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86GT · 04-26-2005, 10:08 AM

If the EEC sees the idle as being to high it will reduce spark. If you are constantly above the desired idle the spark will go down as far as 15. Then if there is multipliers for ACT and ECT the spark could go lower. It seems as if the TB set screw is set to high. The EEC can not control the idle, so it tries the best it can by lowering the spark to its max.

I personally have not looked into the final calculation for the spark. I have not needed to. I just use the three spark tables in the tables section.

Keep in mind that FN901 is used under loads defined by FN125. Table FN904a and 905a are used if the load exceeds FN125. You then have to add all of the multipliers and adders.

04-26-2005, 10:08 AM	#4
86GT Member Join Date: Mar 2005 Location: Sacramento California Posts: 449	Re: Why is my timng at idle 13.500 degrees? If the EEC sees the idle as being to high it will reduce spark. If you are constantly above the desired idle the spark will go down as far as 15. Then if there is multipliers for ACT and ECT the spark could go lower. It seems as if the TB set screw is set to high. The EEC can not control the idle, so it tries the best it can by lowering the spark to its max. I personally have not looked into the final calculation for the spark. I have not needed to. I just use the three spark tables in the tables section. Keep in mind that FN901 is used under loads defined by FN125. Table FN904a and 905a are used if the load exceeds FN125. You then have to add all of the multipliers and adders. __________________ EEC Analyzer A9M, TwEECer, 306ci, 73mm C&L w Tuner Tube, Cobra Intake, 42# inj, Edelbrock 6037, E303 cam, 155 fuel pump, FPR, 70mm TB, E-Fan, 3.55 gears, Powerdyne 9psi actual 5psi...way more.