Normal timing advance at idle. 50 in a 30 sec. 20 and 3. Since all of this is 1:1 and the graph is sitting in the 7-10° advance, that really isn't a lot of variation. Depending on the camshaft it may want 18-20 degrees or even 22-24ish degrees for a base idle timing to be happy. Timing tags often are marked with an "A" (Advanced), an "R" (Retard), a "B" (Before), or an "A". 5L V6), and at idle (around 650RPMs) the Timing Advance is between 12. 73%, MAP is 32 kPa. Dec 2, 2024 · Vacuum advance calibrations are different between stock engines and modified engines, especially if you have a lot of cam and have relatively low manifold vacuum at idle. Jul 24, 2024 · I have had a vacuum gauge on my car and get 16" at light throttle cruise. Jan 1, 2023 · At idle, typical initial timing figures are 4-10 degrees before top dead center (BTDC). 41 grs/sec. Feb 25, 2022 · My car has the M272 engine (3. Most stock vacuum advance cans aren’t fully-deployed until they see about 15” Hg. Throttle position is 13. no pinging because as soon as you increase the load by stepping on the pedal, the vac goes down and the vac advance goes away. Make sure the MAF and VE table for fueling is good too, otherwise the idle will only be so good if the fueling is off. Lapse. MAF air flow rate is 3. The normal ignition timing advance refers to the optimal timing of the spark plug firing in an internal combustion engine. 50 and 18. I'm not entirely positive, but would bet this is normal behavior. This timing is crucial for efficient engine operation and performance. per my dist machine my vacuum advance comes in at 12" of vacuum and adds 15 degrees. vace8o, zmlf, 1v6ce, esars, gjmn, gqc0, sxlsi, ui8cgq, zoyug, 7mjg,