A problem that has been unsolvable!!
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This is a discussion on A problem that has been unsolvable!! within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hey guys, i purchased my first wrx 9 months ago. i got a 2001 bugeye sedan 5spd man. it is ...

  1. #1
    Registered User
    Join Date
    Sep 2015
    Gold Coast, Australia

    Angry A problem that has been unsolvable!!

    Hey guys,

    i purchased my first wrx 9 months ago.
    i got a 2001 bugeye sedan 5spd man. it is completely stock and has 125*** km on the clock. (122***) when i got it.
    the previous owner had the car in storage for 18months as he was overseas and his mate took it for him to sell.

    from the second week i have owned this car it has given me grief. when the car is just starting to warm up it runs perfect.
    the main problem i have had is the car jerks and pops when i accelerate into boost once that car has warmed up. if i slowly accelerate it feels like a
    rough (like a slightly bumpy road) and gradually gains speed until it jerks. it jerks and coughs in all gears and starts at 2800rpm and cant really get past

    the car has never had the CEL come on at all. this car has seen several mechanics including a subaru specialist and a subaru dealer.

    slowly, one by one, i started replacing parts. i started with a service, and part replacement

    *replaced and correctly gapped the plugs (nkg platinum)
    *replaced the air filter which was orange and filthy with a genuine wrx filter
    *cleaned the MAF sensor
    *replaced the fuel filter (this is where it got interesting) the fuel that came out of the 'out' side was brown ish.
    the 'in' side prior to the filter was dark brown when i tipped it out. so at this point i didnt put the new filter in just yet.
    *opened the fuel pump cover and removed the fuel pump. i was sure this was the issue. it was rusty inside and a thick sludge covered
    the fuel pump and the filter.
    *ihad the fuel tank emptied and scrubbed and flushed as much of it out as possible.
    *replaced with a bosch 265lph fuel pump put in some fuel and primed the lines without the filter and pushed any junk in the fuel lines
    out into a clear cup.
    *put the new filter on, reset the ecu and started the car.

    it seem to run perfect for about 5kms and was still doing it once it was really heated up.

    a mechanic and 90% of the issues i found on the next like this pointed to MAF, the coils or boost/vac leak.
    *replaced and fixed all.
    didnt fix it.

    subaru specialist said it could be a faulty front 02 sensor since he though it maybe fuel related
    *replaced that and it also didnt fix the problem.

    finally yesterday i took it to a subaru dealer service centre. the guy who worked on it even owned a wrx exactly the same and after 5 hours in the shop
    he couldnt find an issue with it.

    i have spent thousands on finding and resolving an issue and have had enough.
    i am hoping someone on here may have had a similar issue and might have solved it with something different.

    a few things i though it may be just have not had enough time to spare to check is;
    *fuel pressure regulator
    *boost solenoid (since the car is stock my obdii sensor is also telling me the car is hitting 16psi when it boosts well and engine is cooler)
    *tgv valve

    i also have had the brant alarm system in the car bypassed, could anyone tell me if they have had this done and the key on their dash continues to flash a minute after the car is started and if this is normal?

    any thoughts and/or ideas please feel free to pass them on.


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  3. #2
    ClubWRX.net Vendor rexxx0486's Avatar
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    Jan 2007
    North NJ
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    I'm not a technician, but I'd try swapping the maf for a known good one if possible.just because you cleaned it does not eliminate it as a potential problem.
    -Clayton, Your official CLUBWRX Subaru Dealer!
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  4. #3
    Registered User
    Join Date
    Sep 2015
    Gold Coast, Australia
    "a mechanic and 90% of the issues i found on the next like this pointed to MAF, the coils or boost/vac leak.
    *replaced and fixed all.
    didnt fix it."

    this part is where i replaced the MAF with a new genuine part

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  6. #4
    Water.....sometimes waves rqjoe's Avatar
    Join Date
    Feb 2015
    I Support ClubWRX
    I am not familiar with older Subarus. However, I do know that many cars run in an "open loop" mode until warmed up and then switch to a "closed loop" mode. Open loop means that the engine management system just runs on a pre-programmed set of parameters, and that usually includes rich fuel settings. Once in closed loop mode the engine controller takes over and makes adjustments to parameters based on input from various sensors. So it sounds like you either have a bad sensor somewhere or a bad ECU. Sorry, can't help on which ones to look at though. I would have someone with a OBDII scantool look for stored codes even though you see no CEL. Sometimes things like cylinder misfires will store, and not cause the light to come on. This might at least give you a hint at where to start looking. And I mean a REAL scantool, not the ones the auto parts stores have and use to do free checks for you.

  7. #5
    Registered User 15WRBlue's Avatar
    Join Date
    Dec 2014
    Near Lansing MI
    Sounds a lot like problems I was having on my '92 Stealth RT/TT. They were/are notorious for having issues with leaking capacitors in the ECU. So common that there are quite a few companies that repair them. Sent mine in for repair and it fixed the issue.

    Had a secondary issue with similar symptoms as well with the Stealth when I took off the stock tour/sport electronic adjustable struts and put in standard ones. The stock struts had electrical connections back to a suspension computer which for some reason was also connected to the ECU. Not having valid signals from the struts apparently caused the car to run terrible. I didn't understand it but all fixed after I unplugged the suspension computer.

    Point is that problems with systems that wouldn't seem to have any relationship to each other can cause obscure issues you would never think of. If you have systems that are no longer "stock" on the car, it could be that causing other issues.
    '15 WRX Premium -- Sunroof, short throw, upgraded lights (SubiSpeed LED DRL boomerang, OLM HID 5000K low-beams, OSRAM 5000K high-beams), TapTurn, STi Wing, 20% Tint
    Other current: '92 Stealth RT/TT, '07 Avalanche LTZ
    Previous: '04 Saab 9-3, '02 WRX, '94 3000GT SL, '91 Eclipse GSX, '82 Porsche 931 (924 turbo), '79 Saab 900T, '81 Mitsubishi Starion, '80 Triumph Spitfire, '74 Saab Sonett III, '72 Opel GT

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