2003 Camry XLE V6 Acting Up
I have a 2003 Camry XLE V6 (pre-VVTI) w/4-speed automatic (pre 5-speed). Have owned it since late fall 2010, bought it with 118,000 miles on it, now has 131,000 miles.
Just recently, I have noted a minor problem developing. It happens only after the engine is fully warmed up. No check engine light on, no pending codes either. It idles fine, drives fine. But, after a warm engine startup, when pulling away from a stop with very light throttle, there is a hesitation that is fairly noticeable. Give it a little more gas, and the acceleration is smooth. Also, when on the highway, drives great, except when the engine is lightly loaded (such as going down a slightly sloping hill). Then the hesitation presents itself again. On a steep decline, on a flat road, or anything uphill, everything is great. Doesn't make any difference if the climate control is on or off, headlights on or off, etc.
Anyone experience this before? If so, anyone know what might be the cause of the problem?
I put the scanner on while the engine was idling in the driveway, after it had been driven for a bit (I couldn't do a freeze frame because my scanner is at home but my PC is in California, so I can't link up). I'm not even sure it is an engine issue - could be transmission related, but not likely (transmission fluid is where it should be when hot and engine idling). Air temperature was 65 deg F. Here is what the scanner provided:
Fuel Sys 1: CL
Fuel Sys 2: CL
Calc Load (%): 12.9
ECT (deg F): 194
STFT B1 (%): 1.5
LTFT B1 (%): -5.4
STFT B2 (%): 0.0
LTFT B2 (%): 3.1
Eng RPM: 590
Veh Speed (MPH): 0
Spark Adv (deg): 20
IAT (deg F): 114
MAF (lb/min): 0.306
TPS (%): 15.2
O2S B1 S2 (V): 0.740
STFT B1 S2 (%): NA
O2S B2 S2 (V): 0.680
STFT B2 S2 (%): NA
OBD Sup: OBD2
O2S B1 S1 (V): 3.298
EQ Ratio 11: 1.000
O2S B2 S1 (V): 3.277
EQ Ratio 21: 1.000
The IAT is a bit high compared to ambient air temp, but the hood was closed and it had been idling for some time, so the IAT likely was picking up a lot of engine heat. On the highway when driving, the IAT went down to the high 70's (still about 10-15 deg F higher than ambient).
The ECT was also a bit high at 194 deg F, but when driving on the highway, it went down to 180 deg F.
The LTFT's for B1 & B2 seemed off compared to each other. When on the highway, these two values seemed pretty close. But when idling in the driveway, they kept pulling away from each other. Could this be a clue?
Anyway, if anyone has ever experienced this and knows what the source problem likely is, and what can be checked to verify the source of the problem, I would very much want your response.
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