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Right side under dashboard. Remove plastic cover then look for a Round plastic cover.
well not for how but cadillac cateras were only made from 1997 to 2001
should be on rear pass side of engine just to left of plastic engine cover
you dont. a cadillac tech does
under plastic engine cover driver side where fuel line enter. this is pressure regulator. with cover off make sure you have steel lines running to injectors. if not cadillac has a recall on the plastic one and will replace for free
It is under the intake right on top of the engine. Not as bad as it sounds. Remove cover, injector rails (do not disconnect), remove three bolts on the throttle body and the several bolts holding on the big black plastic plenum
There are two relay pannels, one under the right side of the dash (remove the black plastic panel under the dash. the other is the engine compartment on the top of the firewall under the black plastic cover on the passengers side.
Pull it off
remove oil fill cap and pull up on edges. dont be scared... it will pop right off!
They are in the center of the Valve cover, under the plastic "chunks" that are the ignition coils. You might need to remove the plastic engine cover first. There are several plastic clips you need to turn part way to remove this part.
check this out, it's same engine as in Rabbit http://rabbitownersclub.com/vw/showthread.php/engine-plastic-cover-4981.html
You remove the large plastic engine cover from the top of the engine (remove the three plastic caps, then loosen the three 10mm nuts). It's right on the front top of the engine under a plastic cap about 3" in diameter.