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Subaru engine repair questions and answers

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  • AutoMD Member
    AutoMD Member - 1997 Subaru Legacy - Engine - 12/14/2013
    Why does car start intermittently (sometimes it starts and sometimes it does not start)?
    Sometimes the car starts and sometimes it doesn't. Sometimes turning key repeatedly works and sometimes tapping on the starter works. When the car doesn't start, we may (sometimes) hear a clicking under the hood and around the fuse box under the glove box (at the ...
     
    • HouseCallAuto
      12/14/2013 HouseCallAuto
      1. Bypass the starter interrupt relay by jumping the Blue/White wire to the Blue/Red wire. If the problem no longer occurs the relay may be faulty or it may have an alarm system issue.

      2. Check for a loose ground cable near the starter.

      Here is a picture of starter interrupt relay location and by the way, these two relays are the same so you can swap them as a test. One is for the headlight alarm. http://imageshack.us/photo/my-images/824/captureqfp.jpg/
  • AutoMD Member
    AutoMD Member - 1997 Subaru Legacy - Engine - 12/14/2013
    Why does car start intermittently?
    Sometimes the car starts and sometimes it doesn't. Sometimes turning key repeatedly works and sometimes tapping on the starter works. When the car doesn't start, we may (sometimes) hear a clicking under the hood and around the fuse box under the glove box (at the ...
     
    0 answer
  • Diane
    Diane - 2004 Subaru Legacy - Engine - 12/12/2013
    After 15 mins driving, engine revs up and down 1000-2000 rpms at idle, won't settle down. Worse in cold weather
    Engine revs up and down like it is breathing, won't settle even if I step on gas and let up. Worse in stop and go traffic, and especially in cold (25F or colder) weather. May also be doing this while driving as occasionally feels like it wants to bog down or speed ...
     
    • HouseCallAuto
      12/12/2013 HouseCallAuto
      Try removing both battery cables from the battery (I SAID BOTH) and touch them together for a minute and then reconnect them, positive first and then negative and see if it solves it. If not replace the Idle Air Control (IAC) Valve.
  • Diane
    Diane - 2004 Subaru Legacy - Engine - 12/12/2013
    After driving 15 mins, pull to stop, engine revs up and down 1000-2000 rpms, won't settle down. Only in cold weather.
    Revs up and down like it is breathing. Tried stepping on gas to get it to settle down, made it worse. Especially bad in stop and go traffic. May be doing this while driving too - occasionally feels like it either wants to bog down or speed up when I have not applied ...
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1987 Subaru GL - Engine - 12/9/2013
    My check engine light has been on for two weeks but has ran fine till recently it has been over heating
    the vehicle has 2,43000 miles. it runs well although it could use a tune up.it has been over heating and loosing water about a quart at a time I find coolant on the pasanger side of car on the ground below the head there is no water in the oil the car runs cool ...
     
    • HouseCallAuto
      12/9/2013 HouseCallAuto
      You have a coolant leak and you have to identify where the origin of the leak is and then fix it. Don't worry about the CEL, just solve the leak. Use a cooling system pressure tester and do it when the engine is overnight cold which is the best condition for finding a leak - cold engine.
  • AutoMD Member
    AutoMD Member - 1990 Subaru Legacy - Engine - 12/4/2013
    No start issue. It acts like it wants to start and has spark.
    I've determined it to be a fuel issue, probably the pump. But first i want to check the relay, but not sure the location.
     
    • HouseCallAuto
      12/4/2013 HouseCallAuto
      Unless you already did, replace the coolant temperature sensor. This sensor on the old Subaru failed often and gave hard start issues. Do not replace the fuel pump unless you have a clear diagnosis of the pump either not turning on or it is producing low fuel pressure. Fuel pressure should be 26 to 30 psi at idle and higher during cranking before it starts. Maximum 37 psi
  • RoseofSharon
    RoseofSharon - 1995 Subaru Legacy - Engine - 11/30/2013
    Why does my car idle fast when I come to a stop, but goes back to normal when I hit the gas pedal?
    When I start the car the idle is fine, but after I've been driving, the engine races at about 1000 to 1500 rpms at a stop. To make the engine stop racing, I press the gas pedal to the floor and back real fast. Then it idles fine until the next time I stop. I don't ...
     
    • HouseCallAuto
      11/30/2013 HouseCallAuto
      The throttle body has to be cleaned and examined for any reason for binding, like an out of adjustment throttle cable.
  • AutoMD Member
    AutoMD Member - 2010 Subaru Forester - Engine - 11/6/2013
    My oil was low and my check engine light came on along with my cruise control light and traction control light.
    I added oil. When the car cools off the lights go off. When it heats up, the lights come back on.
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1988 Subaru GL - Engine - 10/29/2013
    Engine stops while driving
    car has new fuel pump,fuel filter, coil , after stopped for a few min. starts & goes sometimes just a few feet or a few miles!
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2009 Subaru Impreza - Engine - 10/27/2013
    Using engine oil, 1 litre per 2000 miles.
    hi, my car has done 30000 miles and has recently stated using engine oil, about 1 litre in 2000 miles, can any one help please.
     
    • CVO
      10/27/2013 CVO
      Worn valve stem seals will allow the engine oil to penetrate into the combustion chamber. Normally the oil consumption occurs in the engine with a higher mileage ( 70,000 miles ).See this site for valve stem seals.
      https://www.google.com/search

      Note: use the engine restore oil, it does help to reduce the oil consumption but not a 100% seal it.
  • 1wayralph86
    1wayralph86 - 1999 Subaru Legacy - Engine - 10/14/2013
    My car is over heating after i replaced radiator, water pump, an thermostat. I was told that its air locked.
    219876, running hot, it runs hot while driving, it just started two days ago,inside the car, yes check engine light is on,no other lights are on.
     
    0 answer
  • HDAVILA5
    HDAVILA5 - 2007 Subaru Outback - Engine - 10/7/2013
    Where do I find the O2 sensor relay?
    I need to find the O2 sensor relay to test it and see if it is the culprit for the steady Check Engine light and blinking cruise control light that comes on and disables the cruise control. This problem has been happening since the car was brand new and the ...
     
    0 answer
  • Ldonald100
    Ldonald100 - 2004 Subaru Forester - Engine - 10/2/2013
    Why did the fan for heat and air conditioning stop working?
    125,000 miles - the output for heat, air and vent does not produce any air movement.
     
    • CVO
      10/2/2013 CVO
      1.Check the fuses F/B # 1, F/B # 2 and F/B # 17.
      2. Test the blower, apply a 12 volts direct to the blower connector and if it works.
      3. Check the blower motor fan relay.
  • samuchawe
    samuchawe - 2001 Subaru Forester - Engine - 9/29/2013
    What could make this type of the vehicle to consume more fuel even when you are driving slow at 40km/h
    100000 mileage we have changed the plugs
     
    • HouseCallAuto
      9/28/2013 HouseCallAuto
      Did you monitor fuel mileage and get a miles per gallon number?
    • Jimm
      9/29/2013 Jimm
      Here are a few engine problems that hurt fuel economy:
      - missing or defective thermostat, causing low operating temperature
      - clogged intake manifold exhaust crossover passage (for heating intake manifold)
      - engine misfire caused by bad spark plug, ignition wire, coil, dist. cap or rotor
      - late ignition timing
      - bad vacuum advance unit (common in old cars)
      - stuck centrifugal advance mechanism in distributor (needs oil occasionally)
      - bad tension adjustment of centrifugal advance springs (inside dsitributor)
      - defective oxygen sensor (causes rich mixture)
      - defective coolant temperature sensor for engine computer (causes rich mixture)
      - worn timing belt (may cause rich fuel mixture in fuel injected cars with a MAP sensor)
      - incorrect timing belt installation (timing marks should line up)
      - dirty mass air flow sensor (causes rich mixture)
      - dirty air filter (causes rich mixture at high power)
      - clogged or defective PCV valve
      - incorrect valve clearance (especially if too tight)
      - worn valve guides (makes fuel mixture too lean at low power)
      - vacuum leak from bad vacuum hoses or intake system gaskets (causes lean mixture)
      - dirty fuel injectors
      - bad fuel pressure regulator
      - bad MAP sensor for fuel injection
      - leaking intake duct between air flow sensor and throttle body
      - rusted or missing exhaust heat stove or pipe for heated air intake
      - loss of compression pressure due to worn rings or leaking valves
      - sticking EGR valve (causes rough idling and rich mixture on some engines)
      - increased exhaust back pressure caused by clogged catalytic converter, muffler or crushed pipe
      - stuck exhaust manifold valve for some engines. Intended for fast warm up.

      Other than these list of engine problems; there are other possibilities -
      fuel system leaking, low tire pressure, wheels mis-aligned, brakes dragging / not fully retracted
  • alleyneben1
    alleyneben1 - 2006 Subaru Impreza - Engine - 9/20/2013
    Timing Belt needs to be replaced vehicle has 46000 miles and is well maintained.
    Is this vehicle under recall my daughter has a 2008 and had the same problem which was covered under a Recall Notice ??
     
    • Jimm
      9/20/2013 Jimm
      Check the applicable recalls on the follwoing websites; www.AutoMD.com, www.arfc.org. Looks like there are only two (2) recalls for the 2006 Subaru Impreza - one for the air bags, and one related to the front suspension / front lower control arm.

      The timing belt replacement is usually at 60k intervals - though at 46k miles it would not hurt to replace. Be sure to go ahead and replace the water pump at the same time - the water pump is usually included in the timing components kit. Check the many on-line auto parts sources, such as; www.autopartswarehouse.com, wwwpartsgeek.com, www.autoanything.com and www.rockauto.com - to list only a few sources. For example, they (Rock Auto) list the timing component kit from around $181.00 for your vehicle. Gates part # TCKWP304A Premium OE Timing Belt Component Kit W/Water Pump; 6 Components (1 Belt, 1 Hydraulic Tensioner, 3 Idlers, 1 Water Pump)
      Keep in mind that the 2.5L flat six cylinder is an interference engine application - meaning that if the timing belt should break in operation, the pistons will contact the valves and major engine damage will occur.