ix3

my friends mustang is a 98gt, it has a built engine 4.6liter SOHC, lowered compression for a supercharger, i dont remember what kind of supercharger, but he had alot of work done and he had the car tuned and dynoed.

month later he starts his car with a loud tapping noise, the sound is coming from the drivers side head from the back 2 cyl. loud tick is consistent with the engines rpm's.

im thinking it could be a valve,lifter,or me something needs to be tightened?

could this just be a rocker that needs to be adjusted?
if i go to take the valve cover off what do i look for exactly? im not very experienced with ford heads and valve train

anyinfo is greatly appreciated thanks

jerry

Jglisson

I know this is going to sound off the wall, but I have seen this happen several times on the 1996-1999 4.6 motors. The spark plug loosen in the head and will rattle in the thread holes. Eventually, the plug will blow out destroy your coil/plug wire and occasionally make an attempt at putting a nice fat dent in your hood. Check the plugs on 2 and see what you've got. It is easy to check and a real possibility. Beyond that...you could have an exhaust leak, valve problem (not too common though).

What is built on the motor, just the bottom end?

ix3

umm all forged internals, everything was ported, race cams etc.

dlazrael

p/p and internals wont matter a bit about sparks man :-p check the sparks had similar problems with my 95 gt vert