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Christ · 03-28-2010, 08:41 PM

For future reference, the ignition system in the 1996 F150 with EFI 4.9 employs a distributor that CANNOT be used to adjust base ignition timing (except a few degrees).

The ECM needs the signal from the hall effect sensor to determine TDC, and it's linked to the rotor. Advancing the hall effect sensor causes the ECM to over compensate with the timing, causing serious knock issues under any load.

I had to drive home using less than 20% throttle and keeping under 2k yesterday, with the bed loaded up with a few hundred pounds of scrap. SSSSSLLLLLLOOOOOOOWWWWWW.

03-28-2010, 08:41 PM	#100 (permalink)
Christ Moderate your Moderation. Join Date: Nov 2008 Location: Troy, Pa. Posts: 8,919 Pasta - '96 Volkswagen Passat TDi 90 day: 45.22 mpg (US) Thanks: 1,369 Thanked 430 Times in 353 Posts	For future reference, the ignition system in the 1996 F150 with EFI 4.9 employs a distributor that CANNOT be used to adjust base ignition timing (except a few degrees). The ECM needs the signal from the hall effect sensor to determine TDC, and it's linked to the rotor. Advancing the hall effect sensor causes the ECM to over compensate with the timing, causing serious knock issues under any load. I had to drive home using less than 20% throttle and keeping under 2k yesterday, with the bed loaded up with a few hundred pounds of scrap. SSSSSLLLLLLOOOOOOOWWWWWW. __________________ "¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"