Base ignition timing is set at 10 degrees BTDC. This means that when you have a jumper wire in the diagnostic box (just like checking for a check engine light) and a timing light aimed at the crank pulley, with each strobe the notch will be lined up with the 10 on the lower timing cover (piece of metal behind the crank pulley). Once that is set, pull the jumper wire out of the diagnostic box and make sure that the timing advances (usually to about 12 degrees BTDC).
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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