Car is running wierd all of a sudden
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This is a discussion on Car is running wierd all of a sudden within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; 2002 WRX 70,000 miles Had most of 60k service done at 60k Start car idles higher than normal say about ...

  1. #1
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    Car is running wierd all of a sudden

    2002 WRX
    70,000 miles
    Had most of 60k service done at 60k

    Start car idles higher than normal say about 2000 rpm for a while
    When I accelerate the motor revs higher when I depress the clutch.
    This happens when I accelerate and shift fairly normal to aggressive.
    If I accelerate real slowly it does not happen.
    When I would stop for a light fairly quickly, and then come to a stop with clutch in, the car stalls... not keeping idle.
    Then going home and shifting 3 to 4 and in 4 at about 4500 rpm the motor starts to hesistate and check engine light comes on.
    So I parked it.
    Don't know what code it threw as I do not have the scanner.
    I cleaned the MAF a few weeks ago and use only top brand gas.

    Is this the 02 sensor going bad??
    Doen't act like a vac leak to me, but I've never had a turbo car before.

    Thoughts?

    WR
    2002 Black WRX
    1998 GMC 1500 Pick up
    *1988 corvette street legal pro-street car
    best time 1/4: 10.5 sec at 129 mph
    *2003 Great Lakes Region Corvette Challenge Drag Racing series Points Champion.
    *2006, 2007, & 2008 NMCA True Street Class winner

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  3. #2
    Geriatric Ginger Mod Rogan's Avatar
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    Hmm.. It's really hard to tell..
    The high idling does sound like a vac. leak.

    Really need to get the code checked. AutoZone should be able to scan it for you, for free. I'd start by determining the code.

    You can also reset the ECU and see wtf happens..
    Rogan o_0
    '96 Dodge 2500 CTD @ 40psi - over 700 lb/ft TQ, 7" stack, and 5speed! - SOLD
    '01 Dodge 2500 CTD 6-holed hand-shaker - 3850# dual disk - 900 lb/ft - SOLD
    '97 Dodge 3500 CTD DUALLY built Auto - 40psi boosties - 750 lb/ft

  4. #3
    Registered User justin.jordan2's Avatar
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    Could Be A Number Of Things Sounds To Me Like You Have A Cloged Injector, Or Yes The O2 Sensor Is Going Bad, When Was The Last Time You Changed Ur Plugs.
    COBB FLASHED STAGE 2, UPPIPE, DOWNPIPE WITH HIGH FLOW CAT, AND FULL 3 INCH CAT BACK, 160 CRUCIAL RACING THERMOSTAT, K&N FILTER. TRACK: 1/4 MILE 13.66 102.7 MPH ON THE COBB OTS MAP

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    Quote Originally Posted by justin.jordan2 View Post
    Could Be A Number Of Things Sounds To Me Like You Have A Cloged Injector, Or Yes The O2 Sensor Is Going Bad, When Was The Last Time You Changed Ur Plugs.
    Injector..hmmm.
    Dealer suggested an injector service when I had the car in for the 60k..I passed because I always use good gas and Techron every 3000 miles.
    I asked about this service in another thread with no replies.
    Plugs were changed 10k miles ago at the 60k service.

    I thought vac leak too.
    reset ecu...Just unplug the battery and reconnect?

    WR
    2002 Black WRX
    1998 GMC 1500 Pick up
    *1988 corvette street legal pro-street car
    best time 1/4: 10.5 sec at 129 mph
    *2003 Great Lakes Region Corvette Challenge Drag Racing series Points Champion.
    *2006, 2007, & 2008 NMCA True Street Class winner

  6. #5
    Registered User ajd111's Avatar
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    Quote Originally Posted by justin.jordan2 View Post
    Could Be A Number Of Things Sounds To Me Like You Have A Cloged Injector, Or Yes The O2 Sensor Is Going Bad, When Was The Last Time You Changed Ur Plugs.
    Holy caps batman!
    Quote Originally Posted by BrianH View Post
    Careful, I still think she's packin wang.

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    Same thing

    I have an 03 WRX and i got on the internet looking for a solution to my problem it sounds like your having the same thing. My car idles ruff and when i mash the gas it hesitates or bucks and back fires i had it at the dealership and they said they replaced plugs fuel pump and sensors even fixed blow off valve and they couldn't fix it im a grand in the hole and lookin at lots more what is this mysterious problem?

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    Quote Originally Posted by VashWRX View Post
    I have an 03 WRX and i got on the internet looking for a solution to my problem it sounds like your having the same thing. My car idles ruff and when i mash the gas it hesitates or bucks and back fires i had it at the dealership and they said they replaced plugs fuel pump and sensors even fixed blow off valve and they couldn't fix it im a grand in the hole and lookin at lots more what is this mysterious problem?

    One large later and you still have an issue??

    THAT's what I am trying to avoid.

    I can't stand a dealer that just throws parts at a problem hoping to fix what they really don't know.

    WR
    2002 Black WRX
    1998 GMC 1500 Pick up
    *1988 corvette street legal pro-street car
    best time 1/4: 10.5 sec at 129 mph
    *2003 Great Lakes Region Corvette Challenge Drag Racing series Points Champion.
    *2006, 2007, & 2008 NMCA True Street Class winner

  9. #8
    Moderator Donkey's Avatar
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    Quote Originally Posted by WR Wreck's View Post
    2002 WRX
    70,000 miles
    Had most of 60k service done at 60k

    Start car idles higher than normal say about 2000 rpm for a while
    When I accelerate the motor revs higher when I depress the clutch.
    This happens when I accelerate and shift fairly normal to aggressive.
    If I accelerate real slowly it does not happen.
    When I would stop for a light fairly quickly, and then come to a stop with clutch in, the car stalls... not keeping idle.
    Then going home and shifting 3 to 4 and in 4 at about 4500 rpm the motor starts to hesistate and check engine light comes on.
    So I parked it.
    Don't know what code it threw as I do not have the scanner.
    I cleaned the MAF a few weeks ago and use only top brand gas.

    Is this the 02 sensor going bad??
    Doen't act like a vac leak to me, but I've never had a turbo car before.

    Thoughts?

    WR
    List all your mods.You might want to invest in a OBD II code reader.They are very cheap now a days.First step is to get the DTC read.That will help the diagnosis go much quicker.
    Resident Adviser @ WTF Tuning, LLC
    2002 FORESTER S
    1998 FORESTER S




  10. #9
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    Quote Originally Posted by Donkey View Post
    List all your mods.You might want to invest in a OBD II code reader.They are very cheap now a days.First step is to get the DTC read.That will help the diagnosis go much quicker.

    No engine mods. 100% stock.
    I had a BOV a while ago but took THAT off once I knew better.

    I will stop by a friends shop and get a read on Monday if I can.

    WR
    2002 Black WRX
    1998 GMC 1500 Pick up
    *1988 corvette street legal pro-street car
    best time 1/4: 10.5 sec at 129 mph
    *2003 Great Lakes Region Corvette Challenge Drag Racing series Points Champion.
    *2006, 2007, & 2008 NMCA True Street Class winner

  11. #10
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    Update and closure:

    It was a vac leak.

    Hose clamp connecting to (stock) BOV came loose allowing outside air flow.

    Simple fix. Car runs good now.

    WR
    2002 Black WRX
    1998 GMC 1500 Pick up
    *1988 corvette street legal pro-street car
    best time 1/4: 10.5 sec at 129 mph
    *2003 Great Lakes Region Corvette Challenge Drag Racing series Points Champion.
    *2006, 2007, & 2008 NMCA True Street Class winner

  12. #11
    Geriatric Ginger Mod Rogan's Avatar
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    Quote Originally Posted by Rogan View Post
    Hmm.. It's really hard to tell..
    The high idling does sound like a vac. leak.
    Quote Originally Posted by WR Wreck's View Post
    Update and closure:

    It was a vac leak.

    Simple fix. Car runs good now.

    WR
    w00t w00t! I finally guessed correctly!
    Rogan o_0
    '96 Dodge 2500 CTD @ 40psi - over 700 lb/ft TQ, 7" stack, and 5speed! - SOLD
    '01 Dodge 2500 CTD 6-holed hand-shaker - 3850# dual disk - 900 lb/ft - SOLD
    '97 Dodge 3500 CTD DUALLY built Auto - 40psi boosties - 750 lb/ft

  13. #12
    Registered User Timdog1650's Avatar
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    For the record, before you start suspecting bad sensors, injectors, busted motors, etc, etc, it's always a good idea to do a full pressure test of your induction system to make sure there's no "simple" fix. From your description of the problem, I was going to say either vacuum leak OR Idle Air Control valve malfunctioning. It is an easy fix, can be found on this forum or nasioc, but the Idle Air Control valve, when dirty, can cause erratic RPM at idle and decel.

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