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2009 Forester XT
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121 Posts
Discussion Starter #1
On a recent road trip to Oregon this month I noticed a slight surging in the engine speed while the cruise control was on on and the car was pulling a grade. 2009 Fozzie XT.

It does not happen when it is not locked on cruise control, nor does it happen with cruise control on level routes. This leads me to believe my problem is in the cruise control itself. I can feel the surge, hear it, and see it on the tach. It is not radical, but is annoying. It surges about 50 to 100 rpms, back and forth.

Anyone else have this problem? Can Subaru fine tune these things to eliminate it?
 

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2009 Forester 2.5x
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76 Posts
Yeah, I noticed it today aswell. But I live in the prairies, its as flat as can be. I set the cruise and few minutes later a fell like a little kick, I thought it was due to the wind, but notice it again and again. I watched the RPM and notice it does move ever so slightly. I took cruise off and no problem. It must be a ecu issue. I'll talk to dealer tommorrow. I thought I was going crazy.
 

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2009 Forester XT
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121 Posts
Discussion Starter #3
I was beginning to think no one else had the problem or even saw the post.
 

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07 FXT sport
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1,736 Posts
Do either of you have boost gauges?? Is it boost oscillation that you are feeling??

dm
 

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2009 Forester XT
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121 Posts
Discussion Starter #6
Do either of you have boost gauges?? Is it boost oscillation that you are feeling??

dm
No on the gauge. Have no clue if it boost oscillation. My first turbo-ed car.
 

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07 FXT sport
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Of course if it's under warranty get it checked out by the stealers.

I'd recommend checking for some locals who might let you borrow a tactrix cable or log for you your vehicles. You might be able to capture the data during what your feeling.

It might help track down what's occuring. Maybe it's just in the programming of the cruise control and not something that can be modified.

Good Luck

dm
 

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2009 Forester XT
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121 Posts
Discussion Starter #8
Of course if it's under warranty get it checked out by the stealers.

I'd recommend checking for some locals who might let you borrow a tactrix cable or log for you your vehicles. You might be able to capture the data during what your feeling.

It might help track down what's occuring. Maybe it's just in the programming of the cruise control and not something that can be modified.

Good Luck

dm
I am betting on the cruise control being the culprit. Why? When I turn it off the symptoms disappear. It ONLY happens on grades.
 

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2009 Forester 2.5x
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76 Posts
I made a appointmwnt with the dealership next week. I hope they can get to the root of the issue, anyways thanks DM for your input. I hope Mike you can get those issues delt with as well. I'll keep you posted.
 

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2009 Forester 2.5x
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76 Posts
Took it in to the dealer. They tried to replicate the issue, but couldn't. They checked the ECU and nothing came up, so who knows. I have to keep on monitoring the issue. Take care

Alan
 

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2014 Forester XT Premium CVT
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64 Posts
Mine does this also. It only does it on very steep uhill, and while the torque converter is not locked in forth gear. It does it as it starts to build boost, then rolls off the throttle quickly to compensate. I did not think anything of it, my automatic turbo talon acted similar. I just thought it was normall.
 

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2004 STi Forester
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6 Posts
Hey Guys, I hope you can help me with this.

Now, I dont have an auto and no cruise control, BUT, I do have "the surge". It occured anywhere from 2100 to 3000 rpm, worse at 2400 rpm, BUT, only at VERY small throttle or on the over-run.

I first noticed this 18 months ago, but only when starting from cold, and it didnt seem important, but it has steadily got worse.

I took scooby to a respected Subaru specialist, from whom I originally bought the car, and they said nothing showed up, and suggested changing the air flow meter. That done, the car is smoother overall, but the fault is getting worse. The surging now occurs from 1800 to 3800 revs, still on almost closed throttle only as before.

Now this seems to me to be a throttle position related fault, can anyone point me in the right direction to cure it ??.

Please !!.

VBR Chris Adams.

ps: the car is a 2004 Forester Sti. ( 2.5L Turbo, Japan and New Zealand model ).
 
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