Throttle tip-in issue/stumble (3.0 5-speed)

[workingonit]

I forgot to mention this in my previous post (#40) in this thread: I have the same throttle delay that seems common to the M54B30 engine, too.

Having never driven ANY BWW previously, I just assumed that it was normal for the species, and have lived with it as-is. It doesn't bother me much, since I mentally & physically delay throttle application while leaving a stoplight, after being a long-time drag racer, and now refrain from full throttle starts (less wear and tear on the old parts).

I've also found that on my other drive-by-wire vehicles (both GM products: a '04 Chevy 2500HD pickup, and a '09 Chevy HHR Panel), they will sometimes go into limp mode if I tromp on the pedal from idle, so I learned to ease into it, to avoid the problem. The '98 GMC pickup, with a conventional mechanical accelerator installed, has no such a limitation (in fact, the previous owner, a friend I bought it from, previously won many drag races driving it).

Now, following this thread, and with the tip-in delay in mind, I did one lead-footed start yesterday while driving the X5. While it didn't compare well to either the GMC, nor to the memory of my 700+HP '66 Chevelle drag racer, it did leap from the light. I think I'll keep a lighter foot, and my intentional delay when accelerating from idle, and restrict full throttle applications to the highway (it shows no tip-in delay there).

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