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Hesitation? Look Here First!:
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Old 08-08-2007, 07:02 AM   #1
Drakuun
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Arrow Hesitation? Look Here First!:

I've created this thread to highlight the most common fixes for any sort of 'Hesitation' issues commonly encountered with our Subarus. It seems many of us experience hesitation at some point in time and usually all for the same reasons.

Hesitation in this thread is defined as , but is not limited to : Throttle lag , Stumbling, and Bogging while the Engine is 'Under load'.


This hesitation may, or may not throw a CEL code. Most times, the hesitation is our 'early warning' of a part that is on it's way to failing,
and in a large majority of instances, no CEL's are thrown.

If you do get a CEL code, you can get them read at most auto parts stores.
(Auto Zone seems to be the popular choice.) Once you have a code, you can reference it here CEL Code Listing



**I have not arranged these 'solutions' in any particular order.**

Also : Most of these solutions will remedy hesitation problems at IDLE as well.


Common fixes for hesitation issues.

Oxygen Sensors

PCV Valve

Coil Pack (non-turbo)
Coil Packs (for turboed cars)

Spark Plugs

Spark Plug Wires (non-turbo)

Valve cover gaskets & Spark plug tube gaskets (Do this if you find ANY OIL AT ALL on your Plug wire ends, or spark plugs or, if you see oil in the plug tube.)

Dirty Injectors (seafoam cleaner)

Dirty Throttle Body (seafoam cleaner)

Dirty Electrical contacts on MAF or MAP sensors (Simply use Electric contact cleaner on the contacts. Do any you can find really,
it's not bad for them.)

Dirty or failing MAF or MAP sensors

Blocked, Clogged, or 'on its way to failing' Catalytic Converter

Coolant temperature sensor

And occasionally : Bad Gas

Also commonly suggested, is improving the Grounding under the hood.

The following are common sensors that fail in regards to the transmission ; causing hesitation problems, as outlined above.

TCM
Throttle position sensor
2-4 brake duty solenoid
ATF temperature sensor
Line pressure duty solenoid
Control valve
2-4 brake
2-4 brake timing solenoid
Speed Sensor
Lock up Clutch (4eat)
Tourque Converter (4eat)
Valve Body (not sure how it works or fails, but can cause issues)
Failing Clutch's
Gears
Clutch packs
Failing Differentials

______________________________ _________________

I will continue to update this thread as more information gets posted by you, the reader, or as new solutions to hesitation issues are found.
The somewhat sad irony of this thread is, I'm currently troubleshooting my own 'hesitation' issues, at this point, to no avail. My hope is that through my reasonable diligence, that others don't have to go through all these steps as I have.

If you have a solution to hesitation that you do not see posted, please post and I will add it. If you have links to DIY threads, or any other technical resources that relate, please post them and I will add them.

Thanks everyone! And Good Luck on clearing up your hesitation issues!

Last edited by James555; 09-18-2017 at 02:08 AM..
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Old 08-08-2007, 07:04 AM   #2
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Good stuff
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Old 08-29-2007, 09:14 PM   #3
irizzi
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I am having hesitation problems and idol problems in my 98 2.5. I beileve it is the throttle position sensor but i'm not sure. is there any way to check? (besides diagnostics.) I also read that when installing a throttle position sensor you need to adjust it to idol correctly, is this true?
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Old 09-14-2007, 10:29 AM   #4
spinninhye
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I have kind of a wierd problem, and I'm having trouble determining if it's normal operation or not. I have an 00 rs with 120k miles on it. The problem really only happens in second gear. If I'm driving at 2krpm or higher, and release the gas pedal and let the rpms drop, ever single time it hits 1500rpm the car starts rocking back and forth, or bogging. after it drops below 1500 it stops. I originally thought that the car's just not meant to drop to that low rpm but the bogging is pretty excessive. No CEL currently. Any ideas?
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Old 09-14-2007, 10:58 AM   #5
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sticky
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Old 09-14-2007, 11:12 AM   #6
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Knock sensor? Cause the last time that happened my car ran like ass...
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Old 09-14-2007, 11:47 AM   #7
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Not that I want to discourage you folks, but this is a sticky post.. not really the place to ask for advice or help troubleshooting your problems. They'd be better served, and better seen if you make your own post about your issue in this forum.

I appreciate the bumps, and thanks for reading! And please if you find a cure for your issue, please then post here and let me know what the solution was so I can cross reference them with our compiled list and add your solutions if we don't have them already.

Thanks guys! Good Luck!
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Old 10-16-2007, 07:37 AM   #8
kainam00
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Quote:
Originally Posted by kmltick View Post
Knock sensor? Cause the last time that happened my car ran like ass...
+1 This is a very common cause for hesitation in our cars.
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Old 10-16-2007, 09:35 AM   #9
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coolant temp sensor.
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Old 10-16-2007, 10:47 AM   #10
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Good Looking out Jnorth!

Thanks.
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