The AUSubaru.com.au Forums

Posted: **Sun Oct 16, 2005 6:59 pm**

My wife's car 95 liberty ej22 complaning about the car having no power, shuttering and stalling at lights i have checked the air filter and plugs can't see anything else can anybody help

Posted: **Sun Oct 16, 2005 8:28 pm**

could it be having trouble with fuel delivery, how old is the fuel filter etc, also is your timing out maybe??? just throwing around suggestions

Posted: **Sun Oct 16, 2005 8:39 pm**

Dirty MAF? O2 sensor?

Posted: **Sun Oct 16, 2005 9:04 pm**

Have u checked for engine codes??

Dave

Posted: **Mon Oct 17, 2005 3:51 pm**

Filter isn't that old she is going to a dealer tuesday they will put it on the computer to see thanks.

Posted: **Mon Oct 17, 2005 5:21 pm**

Sounds MAF related to me...

Posted: **Mon Oct 17, 2005 7:15 pm**

u don't need a computer to check for engine codes. Does the engine light come on while your driiving at all??

Dave

Posted: **Tue Oct 18, 2005 9:48 pm**

My wife took it to highway subaru they gave it a (complete upper cylinder clean out ???? found 2 codes cleared then took it for a road test rechecked codes and all appear ok) that is what they said on the report when i got home i took it for a drive thay have put the idle up to about 1250 rpm too fast and for the first time i felt the shudder it didn't feel like the engine it felt like the auto was not disengaging when slowing down i popped it into neutral and gave it a rev it seemed ok it didn't shudder or misfire i will get her to take it back to slow the idle down. Dave do you own the buggy from byb bbq if so i'm jan hi

Posted: **Wed Oct 19, 2005 12:49 pm**

Hmmm, sounds like they had no idea what they were doing. Looks like:
1. They did something that probably didn't really need doing (upper cylinder clean - although probably nice to give the car a bit of a treat).
2. Introduced another problem (fast idle).
3. Didn't fix what you took the car in for.
If I were you I'd be taking it back to get them to fix the idle issue, then looking for a new mechanic.

Posted: **Wed Oct 19, 2005 8:57 pm**

idle is meant to be controlled by the ECU... so it being higher now is a little odd.

Dave

Posted: **Wed Oct 19, 2005 9:20 pm**

Took the car back he had a look and cleaned out the maf said after the complete upper cylinder clean out a bit of crap got in there he said give it time it will free up hope so thanks every body.

Posted: **Wed Oct 19, 2005 9:53 pm**

SuBaRiNo wrote:idle is meant to be controlled by the ECU... so it being higher now is a little odd.

Dave

You can adjust the idle via the idle screw on the side of the throttle body (touches the throttle linkage). Subaru did this when my mum asked for the idle to be turned up slightly on the Forester. The screw allows manual adjustment of base idle, and doesn't interfere with the ECU's idle up/down functions (as this is carried out by the BAC).

Posted: **Thu Oct 20, 2005 8:03 am**

Save me some time and frustration please, by explaining meanings of MAF and BAC.
Thanks, Steve

Posted: **Thu Oct 20, 2005 9:25 am**

MAF - Mass Air Flow. Basically this sensor counts the volume of air entering the engine, and from this the ECU calculates engine load and thus adjusts the amount of fuel accordingly. The 02 sensor is the telltale on this, basically lets the ECU know how much fuel was actually burnt.

BAC - Bypass air controller. Allows the ECU to move the idle from its base, ie raise it when the A/C is switched on, when the power steering is getting a workout on the spot (carpark), even when the car is put into gear on some models. Oh, and allows a high idle on cold start. In simple terms it consists of a pipe that bypasses the throttle body that has a computer controlled valve in it, meaning that the engine idle is not set by the position of the plate alone. It does NOT set base idle.

Posted: **Thu Oct 20, 2005 1:03 pm**

Thanks for that Tim. Very well explained and much easier than hunting around for an answer.

Posted: **Thu Oct 20, 2005 2:28 pm**

LOL. Cheers, glad it made sense.