If it's the same as the 2000 it looks relatively simple. Remove the plastic trunk liner by hand and then use a socket wrench (7/16" socket- most likely) and remove 4 nuts- It should then wiggle free.
2004 Toyota celica stereo diagram
5x100
The pcv valve should be located on top of the valve cover. It plugs in, and should pull out with some gentle coaxing.
How i remove eveporator unit from toyota corolla 2002
twist it HARD
Pulstar Iridium Pulse Plug
Try e-Bay. I've seen them in there.
it takes 5 quarts. the same amount for any small engine car. be sure to remove and drain the filter during this process and to install a new one. well that's a load of crap^^My 2002 Toyota Celica GT takes only 3.7 USQuarts.
REMOVE SQUARE PLASTIC PLATE(I USED A STANLEY BLADE)TO REVEAL 4 XPLY SCREWS ,NO NEED TO REMOVE JUST SLACKEN THEM AND PULL MIRROR YOURS T,C U/K
its part of the mass airflow sensor bolted to the airbox.
please check out this website: http://www.mr2-tech.com/bgb/mechanical/volume2/brake_system.htm click on " pe36t" this is the same system as your (and my) celica
im having the same issue with my 2002 celica gt just one click and nothing did you ever figure this out?