I've heard that the stock timing on a TBI is 0* but I also read that you could get better performance by advancing that up to 4*. Haynes isn't telling me what the stock timing is, I don't have any labels under my hood that tell me either, nor do I have the manual for the car (6th owner, sheesh). Does anybody out there know?

I'm doing it tonight so I need a response like quicktime. Thanks alot.

Oh, one other thing, which WAY do you turn the distributor to advance the timing, clockwise or counter?

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'91 Firebird
305/TBI/700R4/T-tops
Mods: Catco high flow cat - B&M Shift kit - Taylor 8mm Spiro-Pro's - ACDelco Rapidfire Plugs - K&N Air Filter - Trans Am tail light conversion
Stereo: Pioneer DEH-P8200R - Pioneer 6x9's - Kenwood 8" Tube
'91 Pics

'87 Firebird
2.8L/MPFI/700R4/220K Miles on its original, never been rebuilt engine!
Car being parted and sold, just ask what I have.
'87 Pics

 

Base timing-the position the ECM uses as a reference for advance during operation- is set at 0 degrees from the factory. The tune up/emissions label under the hood should tell you this.


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Mongoose-NCTGA-1990 Pontiac Formula/305 TBI-700R4 with Edelbrock Performer TBI intake,TES headers,and STB,K&N,MSD-6AL,Holley laser shot coil,Accel Extreme 9000 wires,Jet Stage 2 chip,TCI shift kit with corvette servo,Richmond 3.73 gear with Auburn 3 series posi,no cat,SLP 3" cat back,Eibach sportline springs,Energy Suspension poly throughout,Lakewood LCA and adjustable panhard bar package,SSM subframe connectors,IROC wonder bar,Tokico 5 way adjustable struts and shocks,Autometer electric fuel pressure gauge,Alpine,JL Audio,MB Quart,92 GTA taillights,92 GTA aero wing and hatch,Steve Spohn LCA relocater kit,MacEwen White face gauges,84 T/A cold air induction air cleaner.

 

Zero is good, but 6BTDC is the best for mostly stock car