Base Ignition Timing, 4.9

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Aug 12, 2006 | 07:18 PM

mantta

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Base Ignition Timing, 4.9

Does anyone out there know what the base ignition timing is on an 88 F-150 with the 4.9 and an AOD tranny? My vehicle emmisions decal has been missing since I have owned the truck. I am thinking that it is 10 degrees BTDC.
Thanks!

Aug 13, 2006 | 05:23 PM

mantta

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I pulled the spout plug today and put a timing light on it and the base timing was around TDC. I moved it up to around 11 Degrees BTDC and took it for a ride, wow, what a difference. Not pinging either.

Aug 13, 2006 | 05:51 PM

quicklook2

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10 degrees btdc with spout removed is the stock setting.

why was yours so far off? how long were you driving it like that?

Aug 13, 2006 | 05:53 PM

mantta

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I have had the truck for six years, I never have checked the timing on it. It only has 78,000 original miles on it right now.

Aug 13, 2006 | 07:21 PM

optikal illushun

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try moving it to 12 then 13 and maybe 14...see which is better for u.

but its 10* BTDC.

Aug 13, 2006 | 08:51 PM

quicklook2

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than all that time it was running ok?

does not seem like it should have.

Last edited by quicklook2; Aug 13, 2006 at 08:54 PM.

Aug 14, 2006 | 09:45 AM

mantta

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It started fine and ran olay but, it did not seem to have the power it should. It has it now! I also checked the fuel pressure and it is 46 psi.

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Aug 14, 2006 | 10:12 AM

mantta

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I have never had a 4.9 before. I made three 3000 mile trips with it and averaged around 19 MPG on the interstate. It just did not have the get up and go my old 390 had in my 71 F-100 but, I thought hack, it is a six.