I don't understand this
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Mountain Pass
Joined: Mar 2004
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I don't understand this
I have a 2000 EB with a 5.4. Last night I installed a new and now it's driving completely different, and by different I mean worse. Before I changed the alternator my transmission shifed smoothly. Now it's shifting as if I installed a shift kit into it. It snaps into gear rather than gliding into it like it did before. Also, when I come to a stop sign and come to a complete stop the engine RPM goes up and down dramatically (from 500 to 2,000 RPM). It is almost to the point that it feels like it is going to stall. This problem goes away if I put it in park, but who wants to put their truck in park at every stop light.
Anyone have any ideas what could be causing this? Could this just be the computer needing to retrain itself after getting rid of a bad alternator? Any help on this would be greatly appreciated.
Anyone have any ideas what could be causing this? Could this just be the computer needing to retrain itself after getting rid of a bad alternator? Any help on this would be greatly appreciated.
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Odd, I have a 2000 5.4 and I recently changed my batter/alternator and I didn't notice anything like that. Esp. not the RPM changing thing. Also, when you changed your alternator, did you also check the alternator fuse?
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Mountain Pass
Joined: Mar 2004
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I hope I didn't mess something up by doing it this way,but I actually never disconnected my battery when I changed out the alternator. Was this an expensive mistake? Is is possible that my Exp had trained itself to work with an engine that wasn't running very well due to the failing alternator (changing shift patterns, fuel delivery, timing...), and now that the bad alternator had been replaced it needs adjust itself again? I this feasable?
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Mountain Pass
Joined: Mar 2004
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OK, here's an update. I went ahead and replaced the battery because I think the bad alternator killed it (the engine turned over very slowly when I went to lunch today. It was also 7 years old). After changing the battery the issue with the RPM going up and down went away completely, but the hard shifting issue is still there. Could it be that my tranny just needs to adjust itself for an engine that is running properly now?
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The manual says something about this, but again, I didn't notice it when I did mine. I can't remember exactly how long it said it could take, but it seems like a few warmup/driving cycles must be gone through for any learning to take place. Is your charge meter in your dash working properly? Like is it reading 13-14v? Have you checked your transmission fluid?
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Mountain Pass
Joined: Mar 2004
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I don't know how many volts it is registering because those aren't indicated on the gauge, but the gauge is in the upper half of the scale (the neadle is right on the upper tip of the picture of the battery on the gauge). I can turn on the headlights, interior lights, front and rear AC and the volt gauge doesn't move. The trany fluid looks and smells good.
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Mountain Pass
Joined: Mar 2004
Posts: 127
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OK, here's an update. It turns out that my hard shifting and RPM issue were both the result of an inoperable mass air sensor. When I removed the breather to get to the alternator I pulled one of the wire our of the mass air sensor plug. after finding it and putting the plug back in the truck ran better than it has in years.
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