When I'm at highway speeds (60+) and try and maintain a constant speed, sometimes I get intermittent hesitation blips. Very subtle and only for a fraction of a second, after which life continues as though nothing happened. If it only happened a couple times, you might discount it as a wind change that zapped a bit of your power. I don't have any issues with acceleration.
It's been going on for a long time, so it's hard to say exact when it started. Today it was repeatedly doing it enough that I'm confident that something is causing it. It was over 85* out, which caused me to run a little above 210*. Could it be temp related?
Fuel system was my first thought, but I replaced my fuel pump 15k miles ago. I had a lot of problems with vapor locking last summer. Could have shorted it's life? While chasing that I cleaned/inspected my injectors.
Ignition system? In the last 10k miles I've replaced the plugs, wires, dist cap, and rotor.
Is there anything that could be physically binding up? I'd expect to hear something when it let go, like a thunk or pop.
Clean throttle body.
Check air filter.
Run a tank with injector cleaner.
Rent a tester to check fuel pressure.
Use a code reader with live data to check TPS, MAP.
Clean the contacts on your cap and rotor.
Which plugs did you use?
Those would be the cheap things I'd start with since you already took care of plugs, etc.
TB & air filter look good. I've already run injector cleaner through a couple times. I'll check the fuel pressure later. Surely the cap and rotor shouldn't be that dirty after only 10k miles?
I have an OBD reader. Can you say more about the correct behavior of the TPS and MAP sensors? Attached are logs of the O2 sensors while idling. They are a little quirky. Are they ok? Both are less than 10k mile old, but they are from Autozone so who knows...
I also ran a OBD Mode $06 test. TIDs $13, $19, $1A, $1C, and $35 all failed. They are all O2 sensor related (though it doesn't seem to clearly tell me which sensor). What kind of crap O2 sensor dies in less than 10k miles?
So consensus is that if it's an O2 sensor, it's the upstream. I found a local place with NGKs, so I guess I'll give that a go and let you guys know how it goes.
Replaced the upstream sensor with an NGK one. Took it for a test spin and the hesitation seems to be gone!!!!! :smile2:
I don't have any fault codes in the OBD, but the detailed "Mode $06" test in Torque still includes failures. :frown2: Below is the report, cross-referencing with the Chrysler code definition.
Thoughts? I've read someone say that Mode $06 can be a wild goose chase.
Mode $06 report generated by Torque for Android
================================================
Test report:
------------------
TID:$11 CID:$01 (O2 Sensor 1/1 Half-cycle Counter. Units: 1 count/bit)
-
Max: 56. Test result value: 11. PASS
----
TID:$13 CID:$01 (O2 Sensor 1/1 Full-cycle Counter. Units: 1 count/bit)
Max: 48. Test result value: 255. FAIL
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TID:$19 CID:$01 (O2 Heater 1/1 Time to Reach Voltage. Units: 11ms/bit)
Min: 3,693. Test result value: 2,022. FAIL
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TID:$1a CID:$01 (O2 Heater 1/2 Time to Reach Voltage. Units: 11ms/bit)
Min: 15,360. Test result value: 2,236. FAIL
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TID:$1c CID:$01 (O2 Heater 1/3 Time to Reach Voltage. Units: 11ms/bit)
Min: 15,360. Test result value: 2,236. FAIL
----
TID:$35 CID:$01 (Catalyst Slow O2 2/1 Response Counter)
Max: 16. Test result value: 128. FAIL
----
End of report.
I wouldn't worry about that test result if you aren't experiencing any symptoms or getting a MIL or and codes. Torque can be a little twitchy with some of those tests on Chrysler vehicles from my experience.
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