MellowYellow01

I have a 01 gt with 13000 miles on it .My question is~DO 4.6 motors need a tune up?I keep reading about new high performance spark plugs.Has anyone done this ?Is there any noticable difference in performance?I'm always noticing a knocking/pinging noise and i 'm wondering if theres a problem or if i just need a tune up!

Colorado_Mustang

I change my plugs every 15k miles. I was changing at 20k miles, but the performance difference was too large before/after plugs, so I shortened the interval.

Pinging and knocking can be a sign of carbon buildup in the cylinders, which will raise the CR and introduce hotspots. Do you rev your engine very high once in a while?

blueherd02gt

my 02 gt has 14k miles and I've done three so far....to answer your question yes they need tune ups and if your stock go motorcraft ftw

MellowYellow01

when you say rev .How high do you meen?

MellowYellow01

do you men sitting still reving it ?

yuengling910

what gas are you running? try a higher octane and see if the noise goes away. are you sure it's not valve train/ fuel injector noise?

Colorado_Mustang

I mean, do you run to redline while running through the gears? ie, make the engine work a little. Engines really don't like to be lugged around below 2k rpm...especially these mod motors. They need to rev to work properly.