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Subaru engine repair questions and answers

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622 Questions
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  • jason
    jason - 1999 Subaru Legacy - Engine - 1/24/2011
    Check engine light is on and it idles but not when i give it fuel it cutts out
    my car is acting like it is flooding out unless i feather the throtle what is wrong i checked the cats the injecters and pluggs it has not been anything i have tryed
    • HPI Blitz
      1/24/2011 HPI Blitz
      Please get it scanned then post the trouble code here.
  • greg93
    greg93 - 1994 Subaru Impreza - Engine - 1/21/2011
    My car spits and sputters kinda like its not getting gas, it ideals fine but when i go to accelerate is when it starts,
    only around 2600 to 3400 rpms then it will take off as if normal. ive brout it to 5 diffrent car shops and still nothing, it will stop doing this after about 2 mins then will start again after awhile, then it will feel like something is pulling on the car, like ...
    • Nissan Technical Advisor
      Did you diagnosed already the engine with a scan tool? My idea for this is clogged PCV valve and excessive exhaust back pressure because of plugged catalytic converter. Check also the fuel pump pressure if correct and the fuel pressure regulator if defective.
  • Linda
    Linda - 1988 Subaru GL - Engine - 1/20/2011
    Why wont the left cam marks line up? Left cam wont turn,
    I am replacing the idler pully on the left side and i cant get the left cam to move. How do i get it to move to line up the marks?
    0 answer
  • Bee
    • yboy82
      1/19/2011 yboy82
      I’m not sure if it has gasket, when you remove is there any gasket? All I know is that it is equipped with a rubber cushions.
    • yboy82
      1/19/2011 yboy82
      Try to check out this link to see a list of available muffler for your vehicle
      You can call the telephone number on the upper part of the page on that link and ask more info if there is a gasket included or just a rubber cushions. Good luck.

  • ebard
    ebard - 2002 Subaru Impreza - Engine - 1/19/2011
    What is a knock sensor and whats its use
    my engine is knocking
      It allows the engine to run with the ignition timing as far advanced as possible. The computer will continue to advance the timing until the knock sensor detects pinging. At that point the computer retards the ignition timing just enough for the pinging to stop.

      A knock sensor assures that you're getting as much power and fuel economy as is possible from your engine.

      knock sensor

      The knock sensor responds to spark knock caused by Pre-detonation of the Air/Fuel mixture. As the flame front moves out from the spark plug ignition point, pressure waves in the chamber crash into the piston or cylinder walls resulting in a sound known as a knock or ping. This is caused by using a fuel with a low octane rating, overheating, or over advanced timing. Sometimes it can be caused by hot carbon deposits on the piston or cylinder head that raise compression. A knock sensor is comprised of Piezoelectric materials; Crystals that when impacted, generate a voltage (same idea as a BBQ ignitor). This voltage is monitored by the computer, and when an irregularity is detected, the computer corrects timing in VVT (variable valve timing) engines, or triggers a DTC Diagnostic Trouble Code) in older vehicles.

  • bill
    bill - 1995 Subaru Legacy - Engine - 1/17/2011
    Check engine light comes on it reads O2 sensor. Both O2 sensors were replaced also gas cap and fuel pressure regulator.
    After each fill up and about 50-60 miles the light comes on again and reads the O2 sensors Bank one. What could be the problem . Also sometimes you can go one tank of gas then the second one comes on.
    • yboy82
      1/17/2011 yboy82
      Can you please post the extracted trouble code here? When you replaced your oxygen sensors did you also check (clean if needed) the condition of your electrical connectors and check for battery voltage and ground at the electrical connectors?
  • Cj
    Cj - 1996 Subaru Legacy - Engine - 1/17/2011
    Why does my outback overheat when driving only a block or two? It will idle at normal temp for about 10 minutes.
    The waterpump, radiator cap and thermostat have been replaced. The fans both work. Tried letting any air out by running the engine without the radiator cap on. The heater does not blow hot air. There is no white exhaust or milky oil indicating head damage or a ...
      Lower Radiator Hose Collapsing -- A pinched hose (upper or lower) or a lower radiator hose that is collapsing and blocking the flow of coolant when the engine is running can cause engine overheating. The lower hose usually has a metal reinforcing wire inside that looks like a large spring. It s purpose is to prevent the hose from collapsing when the water pump is pulling water through the hose. If this wire is missing or has failed due to corrosion, the hose may collapse.
      1/18/2011 Cj
      the hoses seem to be in working order, but will double check the bottom hose. The bottom hose seems to pass water effectively, but the return hose on top does not pass enough fuid to create pressure on the hose.
      *Plugged or Dirty Radiator -- Dirt, dead bugs and debris can block air flow through the radiator and reduce its ability to dissipate heat. Internal corrosion and an accumulation of deposits can also block the flow of coolant. A good way to find internal clogs is to use an infrared thermometer to "scan" the surface of the radiator for cold spots. If clogged, the radiator should be removed for cleaning or replaced. Backflushing the cooling system and/or using chemical cleaners can remove rust and hard water scale, but may do little to open up a clogged radiator.
      1/18/2011 Cj
      if the radiator is flushed and water flows effiecently can it still be clogged?
      *Excessive exhaust back pressure -- A clogged catalytic converter will restrict the flow of exhaust and cause heat to back up in the engine. Other causes include a crushed exhaust pipe or a collapsed double wall pipe. Check intake vacuum at idle. If intake vacuum reads low and continues to drop, inspect the exhaust system.
      Overheated incoming air -- On older vehicles with a carburetor or throttle body injection, check the operation of the heated air intake system on the air cleaner. If the temperature control valve is stuck so only heated air from around the exhaust manifold is drawn into the air cleaner, it may contribute to detonation and/or engine overheating. Also check the heat riser valve for manifold heat on older V6 and V8 engines. If stuck shut, it may be overheating the intake manifold.
      *Dragging brakes -- A disc brake caliper that is sticking or a parking brake that is not releasing may be making your engine work harder than normal to overcome the friction. Check the brakes and fix as needed.
      1/18/2011 Cj
      I dont think the brakes are an issue because it will overheat after a period of time while idling only.
      *Overworking the engine -- The cooling systems in many passenger cars today are marginal and have little excess capacity to handle extra heat generated by towing or high speed mountain driving in hot weather. Replacing the original stock radiator with a larger or thicker radiator can improve cooling capacity
  • subaru
    subaru - 1996 Subaru Legacy - Engine - 1/14/2011
    How to test fuel pump?
    • Jason
      1/14/2011 Jason
      Use a pressure gauge, assuming you hear the pump hum when you turn the key.
  • joe
    joe - 1998 Subaru Forester - Engine - 1/8/2011
    Why does my car start missing and a single tapping noise when the rpms reach 5000 when the car is stationary
    i have chaged the spark plugs when im driving it gets to 3500rpm then starts missing and a bit of black smoke out the muffler and the tapping noise
    • Nissan Technical Advisor
      Engine misfire is caused by bad spark plug or wires, inspect spark plugs conditions if fouled; replace as needed. Check also the air filter if dirty and replace as required. The tapping noise is the result of low engine oil level or the oil viscosity has lost due to poor oil change intervals or the valve clearance is out of specification. Check the condition of engine oil and correct valve clearances.
    • joe
      1/4/2011 joe
      Hey thanks for that i will give that a go
      You're welcome, update me of the developments in the future.
    • joe
      1/8/2011 joe
      I have found the problem with my car it was the air flow meter have replaced and is good to feel all the power back in the throttle thanks for all the suggestions and leaves me with the valve clearence specifiation to do.
  • Corey Pine
    Corey Pine - 1996 Subaru Legacy - Engine - 1/8/2011
    Why does my Subaru not start when the engine is hot?
    When the engine is hot and I try to start my car the starter will not engage. There is a clicking but the starter is just dead. It does not necessarily happen every time but often enough for it to be frustrating. If I let the car sit for 15-30 minutes the car ...
    • yboy82
      1/8/2011 yboy82
      Did you already check the condition of your starter solenoid and starter relay?
  • tod fleming
    tod fleming - 1998 Subaru Legacy - Engine - 1/8/2011
    Engine running rough and missing with engine light on?
    i changed coil and plugs and plug wires. now getting worse and engine light on and flashing. I checked timing belt and it is in time and new.
    • yboy82
      1/8/2011 yboy82
      Did you try to diagnose your vehicle with a scan tool to determine what the stored trouble code in your vehicle is? The extracted trouble code will help you find the fault of your vehicle’s problem.
    • david
      1/8/2011 david
      ck compression
  • Karen Farber
    Karen Farber - 2002 Subaru Outback - Engine - 1/1/2011
    Why does my car stall and shake when i accelerate?
    filled up with gas when tank was nearly empty
    • david
      1/1/2011 david
      is it skipping or tires out of balance or (outofround tires)
  • ryan
    ryan - 2004 Subaru Forester - Engine - 12/30/2010
    Found oil in spark plug access hole
    • david
      12/30/2010 david
      issparkplugs in the middle of valve cover is the valve cover gasket bad leaking oil into sparkplug hole
  • glarson
    glarson - 1996 Subaru Impreza - Engine - 12/30/2010
    Speed sensor needs to be replaced
    • James Vaughn
      12/30/2010 James Vaughn
      there are several spped sensors on most vehicles. which are u referring to? wheel,trans?