Posted by Brad Gyde on November 29, 2011 at 18:26:23 from (50.42.143.88):
Hey all, I know I'm not the only one here still running a IDI 6.9/7.3, so I'm hoping someone else has experienced my issue.
I have a 86 Ford that had the 6.9, I re-powered it with the 7.3 a few years back.. I've noticed the last few days as we've began to get colder I've been starting harder, and starting to seem like the battery is drawn down, so tonight, (since I had charging issues a few months back) I popped the hood and began to inspect.. Checked this and that and noticed it sounds like the alternator (that was replaced not too awful long ago) has something going on inside (sounds like bad bearing/bushing), but is charging still..
The charging has little to nothing to do with my actual problem, which is this: I noticed tonight, while checking charge voltage and whatnot, I would rev the truck up to approximately what would be cruising rpm's (say 1800ish).. If I let it come down slowly, no issues.. If I just let it go from the higher idle to curb idle, it would continue to run a second, stumble, and stall.. Will restart right back up just like if the key was switched off then restarted. I found this out accidentally, while revving the truck up from under the hood and watching a voltmeter, and my finger slipped off the accelerator lever, and that was the result.. Checked result about a dozen times, same thing happened.. Would do it from a lesser rpm as well, from under the hood or from in the cab, just had to be a fast deceleration.
I've never noticed the truck doing this before, and can't say it has ever troubled.. Of course, i usually don't throttle down that fast. I give the curb idle screw a turn or so (I'd say an increase of 25-50 rpms) and it didn't seem to do it following that.. Only time it has ever stalled is when it's real cold and the truck hasn't been plugged in it will occasionally stall after a second of running.. cycle the plugs again and good to go.
Anyone ever have this issue? Do I possibly have a serious issue brewing, or am I being over-concerned? It's currently my daily driver, so I'd prefer to keep it running as opposed to be left having to walk.. AGAIN, other than accidentally finding this out, it runs/drives just the same as it has since i installed the engine over 2 years ago.
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