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Registered
2007 Outback XT
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15 Posts
Discussion Starter #1
replaced turbo, rpm bouncing, hesitation

VIDEO HERE - start around 2:09
2007 Outback XT Engine Hesitation/Bouncing - YouTube

I have a 2007 Outback XT, 120k miles, completely stock
Turbo went out on me last week so I had it replaced
Replaced the timing belt, front O2 Sensor, and battery
Also had my 120k checkup which included changing out all fluids and spark plugs

When I am WOT in 3rd/4th, at around 3000rpm the engine will start revving around +-300rpm a few times.
It is somewhat noticeable in 2nd but I haven't tested it that much yet.

To explain it better... say I am at 3000, then it goes up to 3300, then all the way down to 2700, then back up to 3300, then back down to 2700, then it may do it again or it may be fine and go up past 3300.

The numbers I gave are just approximates, doesn't almost happen right at 3000 and it's not always +-300. But it is definitely noticeable.

Do I need time for the ECU to reset itself or could it be something more serious?
 

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2007 Outback XT
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15 Posts
Discussion Starter #2
Here is a sensor check from the Torque app
Seems like "O2 Bank 4 Sensor 3" and "O2 Heater Monitor Bank 4 - Sensor 4" are failing... great

Does anyone know what exactly those control and if those could be causing my issues?

There are no error codes.. yet


Test report:
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MID:$01 TID:$81
- O2 Bank 1 Sensor 1
Max: 3.79993V Min: 1.79999V
Test result value: 2.79295V
PASS
----
MID:$01 TID:$82
- O2 Bank 1 Sensor 1
Max: 9.99609mA Min: -9.99609mA
Test result value: 0mA
PASS
----
MID:$01 TID:$83
- O2 Bank 1 Sensor 1
Max: 500Ohm Min: 0Ohm
Test result value: 31Ohm
PASS
----
MID:$01 TID:$84
- O2 Bank 1 Sensor 1
Test incomplete or dependant test failed
--
MID:$01 TID:$85
- O2 Bank 1 Sensor 1
Max: 1.15lambda Min: 0lambda
Test result value: 0.97878lambda
PASS
----
MID:$01 TID:$86
- O2 Bank 1 Sensor 1
Test incomplete or dependant test failed
--
MID:$02 TID:$05
Rich to Lean sensor switch time(calculated) - O2 Bank 1 Sensor 2
Max: 832ms Min: 0ms
Test result value: 672ms
PASS
----
MID:$02 TID:$06
Lean to Rich sensor switch time(calculated) - O2 Bank 1 Sensor 2
Max: 2,016ms Min: 0ms
Test result value: 160ms
PASS
----
MID:$02 TID:$07
Minimum sensor Voltage for test cycle(calculated) - O2 Bank 1 Sensor 2
Max: 0.15V Min: 0V
Test result value: 0.146V
PASS
----
MID:$02 TID:$08
Maximum sensor Voltage for test cycle(calculated) - O2 Bank 1 Sensor 2
Max: 65.535V Min: 0.55V
Test result value: 0.552V
PASS
----
MID:$02 TID:$87
- O2 Bank 1 Sensor 2
Max: 65.535V Min: 0.03V
Test result value: 0.645V
PASS
----
MID:$02 TID:$88
- O2 Bank 1 Sensor 2
Max: 1.2V Min: 0V
Test result value: 0.645V
PASS
----
MID:$0f TID:$60
- O2 Bank 4 Sensor 3
Max: 16,385ms Min: 6,193ms
Test result value: 40,944ms
FAIL
----
MID:$21 TID:$89
- Catalyst Monitor Bank 1
Test incomplete or dependant test failed
--
MID:$39 TID:$93
-
Test incomplete or dependant test failed
--
MID:$3b TID:$94
- EVAP Monitor (0.090")
Test incomplete or dependant test failed
--
MID:$3b TID:$95
- EVAP Monitor (0.090")
Test incomplete or dependant test failed
--
MID:$3c TID:$96
- EVAP Monitor (0.040")
Test incomplete or dependant test failed
--
MID:$3c TID:$97
- EVAP Monitor (0.040")
Test incomplete or dependant test failed
--
MID:$3d TID:$98
- EVAP Monitor (0.020")
Test incomplete or dependant test failed
--
MID:$41 TID:$99
- O2 Heater Monitor Bank 1 - Sensor 1
Max: 250Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$41 TID:$9a
- O2 Heater Monitor Bank 1 - Sensor 1
Max: 500Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$41 TID:$9b
- O2 Heater Monitor Bank 1 - Sensor 1
Max: 50Ohm Min: 0Ohm
Test result value: 31Ohm
PASS
----
MID:$42 TID:$9c
- O2 Heater Monitor Bank 1 - Sensor 2
Max: 320Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$42 TID:$9d
- O2 Heater Monitor Bank 1 - Sensor 2
Max: 320Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$50 TID:$01
Rich to Lean sensor threshold voltage(constant) - O2 Heater Monitor Bank 4 - Sensor 4
Max: 45,096 Min: 10,368
Test result value: 65,520
FAIL
----
MID:$71 TID:$9e
- Secondary Air Monitor 1
Max: 106.12kPa Min: 0kPa
Test result value: 99.49kPa
PASS
----
MID:$71 TID:$9f
- Secondary Air Monitor 1
Max: 5V Min: 0V
Test result value: 0.029V
PASS
----
MID:$71 TID:$a1
- Secondary Air Monitor 1
Max: 0.05V Min: 0V
Test result value: 0.005V
PASS
----
MID:$71 TID:$b0
- Secondary Air Monitor 1
Test incomplete or dependant test failed
--
MID:$71 TID:$b3
- Secondary Air Monitor 1
Test incomplete or dependant test failed
--
MID:$71 TID:$b4
- Secondary Air Monitor 1
Test incomplete or dependant test failed
--
MID:$71 TID:$b5
- Secondary Air Monitor 1
Test incomplete or dependant test failed
--
MID:$a1 TID:$0b
EWMA Misfire counts (average) for last 10 drive cycles - Misfire Monitor General Data
Max: 65,535Count Min: 0Count
Test result value: 2Count
PASS
----
MID:$a1 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Monitor General Data
Max: 65,535Count Min: 0Count
Test result value: 17Count
PASS
----
MID:$a2 TID:$0b
EWMA Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 1 Data
Max: 65,535Count Min: 0Count
Test result value: 1Count
PASS
----
MID:$a2 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 1 Data
Max: 65,535Count Min: 0Count
Test result value: 6Count
PASS
----
MID:$a3 TID:$0b
EWMA Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 2 Data
Max: 65,535Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$a3 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 2 Data
Max: 65,535Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$a4 TID:$0b
EWMA Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 3 Data
Max: 65,535Count Min: 0Count
Test result value: 1Count
PASS
----
MID:$a4 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 3 Data
Max: 65,535Count Min: 0Count
Test result value: 11Count
PASS
----
MID:$a5 TID:$0b
EWMA Misfire counts (average) for last 10 drive cycles - Misfire Cylinder 4 Data
Max: 65,535Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$a5 TID:$0c
Misfire counts for last/current driving cycles(calculated) - Misfire Cylinder 4 Data
Max: 65,535Count Min: 0Count
Test result value: 0Count
PASS
----
MID:$d3 TID:$9a
-
Max: 532.47998g/s Min: 61.84g/s
Test result value: 396g/s
PASS
----
MID:$e1 TID:$a6
Manufacturer defined MID -
Test incomplete or dependant test failed
--
 

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Lawn ornament XT
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14,366 Posts
You don't have a bank 4. That may be a legit readout of some other sensor on the car, but no way is it an emissions probe in cylinder bank 4. You might need to get with the torque support folks to find out what sensor it is polling. I know torque allows custom PIDs but I don't know how to assign them or what the default map might be.

Ignore the fact that it says fail, because it isn't even identifying the sensor correctly- so it would be impossible to know what criteria to test it with.

Is the car surging or is the tach your only indication of rpm instability?

The 'usual' problem is somebody leaving one of the many air or vacuum hoses loose. Have you had it back to the shop so they can see it?
 

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2007 Outback XT
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15 Posts
Discussion Starter #4
I just got it back from the shop today. I might be back there tomorrow...

I can hear and feel the car surging.
So basically I start accelerating fine, then there is a hesitation for a good 5 seconds while the rpms are bouncing around, it is a jerking feeling, then it starts accelerating again.

Any idea if I just have to wait for the ECU to relearn things or should I get this back to the shop and have them check for leaks?
 

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2007 Outback XT
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15 Posts
Discussion Starter #5
Just added a video link to the first post
Very limited testing on my short drive to work this morning.
Yes I let the car warm up first.

In 3rd gear it seemed to only hesitate once.
4th and 5th it is very noticeable around 2:09, 2:29, 3:21, 3:54 in the video.

2:50 - 3:00 you can ignore, I think that was me just letting off the gas because there was a car in the way
 

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'14 3.6R Outback
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2,345 Posts
Thanks for the vid.

I totally guessing here but it almost seems like it's starving for air.

My best guess is the shop did not hook something up right. It's weird it's not throwing a code, it really should.
 

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2007 Outback XT
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15 Posts
Discussion Starter #7
At the dealership now.. This better get fixed tonight! I won't stand having another forester rental.
 

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6 Posts
2005 Outback 2.5 XT

Hey guys,

I saw that this was about RPMs and had to ask a question. I recently bought a 2005 outback XT with about 80k miles on it. Recently i have been noticing a rather loud rattle at an idle, however, this rattle only happens when the car is in Drive or Reverse. (The Car is automatic, although, i wish it was an m/t) I tried to figure out what was going on today by pulling the handbrake while the car was in drive and listening to the rattle. When i apply just a small amount of gas the rattling stops. It seems like by raising the idle of the car by just 5 rpms, i could fix the problem. Have any of you had this problem? I would really appreciate some help as a new Suby owner.

Thanks


Jack
 

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Registered
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22,836 Posts
Hey guys,

I saw that this was about RPMs and had to ask a question. I recently bought a 2005 outback XT with about 80k miles on it. Recently i have been noticing a rather loud rattle at an idle, however, this rattle only happens when the car is in Drive or Reverse. (The Car is automatic, although, i wish it was an m/t) I tried to figure out what was going on today by pulling the handbrake while the car was in drive and listening to the rattle. When i apply just a small amount of gas the rattling stops. It seems like by raising the idle of the car by just 5 rpms, i could fix the problem. Have any of you had this problem? I would really appreciate some help as a new Suby owner.

Thanks


Jack
Loose heat shield or aftermarket axles both are known for causing this.
 

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Lawn ornament XT
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14,366 Posts
Hose clamps have been known to work great. It's not a weird or rare rattle on subarus and the usual anti-rattle methods work.
 

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2007 Outback XT
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15 Posts
Discussion Starter #14
so my car is spending the night at the dealership... they couldn't figure it out right away and need to check more things

and since I'm only 23 the only model they would let me rent is the forester :(
 

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2007 Outback XT
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15 Posts
Discussion Starter #15
they fixed it by flashing the ECU to the latest update they had, then when through the process of having the ECU and transmissions relearn things. now it is driving great.

the service person that worked on my car today says that after the turbo, timing belt, and fluids were replaced, that most likely those things were not relearned and that they needed to be.
 
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