2000 Subaru Outback Sedan LTD Possible Vacuum Issues


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2000 Subaru Outback Sedan LTD Possible Vacuum Issues

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Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

Aonghus
New User

Jun 9, 2010, 10:07 PM

Post #1 of 3 (2307 views)

2000 Subaru Outback Sedan LTD Possible Vacuum Issues	Sign In

I have a 2000 Subaru Outback Sedan LTD with the 2.5L 4 Cyl, about 158k Miles.

About a week ago I noticed the heat/air conditioning was stuck on the passenger vents only. This was coupled with a issue at idle. It was either all over the place in rpm, ranging from 400 to 1800 rpm's at idle. When it does finally settle it sits around 600rpm. I hadn't noticed any power loss once i got on the throttle.

Now (only today) I have notice that when maintaining speed(such as using cruise control) there is a miss now and again where the car seems to jolt(I believe a crack motor mount may be exacerbating this). Also when I brake for a long period of time I get the same fluctuation in rpm as they decrease.

I am not sure what this could be but my initial research seems to say that the vents and brake systems all tie into the vacuum system of the car, hence the suspicion.

I haven't worked much on cars before, but being a poor college student i hope to be able to fix this myself, any information on how I could go about diagnosing the location of the leak or fixing it would be a great help.

When the problem first started there was also there was a few times where the rpm issue seemed to go away, which fixed the vent issue. Unfortunately it came back very shortly afterwards.

It went away both when the engine was cold and hot however so i am not sure that that makes a big difference.

Thanks again for your time.

Aonghus

nickwarner
Veteran / Moderator
nickwarner profile image

Jun 10, 2010, 7:59 PM

Post #2 of 3 (2301 views)

Re: 2000 Subaru Outback Sedan LTD Possible Vacuum Issues	Sign In

It does sound like a vacuum leak somewhere. First, look over all the vacuum hoses and check for cracking or damage. If none found, take a can of carb cleaner and spray around the brake booster and intake while running. Be gentle with this stuff and careful where you spray it, as it is flammable and you don't want a fire. If the RPM's go up when you spray a certain spot you have found the leak.

Aonghus
New User

Jun 11, 2010, 1:14 AM

Post #3 of 3 (2299 views)

Re: 2000 Subaru Outback Sedan LTD Possible Vacuum Issues	Sign In

I did try that today, and no such luck. I am going to be taking the vacuum hoses off and inspecting them individually. Is there anything else this could be that also wouldn't set off a code?

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