IAT mod on FFV engines -- doesn't work properly
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Joined: Jun 2004
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From: Kennett Square, PA
That's what I thought, Bob -- but I have put it through some "severe service" at times. I was glad to hear they thought the traction bars were good and not a problem. You never know how they're going to react to certain mods.
NOTE: this post belongs AFTER the post below. Beats me how it got up here.
NOTE: this post belongs AFTER the post below. Beats me how it got up here.
Glad you found the root cause, John. Also good to hear that it was not the diff. Your 8.8 should be able to handle whatever your 3.0 can dish out, even if you decide to run it on E85 rocket fuel!
(see E85 exposé above)
(see E85 exposé above)
In response to the question about how does the timing adjust to the fuel octane if it is higher than the designed (87) octane?
Asked my intructor at my local technical college, who is a retired Ford engineer/field engineer. He says on fords, i can't remember if it occurs when the engine is first cranked or if this occurs constantly (causing the erradic timing on the chart). The PCM slowly advances timing while reading the knock sensor inputs, as the timing is advanced and the knock sensor starts picking up pinging, it retards the timing a few degrees until the pinging is gone, and then advances the timing again about 2-3 degrees and that is how it determines the timing.
So a higher octane fuel would allow the PCM to advance the timing further without any knock sensor discrefencies (spell?) than a lower octane.
Asked my intructor at my local technical college, who is a retired Ford engineer/field engineer. He says on fords, i can't remember if it occurs when the engine is first cranked or if this occurs constantly (causing the erradic timing on the chart). The PCM slowly advances timing while reading the knock sensor inputs, as the timing is advanced and the knock sensor starts picking up pinging, it retards the timing a few degrees until the pinging is gone, and then advances the timing again about 2-3 degrees and that is how it determines the timing.
So a higher octane fuel would allow the PCM to advance the timing further without any knock sensor discrefencies (spell?) than a lower octane.
Originally Posted by 034x4
In response to the question about how does the timing adjust to the fuel octane if it is higher than the designed (87) octane?
Asked my intructor at my local technical college, who is a retired Ford engineer/field engineer. He says on fords, i can't remember if it occurs when the engine is first cranked or if this occurs constantly (causing the erradic timing on the chart). The PCM slowly advances timing while reading the knock sensor inputs, as the timing is advanced and the knock sensor starts picking up pinging, it retards the timing a few degrees until the pinging is gone, and then advances the timing again about 2-3 degrees and that is how it determines the timing.
So a higher octane fuel would allow the PCM to advance the timing further without any knock sensor discrefencies (spell?) than a lower octane.
Asked my intructor at my local technical college, who is a retired Ford engineer/field engineer. He says on fords, i can't remember if it occurs when the engine is first cranked or if this occurs constantly (causing the erradic timing on the chart). The PCM slowly advances timing while reading the knock sensor inputs, as the timing is advanced and the knock sensor starts picking up pinging, it retards the timing a few degrees until the pinging is gone, and then advances the timing again about 2-3 degrees and that is how it determines the timing.
So a higher octane fuel would allow the PCM to advance the timing further without any knock sensor discrefencies (spell?) than a lower octane.
https://www.ranger-forums.com/forum2...ead.php?t=3252
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stp1_jordo
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Apr 28, 2012 01:51 PM
