This topic was originally "Cold Start Injector", but I've got a new question. What is the procedure to set the timing on a '87 GTA, LB9 305 / 700R-4? I read on another site to jump the A&B terminals on the ALDL connector (diagnostic mode) to set the base timing. Now I have just read to disconnect the brown/black striped wire next to the heater box/fan housing. I'm afraid this may have been my problem all along. ------------------ '80 Firebird 355 c.i. Chevy (built) 8.39 E.T. (1/8 mile) Altitude Corrected - 8.27 In the process of being rebuilt and getting 7-second-ized '87 GTA Stock LB9 5.0 / 700R-4 / 3.42 gears T-Tops

BR,

The ALDL jumper procedure is used on older ECMs and some V-6 and I-4 engines to set base timing. Your TPI uses a bypass connector in the EST system to set base timing. There should be a VECI label under the hood describing the adjustment procedure, and it should look like this:



The bypass connector should be disconnected and the base timing set to the specification. Reconnect the bypass connector and you're set. The connector should be found here:



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Later,
Vader
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