U
Uncle Ben
Twice in the last two weeks of daily driving here at 5-25 deg F, my
1999 OB showed the above symptoms. Next morning, normal behavior!
The first time, the shifting problem came on gradually -- after 5
minutes or so of driving. I thought for a minute or so that I was
running out of gas. The second time, a week later, it came on fully
within 30 seconds of starting. It is as if the AT is refusing to up-
shift until it finally engages with a "THUNK" and a jolt. Shifts down
again with a jolt.
Does not recover during further driving. Overnight cool-down did fix
it both times.
Checked fluids. AT oil OK.
The computer code (according to AutoZone) was something about manifold
pressure. I had them erase the code the first time. Now, after second
episode, it is still in memory, and I can go back and get the exact
code if it will help.
The second time was four days ago. Today, behavior is completely
normal. Until the shifting symptoms come back and stay, there is not
much point in going for service, ("Nothing wrong, $40 please.") But
does anyone recognize these symptoms?
1999 OB showed the above symptoms. Next morning, normal behavior!
The first time, the shifting problem came on gradually -- after 5
minutes or so of driving. I thought for a minute or so that I was
running out of gas. The second time, a week later, it came on fully
within 30 seconds of starting. It is as if the AT is refusing to up-
shift until it finally engages with a "THUNK" and a jolt. Shifts down
again with a jolt.
Does not recover during further driving. Overnight cool-down did fix
it both times.
Checked fluids. AT oil OK.
The computer code (according to AutoZone) was something about manifold
pressure. I had them erase the code the first time. Now, after second
episode, it is still in memory, and I can go back and get the exact
code if it will help.
The second time was four days ago. Today, behavior is completely
normal. Until the shifting symptoms come back and stay, there is not
much point in going for service, ("Nothing wrong, $40 please.") But
does anyone recognize these symptoms?