92 Camry 4cyl hesitates

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Old 04 Apr 2004, 04:05 am   #1 (permalink)
Dan Bassett
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Default 92 Camry 4cyl hesitates

After the car has gotten out of it's cold start high idle routine, the car
will start to hesitate. It's not constant though. Here is the best way
that I can describe it. At idle, in Neutral or in gear the car will all of
a sudden drop rpm and the computer seems to compensate for it right away by
revving it a bit, then it returns to normal. This sometimes repeats 2 or 3
times in a row pretty rapidly and then it's fine for the next 30 seconds to
a minute then repeats. So it seems like the car is hiccuping or something.
Prior to a few weeks ago, this problem presented itself only at idle.
Accelerating and at speed were fine. Then, it started affecting
acceleratoin once in awhile in that the car would bog down when accelerating
from a stop, but not all the time. One time it sounded like it back-fired
when it bogged down. So I changed the spark-plugs and the bogging down seem
to have disappeared for awhile, but the hesitation I described earlier still
remains. The spark plug tips were very light brown in color. I just did
the rotor as well. I kept the old distributor cap cause it was pretty new,
but the problem still exists. I didn't do the wires because they are only
about 5,000 miles old, if that. The distributor had been replaced about 10
to 15,000 miles ago so I didn't think it could be that. I also replaced the
fuel filter, but still no luck.

The car has an automatic and has 180,000 miles on it. The problem does not
seem to be affected by weather.

Could it be the fuel pump? Wouldn't that tend to go completely dead though?
Any help would be appreciated.

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