i think a compression test just makes sure all your cylinder is working..im not sure though
if your a turbo car check the TSRM itll show you how to do da compression test...
first you unplug your EFI like ihatehack said..buh i always unplug the coil pack just in case....
then you just take your compression tool and screw it on each spark plug one by one
then with about five cranks of the motor.(meaning try & turn on the engine) until you get a steady reading on your compression gauge
den repeat process for the other 5 cylinder
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88turbo targa-white
original Pin Stripe
custom intake-Tenzo filter.....Momo racing seats and steering wheel...
apexi exhaust tip-custom 3" piping. Replaced with RSR GT II
NGK plug and wires
HID conversion head lights
HKS Turbo Timer Type-1 (in black)
Tial BOV
BIC DDP
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