Hesitation at 2k RPM
09-26-2014, 02:58 PM
#1
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Hesitation at 2k RPM Hi everyone,
I have a camaro ss 01 completely stock (expect the shifter) with 180k miles.
General:
- changed the TPS
- changed the battery after the car didn't want to start (the old battery doesn't seem to be completely dead though, maybe alt problem?).
- cleaned the MAF
- the T56 transmission is very noisy, no grinds and all the gears work
- Sometimes I struggle inserting the first gear when I stop (maybe clutch problem?)
Situation:
- sitting in traffic or driving slowly <35mph for ~10 minutes
Problems (I don't know if they are correlated between each other):
- when accelerating with ~10% throttle the car hesitate at about 2k RPM
- when idling every ~5min the engine hesitates (it goes to 400RPM and then back to 800RPM)
- the battery voltage drop slightly to ~13.7V instead of the normal ~14.1V
Is the alt dying? Or do you have an idea of what could be the problem?
Thanks
I have a camaro ss 01 completely stock (expect the shifter) with 180k miles.
General:
- changed the TPS
- changed the battery after the car didn't want to start (the old battery doesn't seem to be completely dead though, maybe alt problem?).
- cleaned the MAF
- the T56 transmission is very noisy, no grinds and all the gears work
- Sometimes I struggle inserting the first gear when I stop (maybe clutch problem?)
Situation:
- sitting in traffic or driving slowly <35mph for ~10 minutes
Problems (I don't know if they are correlated between each other):
- when accelerating with ~10% throttle the car hesitate at about 2k RPM
- when idling every ~5min the engine hesitates (it goes to 400RPM and then back to 800RPM)
- the battery voltage drop slightly to ~13.7V instead of the normal ~14.1V
Is the alt dying? Or do you have an idea of what could be the problem?
Thanks
Last edited by DJFlash; 09-26-2014 at 07:51 PM.
09-26-2014, 07:53 PM
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09-28-2014, 12:34 PM
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Not voting for this cause, but IAC shouldn't be ruled out just because the issue is not always at idle. If the IAC is opening unexpectedly at 2KRPM this would be letting in too much air. Worth cleaning to make sure it can operate properly.
Last edited by Mercier; 09-28-2014 at 01:16 PM.
09-29-2014, 03:21 PM
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I have a bluetooth obd2 read and torque pro. What is the best way to diagnose the problem?
I didn't see the current misfire count goes up while having the hesitation.
09-30-2014, 01:53 PM
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Clean maf. How old are the O2 sensors? How old is the fuel filter? Maybe do the seafoam treat ment. Can you scan gauge read O2 readings if so how are they fluctuating fast or slow?
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10-01-2014, 11:17 AM
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No I have the stock LS6.
I run some test yesterday with torque:
I run some test yesterday with torque:
Code:
Mode $06 report generated by Torque for Android ================================================ Vehicle VIN: Not present Vehicle Manufacturer: Unknown Vehicle Calibration ID: Not present Unit and scaling information are not supplied with the data from the ECU for this type of vehicle. Consulting the manufacturers service book for this information is recommended. Test report: ------------------ TID:$02 CID:$04 - Lean to Rich sensor threshold voltage(constant) Test incomplete or dependant test failed -- TID:$02 CID:$06 - Lean to Rich sensor threshold voltage(constant) Min: 32,868 Test result value: 32,868 PASS ---- TID:$02 CID:$11 - Lean to Rich sensor threshold voltage(constant) Min: 375 Test result value: 376 PASS ---- TID:$02 CID:$30 - Lean to Rich sensor threshold voltage(constant) Test incomplete or dependant test failed -- TID:$02 CID:$40 - Lean to Rich sensor threshold voltage(constant) Test incomplete or dependant test failed -- TID:$02 CID:$50 - Lean to Rich sensor threshold voltage(constant) Min: 32,858 Test result value: 32,858 PASS ---- TID:$02 CID:$52 - Lean to Rich sensor threshold voltage(constant) Max: 32,768 Test result value: 32,768 PASS ---- TID:$02 CID:$60 - Lean to Rich sensor threshold voltage(constant) Max: 32,948 Test result value: 32,776 PASS ---- TID:$02 CID:$66 - Lean to Rich sensor threshold voltage(constant) Max: 32,838 Test result value: 32,770 PASS ---- TID:$02 CID:$71 - Lean to Rich sensor threshold voltage(constant) Max: 32,888 Test result value: 32,767 PASS ---- TID:$05 CID:$0a - Rich to Lean sensor switch time(calculated) Max: 1,450 Test result value: 303 PASS ---- TID:$05 CID:$4a - Rich to Lean sensor switch time(calculated) Max: 1,450 Test result value: 356 PASS ---- TID:$06 CID:$35 - Lean to Rich sensor switch time(calculated) Max: 66 Test result value: 31 PASS ---- TID:$06 CID:$41 - Lean to Rich sensor switch time(calculated) Max: 92 Test result value: 35 PASS ---- TID:$06 CID:$55 - Lean to Rich sensor switch time(calculated) Max: 72 Test result value: 24 PASS ---- TID:$06 CID:$61 - Lean to Rich sensor switch time(calculated) Max: 81 Test result value: 39 PASS ---- TID:$0c CID:$60 - Misfire counts for last/current driving cycles(calculated) Max: 33,175 Test result value: 32,273 PASS ---- TID:$0c CID:$70 - Misfire counts for last/current driving cycles(calculated) Max: 33,070 Test result value: 27,081 PASS ---- End of report.
10-01-2014, 11:19 AM
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I don't know how old the o2 sensors/fuel filter are. I have just bought the car.
10-01-2014, 01:28 PM
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This is at idle after ~20min
idle ~25min
Idle ~25min
3000 RPM ~25min
weird stuff at idle ~30min (after revving up a bit)
weird stuff at idle ~30min (after revving up a bit)
weird stuff at idle ~30min (after revving up a bit)
weird stuff at idle ~30min (after revving up a bit)