be bad fuel, but I also want to know of any other possible causes so I can start checking things out.
Plugs, wires, opti are less than 3 months old. It feels like it may be running a little bit lean. Any ideas?
Thx-Goose

 

Exhaust Leak? I have problems with those...

 

I do have a very small exhaust leak. I'll double check that.
-Goose

 

have you recently filled up?.....if so, was it from the same station you normally go to?....are the guys there a lil slow, and could have put regular in it?

 

Bad fuel,hot weather,high water temp,plug wires cross firing,lean fuel mixture.Just a few.

 

Dirty MAF can do this.

 

definitly check and recheck spark plug wires. id say most of the time its a plug wire.

 

Thanks guys for the suggestions. I now have a good starting point.
I fill up my own gas every time.
-Goose

 

Take a look and see if you notice any blue smoke at the tailpipe.

Oil getting into the combustion chamber will casue detonation.

Also, take flimsy piece of paper such as a well worn dollar bill and hold at next to the exhaust pipe opening so that it would cover the opening if the car wasn't running.

If it sucks the paper inside the tailpipe (hold onto the other end so you don't lose it!) then it's a strong indication of worn rings, which is one way oil can get into the combustion chamber.


Of course, all those other ideas are good too.

 

I think you mean hold the peice of paper over the oil dipstick tube and it should be held in place, not blown away.

I have never heard of vaccume at the tail pipe before.