Ok my car was runny ****ty and I couldnt figure out why until my spark plug came out when I tryed to pull my spark plug wire off to check it any Idea on why it made it self LOOSE or come out any ways of prventing this? Thanks

-LeDevil

My dad's old Ford pickup did this once... we never did figure it out. Going down the driveway, sounded like it was missing a cylinder. Popped the hood, and the plug was sitting there on the block. Kinda funny, in retrospect, but at the time, we were pretty confused.

It may have become loose because it was not sufficiently tightened or because the threads in the hole are bad.

 

Try torquing the plug to 15 ft*lbf, if it comes loose again the chances are that the threads are bad.

I had this problem withan 84 gl. The hole was cross threaded and a simple re-tap fixed it up quick. This is a common thing with aluminum heads.

Cool, Thanks for the help

LeDevil

I had this problem withan 84 gl. The hole was cross threaded and a simple re-tap fixed it up quick. This is a common thing with aluminum heads.

 

speaking of which...I need to retap a plug hole and I have some question.

 

What size and thread tap do I need?

 

What do you do about shavings that drop into the cylinder?

 

Anyone know a good place to order a tap? (I had a helluva time trying to find the right size/thread for the head bolts...I finally gave up.)

I think I'd try a helicoil. They have some that just screw into the damaged thread. Tell the parts house what you have and ask what ya need for it.

 

wish ya smooth threading.

 

boing