Question about 1996 Subaru Legacy

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I have a 1996 Subaru Legacy LS Wagon. 2.2 Litre. I have been experiencing intermitent engine stumble that only seems to begin after operating at highway speeds for 30-60 minutes. Subaru dealer told me it was a bad AT Oil Temp Sensor. Replaced. Still the problem exists. Dealer then ran diagnostics and nothing showed. Dealer also test drove the vehicle and experienced stumble. No readings registered. They replaced the fuel filter. I personally replaced plug wires and plugs. Problem also exists on surface streets once the problem shows up. Surface street performance includes stalling at stop lights once the problem shows up. Car restarts but problem will persist. The best way to describe the stumble is it is similar to what happens when a car has a clogged fuel filter or is vapor locking. There is no overheat problem with the engine. All fluid levels are OK. Does anyone have any idea what the next step should be or if they have ever encountered this type of problem before? Thanks, Rick

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  • 828 Answers

If your vehicle has a MAF (mass airflow sensor), try disconnecting it and running the vehicle. If it runs ok ... suspect the MAF.

Commonly, a fault with the MAF does not cause an engine check light

Posted on Mar 07, 2017


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Posted on Jan 02, 2017


SOURCE: 1996 subaru legacy gtb

ended up being the fuel pump and the knock sensor

Posted on Sep 05, 2008

  • 104 Answers

SOURCE: Subaru Engine Vibration

I'd suspect a vacuum leak in the inlet manifold, check to see if any vacuum lines might have fallen off. This can cause a lean misfire at idle, but often it's not enough of a leak to make it lean enough to misfire at higher rpm. If a leak is not obvious, check if it is a leak by buying a can of engine start (or even CRC will do) and spray it all around the inlet manifold. If the idle smooths out while you're spraying then then goes rough again, it is a leak. By spraying in specific areas you can narrow down the area of the manifold or gasket that is leaking.

Hope this helps.

Posted on Oct 26, 2008

  • 1 Answer

SOURCE: 2001 Subaru legacy idle problem

check the IACV (idle air conrol valve) which monitors idle speed. a clean out of one is a good idea periodically either way.

Posted on Jan 19, 2009

  • 64 Answers

SOURCE: How do you replace the fuel pump in 1992 2wd Subaru Legacy Wagon

  1. Relieve the fuel system pressure.
  2. Disconnect the negative battery cable.
  3. Remove the rear exhaust pipe and muffler assembly.
  4. On All Wheel Drive (AWD) vehicles, remove the rear differential assembly and the rear crossmember. You do not have AWD so this step is not for you
  5. Remove the fuel filler cap and drain the fuel into a suitable container.
  6. Remove the fuel filler pipe protector.
  7. Raise and support the vehicle safely on jackstands.
  8. Remove the fuel filler, air vent and delivery hoses.
  9. On AWD vehicles, disconnect the air breather hoses and evaporation hose from the pipes.
  10. Support the fuel tank with a floor jack or equivalent lifting device.
  11. Loosen the attaching bolts and lower the fuel tank slightly.
  12. Disconnect the fuel pump harness

Posted on Feb 18, 2009

  • 8 Answers

SOURCE: Subaru Legacy LS 4WD won't fire

timing belt broke most likley

Posted on Jun 26, 2009

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