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Old 10-08-2012, 10:21 AM   #1
LuciaPwNs
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Default 00' Forester brake vibration when stopped.

Howdy, my beloved Forester (00' AT 127k) is having some problems that I want to resolve. I love driving her but these problems take the all of the joy away....Basically, my problem is that when I'm completely stopped, the brake and gas pedal vibrate slightly. I've noticed it only happens when the engine rpms drop below a certain point (<1k) and a little bit when I start to accelerate. Other than that it seems to work fine. I tried to adjust the TB to try to keep the rpms up but its DBW =(; I also put some injector cleaner through the system. The last thing I can think of is that this problem started slowly, meaning it was real intermittent, now it happens every time I drive.


PS
I've also started getting a CEL (P0440) "Evap Emissions System".
I don't know if this has anything to do with it but I've changed the gas cap already. I have a little rust around the cap which I'll check soon. My girlfriend is going to do some kinda test for leaks next time she is at school.
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Last edited by LuciaPwNs; 10-08-2012 at 11:33 AM.
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Old 10-08-2012, 11:32 AM   #2
bugeyetex
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I hope she doesn't have any leaks

Now on to the car. What is your maintenance history on it? When was the last time you did a tune up? Have you checked your motor motor mounts?
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Old 10-08-2012, 11:47 AM   #3
LuciaPwNs
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Quote:
Originally Posted by bugeyetex View Post
I hope she doesn't have any leaks

Now on to the car. What is your maintenance history on it? When was the last time you did a tune up? Have you checked your motor motor mounts?
Maintenance? I bought it at 123k I think, so I don't know to much about it. There is a sticker in the engine bay I'll see what has been performed and post it later (I'm working). As for the tune up, never. at least since I've owned it. I have not checked the mounts yet on either the transmission or engine, that will be something my gf does, as she has access to a lift. That is also the conclusion I came to but I wanted to compile of list of things to check out. The car sounds like its supposed to so I didn't think it was a tune up problem.
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Old 10-08-2012, 11:56 AM   #4
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Does the vibration go away when you put it in neutral?
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Old 10-08-2012, 12:14 PM   #5
LuciaPwNs
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Quote:
Originally Posted by bugeyetex View Post
Does the vibration go away when you put it in neutral?
yes, but only because it no longer has a load and the rpms return to > 1k.



edit: its usually around 750 rpms when it starts acting up.

Last edited by LuciaPwNs; 10-12-2012 at 11:50 AM. Reason: 750 rpms not 500
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Old 10-08-2012, 01:44 PM   #6
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I would definitely check the mounts then. Eng and trans.
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Old 10-09-2012, 10:38 AM   #7
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Should have your girlfriend teach you some things from the sounds of it
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Old 10-09-2012, 11:03 PM   #8
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^ haha

Any updates?
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Old 10-10-2012, 10:56 AM   #9
LuciaPwNs
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Updates:

i looked on the sticker and it said the fuel system and transmission were serviced at 91k.

bitch was raging this morning and forgot to take her.

Last edited by LuciaPwNs; 10-10-2012 at 11:05 AM.
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Old 10-10-2012, 11:03 AM   #10
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Should have your girlfriend teach you some things from the sounds of it
FFFUUUU!
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Old 10-10-2012, 11:53 AM   #11
Eyedoc Orlando
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Sounds like a possible vacuum leak to the brake booster. The brake booster is controlled off engine vacuum and could pulse or act weird if there is a leak in the system. It may also cause a funny or pulsed idle. At that many miles I would replace all the vacuum lines and see if the problem disappears, it's a cheap fix too. While you're at it make sure to change the PCV valve
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Old 10-10-2012, 11:25 PM   #12
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^ this- no.

It would idle like SHRt at all times if this were the case, not just when it is in gear. Always a good idea to keep an eye on your old brittle vaccum lines though. I know I could use a few. This Texas heat turns rubber into plastic in about 5-6 years without direct sunlight...
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Old 10-11-2012, 12:16 AM   #13
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I had a very similar problem, it turned out to be aftermarket CV axles which our subarus dont like. Subaru OEM axles fixed my issue
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Old 10-12-2012, 09:31 AM   #14
LuciaPwNs
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Quote:
Originally Posted by bangedlegacywagon97 View Post
I had a very similar problem, it turned out to be aftermarket CV axles which our subarus dont like. Subaru OEM axles fixed my issue
Thats very odd. I cant really fathom how that caused the problem.

Ill have to take a look at my vaccum lines as I plan on running this car into the ground.
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Old 10-12-2012, 11:37 AM   #15
Patrick Olsen
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Quote:
Originally Posted by bugeyetex View Post
When was the last time you did a tune up?
What do you mean by "tune up"?

Quote:
Originally Posted by LuciaPwNs View Post
yes, but only because it no longer has a load and the rpms return to > 1k.

edit: its usually around 500 rpms when it starts acting up.
The idle in N shouldn't be appreciably different than the idle in gear, so I'm not sure why it would jump > 1krpm when you shift to N. That doesn't sound right. And the idle also shouldn't be down around 500rpm - if it's getting down that low, then something is wrong.

(Note that on most Subaru tachometers, the tick mark for 500rpm is right next to 0. I'm guessing that when you say "around 500", it's really around 750rpm.)

Quote:
Originally Posted by bangedlegacywagon97 View Post
I had a very similar problem, it turned out to be aftermarket CV axles which our subarus dont like. Subaru OEM axles fixed my issue
Sooooo... your CV axles were causing the brake pedal and gas pedal to vibrate while stationary, as the OP's car is doing? Either you had some really strange CV axles, or your problem was not "very similar" to the OP's.

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Old 10-12-2012, 11:40 AM   #16
LuciaPwNs
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Quote:
Originally Posted by Eyedoc Orlando View Post
Sounds like a possible vacuum leak to the brake booster. The brake booster is controlled off engine vacuum and could pulse or act weird if there is a leak in the system. It may also cause a funny or pulsed idle. At that many miles I would replace all the vacuum lines and see if the problem disappears, it's a cheap fix too. While you're at it make sure to change the PCV valve
Quote:
Originally Posted by bugeyetex View Post
^ this- no.

It would idle like SHRt at all times if this were the case, not just when it is in gear. Always a good idea to keep an eye on your old brittle vaccum lines though. I know I could use a few. This Texas heat turns rubber into plastic in about 5-6 years without direct sunlight...
I just thought of something....My cruise control doesn't work either. Its not a big deal to me but it might have something to do with my real problem. The light turns on but I cant set or change my speed. My dad mentioned that cruise control used to be driven off of vacuum, is this still the case? If so, I think we found the problem
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Old 10-12-2012, 11:46 AM   #17
LuciaPwNs
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Quote:
Originally Posted by Patrick Olsen View Post
What do you mean by "tune up"?


The idle in N shouldn't be appreciably different than the idle in gear, so I'm not sure why it would jump > 1krpm when you shift to N. That doesn't sound right. And the idle also shouldn't be down around 500rpm - if it's getting down that low, then something is wrong.

(Note that on most Subaru tachometers, the tick mark for 500rpm is right next to 0. I'm guessing that when you say "around 500", it's really around 750rpm.)


Pat Olsen
Yes after writing this I did notice it was actually 750, not 500 like I had originally posted.
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Old 10-13-2012, 12:15 PM   #18
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Quote:
Originally Posted by Patrick Olsen View Post
What do you mean by "tune up"?
Plugs, fuel filter, etc. Normal preventative maintenance.
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Old 10-14-2012, 05:03 PM   #19
LuciaPwNs
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Problem fixed:so my girlfriends grandpa looked at the car and noticed a vacuum line that wasn't attached to the intake manifold, it was running from the cruise control canister. my cruise control now works and the vibration went away. when i leave I'll detach it and see if the brake problem returns. just to make sure.

edit: CEL is still on, and waiting to be looked at......

Last edited by LuciaPwNs; 10-16-2012 at 09:54 AM.
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