1999 Buick Regal Shifting problems

FOSTERCHILD

MEMBER
1999 BUICK REGAL
6 CYL
2WD
AUTOMATIC
111,520 MILES

I recently purchased a 99 regal non supercharge. I had problems with the transmission intially it didnt go directly into reverse and eventually it would jerk every time it shifted gears and it seemed to hold gears during downshifting. I had a the tranny replaced with a used tranny. Im still having the same problems. When I get to speeds above 50 the tach seems to bounce a little with my foot off of the gas. Ive also been receiving codes p0449, p0102, and p0445. I swapped out the maf with my brothers who also has a 3.8l and the code still pops up and he recieves no code at all. Im at a stand still. Any help would be appreciated

1 Reply

FACTORYJACK

MECHANIC
4,159 POSTS

Not finding a hit on a code P0445, are you sure that is correct? First thing to check, and it can relate to P0102 MAF low frequency, and P0449 evap vent solenoid control circuit, is that they share a common power supply. The ENG EMIS 10a fuse in the underhood fuse block is the source, check that this fuse is good, and that there is power at it, you can do this with a test light, or volt meter. If this fuse is popped, it could be as little as a faulty solenoid, or shorting in the underhood wiring. Also, you may replace this fuse, and it may work fine. That would indicate the possibility that the problem is intermittent, and you may just have to drive. If that is the case, pay attention to any pertinent conditions, in an effort to isolate it, or create a pattern to duplicate the concern. It can run without a MAF sensor, it just substitutes a value, this can also affect your shifting, but not necessarily the reverse engagement issue.