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Old 07-08-2010, 01:28 AM   #1
AnointedDrummer
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Location: WRXcellence:)LaGrande, Oregon
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2007 4sale!STAGE2WRX
Blur of UrbanGreyMetallic

Default Yes, another weird issue. (2 actually :0)

Helped my wife's cousin buy an auto '99 Impreza (na). The carfax came back great. Looked all over it and it's in great condition. Only two or three previous owers. I test drove it; good. Now, two weeks later, the check engine light is on (intermittantly at first, now more constant) and its doing this: while ideling, if its in park or neutral it purrs perfectly; put it in drive or reverse and it idles realy rough for a few seconds then smooth..rough again then smooth. What's up??

PS: not only that, but the brakes (from day1) were sub-par. If you put it in drive and press the brake pedal to the floor (and it does go all the way to the floor), the little, old, non-turbo engine can almost move the car and actually did one time when it was warmed up and i was testing it. Is this common?? Fluid is up. Will check pads tomorrow. Anything else??

Thanks guys.
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Old 07-08-2010, 01:31 AM   #2
Jaren1
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save yourself the headache in the future and remember carfax is virtually worthless.

Get the car checked by a shop
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Old 07-08-2010, 01:37 AM   #3
AnointedDrummer
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Blur of UrbanGreyMetallic

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Well, its a start; if there were issues listed I woulda just scraped it from the beginning. So you really have no idea then? Thanks for the suggestion anyway semi-neighbor (Have a couple friends in Bend, Im in LG)
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Old 07-08-2010, 02:03 AM   #4
PhilSine
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98 OBS-T, 91 Legacy SS

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Bleed the brakes and find the huge vacuum leak.

Also get the code read and post it and go from there.

There should be a sticky saying "If you have a CEL on get it read and post the results prior to asking for further advice."

I know that sounds like me being a jerk but in reality its more an effort to allow us to better help you. Knowing the error code greatly helps narrow down issues.
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Old 07-08-2010, 03:04 AM   #5
AnointedDrummer
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No offence taken at all. I have a Cobb AP for my 07 wrx, wish it could work for her impreza. I'll try to get that done and post it here befor allowing a mechnic to dive in. Thanks PhilSine.
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Old 07-08-2010, 05:53 PM   #6
kewlboxer2
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Maybe spark plugs/wire/coil for the rough running.
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Old 07-08-2010, 08:10 PM   #7
NaturallyAspirated
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The brakes aren't really the greatest, I'll agree with you there.

The front brakes are tiny little rotors matched up to single piston calipers. The rears are drums. Most people who own older generation Imprezas use stock WRX rotors, brackets, and 2 piston calipers for the front, and do a rear disc brake swap in the back.
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Old 07-09-2010, 12:36 AM   #8
AnointedDrummer
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THANKS GUYS.
Owner of the used car shop where we bought it (old friend of mine) red the code and has agreed to give it a tune up, buy a knock sensor and install(?) it for $150 (woulda posted code here but I wasnt present during reading, sorry!) Have a clue if that will work? Knock sensor. Sounds like a tool, a problem detector not a problem fixer. Any info bout that?

As far as the brakes go, he decided to dismiss the last $250 of the downpayment she owed him so she could take it to a mech to inspect the brakes. He suggested bleeding the system and adjusting it up...something like that.

So...

U guys rock.
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Old 07-09-2010, 12:54 AM   #9
Jaren1
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well sounds like he is a cool guy and that you worked it all out.

Knock sensor is just what the car uses to determine if it is fully burning all the fuel. If its not then that sensor will tell the ecu to pull timing
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Old 07-09-2010, 01:06 AM   #10
AnointedDrummer
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Blur of UrbanGreyMetallic

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So its actually something that is installed on the vehicle and not a tool?
I know I sound ignorant. I am about some things. Sometimes it's better that way.
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Old 07-10-2010, 02:54 AM   #11
PhilSine
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98 OBS-T, 91 Legacy SS

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Knock sensor is located on the top rear of the engine on the driver's side slightly under the intake manifold. Its a little donut looking thing with a bolt through it and a wire with a two pin connector. Easy to change on NA cars and could be the culprit. They are prone to failures on Subarus.
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Old 07-10-2010, 02:58 AM   #12
AnointedDrummer
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Blur of UrbanGreyMetallic

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Hmmm. Ok then. I'll report back later how its doin when I find out. Been at work 4 hours, 14 hrs to go..... :-(
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Old 07-15-2010, 03:52 AM   #13
AnointedDrummer
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UPDATE: Havnt taken it to mechanic yet about brakes. But I guess the "tune up" was done. It fixed the intermittant harsh ideling...for about a day or 2. Now its right back to the same thing. If the code was saying 'knock' and the knock sensor didnt fix it...now what?
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