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Subaru B9 Tribeca Transmisson Issues

70 messages,  Last post on Nov 18, 2009 at 4:20 PM

You are in the Subaru B9 Tribeca Maintenance & Repair Forum. Your Host is kcram

What is this discussion about? Subaru B9 Tribeca, Transmission, SUV


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#19 of 70
Re: Lost power [mikejl] by mikejl
Sep 11, 2007 (7:25 am)
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Replying to: mikejl (Oct 31, 2006 12:17 pm)

It has been a while, but I just had another episode, similar to the first. Highway driving, 70-75 mph, the car suddenly started slowing down and did not respond to any attempt to accelerate.
 
I again worked my way off the road and put the transmission in Park. I then put it back in gear and drove off with no problem.
 
This time, I was more observant and I have a feeling both episodes were caused by a nearly-empty gas tank.
 
On this new occurrence, my low gas indicator was definitely on. I am pretty sure the indicator was on when it happened before, too. I did not run out of gas either time - I have never put more than 14 gallons in, ever - but I just have this feeling that the computer chip in the car may have gotten some signal that we had, indeed, done just that.
 
That would explain why there was no response from the accelerator. Stopping the car from highway speed may have moved the gas around in the tank enough to reset any switch or indicator that had signaled an empty tank.
 
This is just a theory, but I think I'm going to try to stop for gas sooner when I'm on a trip from now on, just in case.
 
BTW - I have 61,500 miles on my Tribeca now and I still love the car.
#20 of 70
Re: Lost power [mikejl] by ateixeira
Sep 11, 2007 (12:57 pm)
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Replying to: mikejl (Sep 11, 2007 7:25 am)

That's a lot of miles!
 
Maybe there isn't much of a baffle in the fuel tank so the gas sloshes around, starving the fuel pump temporarily.
 
I'd fill up sooner, too, because you can overheat the fuel pump if it runs dry for too long.
#21 of 70
Re: Lost power [ateixeira] by mikejl
Sep 12, 2007 (4:42 am)
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Replying to: ateixeira (Sep 11, 2007 12:57 pm)

I don't think there is much chance of the fuel pump running dry with 2.5 gallons (or more) in the tank, although that is something to think about. I think the problem may be with the sending unit or some other sensor that 'reads' the fuel level. I believe it cuts off the fuel pump prematurely based on an incorrect reading.
 
If this is what is happening, then keeping more fuel in the tank should prevent any further occurrences. Time will tell.
#22 of 70
Re: Lost power [mikejl] by ateixeira
Sep 12, 2007 (7:10 am)
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Replying to: mikejl (Sep 12, 2007 4:42 am)

Maybe they turn off the fuel pump if they "sense" the tank is empty, and that sensor is failing?
 
Just speculating as to the cause.
#23 of 70
Re: Lost power [ateixeira] by mikejl
Sep 12, 2007 (10:08 am)
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Replying to: ateixeira (Sep 12, 2007 7:10 am)

This will probably be a tough problem to truly diagnose. All I have is speculation, too, and I could be totally off base.
 
I think I would have had this problem more often, or at least sooner after the first time, if it was a failing sensor. (I'm speculating again.) I'm thinking it is a sensor that is poorly positioned, due either to poor design or an assembly error on my particular vehicle. Probably the latter.
 
There is no way to verify that, short of a more drastic repair action than I want have done at this point. If it happens again, and I have been successful in keeping more gas in the tank, I might have to have it thoroughly checked out.
#25 of 70
Humming noise at 29mph by dbarlow
Nov 24, 2006 (4:45 pm)
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In mild or warm weather I get a loud hum from what sounds like the front left at exactly 29mph. Anybody else have the problem...and more importantly found a dealer that can find it and fix it?
#26 of 70
Re: Humming noise at 29mph [dbarlow] by ateixeira
Nov 25, 2006 (6:34 am)
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Replying to: dbarlow (Nov 24, 2006 4:45 pm)

Give us more details... this is a Tribeca, right? What year?
 
Does it happen while coasting, or only when you're on the gas?
 
I would lube the sway bars first, because that's so easy. My guess is it would be wheel bearings or something in the suspension that is just resonating at a frequency that causes that noise.
 
-juice
#27 of 70
Re: Humming noise at 29mph [ateixeira] by dbarlow
Nov 25, 2006 (7:13 am)
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Replying to: ateixeira (Nov 25, 2006 6:34 am)

I agree it sounds most likely like a bearing. Here are the particulars:
 
2006 B9 Tribeca 7 psgr. Outside temp needs to be between 45 and 75. If is colder or warmer it goes away or is very faint. Sometimes you can hear it at other speeds but it is at it's loudest at exactly 29mph. VERY loud sometimes. Sometimes it goes away when I drive it for a while and it warms up. But then it could come back at any time. Of course when I take it to the dealer they never hear anything...except one time when I insisted on taking one of them for a drive. They put it up on the rack and ran the wheels while listening with a scope...but heard nothing. Which tells me it needs a load on the tires. The noise happens both when coasting and when hitting the gas. Nothing to do with the brakes either as I have heard it when hitting the brakes and when not. Dry roads or wet so it isn't the tires.
#28 of 70
Re: Humming noise at 29mph [dbarlow] by ateixeira
Nov 25, 2006 (2:35 pm)
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Replying to: dbarlow (Nov 25, 2006 7:13 am)

It's gotta be the bearings, then. What else changes under load like that?
 
The noise should get progressively worse, but see if they'll replace them pre-emptively.
 
-juice

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