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It is 8-10 degree before top dead center with engine warmed to operating temp., RPM's at the proper range and the check engine connector jumped at TE1 and E1.
12 degress after top dead center
Ignition Timing degree B.T.D.C at idle speed 20 degree plus or minus 2 degree
18436572 same as all Chevy v-8s that is the firing order, not the ignition timing. timing varies between vehicles. a sticker under hood will give timing info, or a Haynes or Chilton service manual
Ignition timing is off.
Generally, 8 degrees before top dead center is typical of Chevrolet V8 engines for many years including your 1985 model.
8 degrees BTDC ( or 10 degrees BTDC if high output engine )
www.motorcraft.com shows the ignition timing for a 1985 F-150 - 4.9 L 6 cylinder as ( 10 degrees BTDC ) If information on engine compartment sticker is different , use the sticker information
Automatic transmission - 10 degress BTDC Manual transmission - 6 degrees BTDC
I know the timing is 6 degrees Before TDC but I don't know what the idle RPM is.. I'm trying to find that myself right now...
Eleoncio Mercedes died in 1985.