Mystery Misfire problems.. 2002 Legacy Wagon 5sp MT

Discussion in 'Subaru Legacy' started by Bryan H, Jul 23, 2018.

  1. Bryan H

    Bryan H

    Jul 23, 2018
    Likes Received:
    Portland, Oregon

    I am new to this Subaru forum and I am hoping to get some help or advice from experts with Subaru’s. I am not a mechanic. I work with wood for a living, but have a good mechanic I trust.

    This is my first Subaru. It is a 2002 Legacy Wagon AWD 5 speed MT. NOT AN OUTBACK.

    My car is experiencing misfire issues. Below 2500 rpms. My mechanic and I have exhausted everything we can imagine it may be.

    Here is what it’s doing. When the car gets heated up, it’s misfiring when it’s below about 2500RPMs.

    When I try to take off in first gear it bogs and sputters and misfires, until I get up to about 3500 RPMS, then it takes off like I am trying to drag race. Same happens when I get into 2nd gear and so forth. While driving the misfire would make a passenger think I don’t know how to drive a shift. A lot of shaking back and forth, so I have to keep revved up around 3000 RPMS.

    I think its heat related for some reason? My mechanic thinks I am crazy. When it’s cold in the mornings it doesn’t do this very often. When the engine gets hot, or the day gets warmer, the issues start. At a stop light, the engine will slow down around 500 rpms, then begin to sputter and stammer… but the engine fan will turn on, then it will rev back up to 750 rpms, and idle well. This makes me think heat has something to do with this.

    This really has my mechanic scratching his head too. We don’t know what to look at next.

    I get a check engine light and it’s a code OBD2 – FUEL SYSTEM TOO RICH

    This is what we have fixed/replaced so far.

    • Valves have been adjusted

    • New ignition coils and cables. New Spark plugs

    • New MAP Sensor

    • Ran fuel injector cleaner thru a full take of gas a couple times in the past month.

    • Changed to a better quality gas

    • Timing belt appears to be fine.

    • New air flow housing and air filter.
    Other repairs that I have done that I don’t think are related:

    • Replaced the transmission

    • New clutch

    • New rear driveshaft when replaced transmission.

    • Replaced front axels

    I am hoping for suggestions on what to look at next. I love this car. I want it to run for quite a while. I’m a single dad with two kids that gets out in the PNW a lot.

    Any suggestions to look at next or shops you can recommend???



    Bryan H, Jul 23, 2018
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