Brief rough idle
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Lead Driver
Joined: Oct 2003
Posts: 8,476
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From: Madison, WI
Brief rough idle
'95 F250 4x4, ZF5, 154,000-ish miles. No chip or mods. Search turned up nothing relevant.
We get a rough idle, but only under certain circumstances. After cruising at road or highway speed, normal operating temp (well, as far as the lame-@$$ factory gauge goes), you come to a stop (say, an exit ramp), and the idle is kinda rough. Not violently so, just not as smooth as usual. We've been forgetting to look at the tach when this happens. A quick tap of the go-pedal, and she revs up a bit and settles back down to a perfectly smooth idle. Then it doesn't occur again until you reach cruising speed, and then come to a stop again. WTF?
Performance otherwise is unchanged; it gets up and goes like it always has. Looks like all the fuel here is now ULSD; we put the label dose of Power Service white-bottle in just about every tank. No 2-cycle oil (yet). Engine oil is Rotella-T _synth_ 5W40, prob. due for a change (aprx. 4000 miles).
Oh, and I'm not even sure if it happens every time with the above circumstances; I'm not the daily driver.
We get a rough idle, but only under certain circumstances. After cruising at road or highway speed, normal operating temp (well, as far as the lame-@$$ factory gauge goes), you come to a stop (say, an exit ramp), and the idle is kinda rough. Not violently so, just not as smooth as usual. We've been forgetting to look at the tach when this happens. A quick tap of the go-pedal, and she revs up a bit and settles back down to a perfectly smooth idle. Then it doesn't occur again until you reach cruising speed, and then come to a stop again. WTF?
Performance otherwise is unchanged; it gets up and goes like it always has. Looks like all the fuel here is now ULSD; we put the label dose of Power Service white-bottle in just about every tank. No 2-cycle oil (yet). Engine oil is Rotella-T _synth_ 5W40, prob. due for a change (aprx. 4000 miles).
Oh, and I'm not even sure if it happens every time with the above circumstances; I'm not the daily driver.
