Question about 1995 Subaru Legacy

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Legacy gt dtc66, bad hesitation,surging and lack of power

Vehicle exhibits terrible surge under acceleration.

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

Mmurad
  • 46 Answers

SOURCE: 1994 Legacy with 97 GTB

Have you tried checking the trottle position sensor(TPS)

Posted on Aug 16, 2008

  • 2 Answers

SOURCE: subaru legacy/liberty 2.2eng lacks power under load and cuts out

There are two common issues with the 2.2... Both relate to valve guides. If you're confident that the sensors and controls are functioning well. Knock sensor? it doesn't hurt to pull it clean its mounting surfaces and bolt before reinstalling it if you're certain that it's good - you may be retarding timing significantly if there's an errant signal there. This would be noticeable loss of power, but not "cut-outs" as in your presentation.

You may be looking at a hanging exhaust valve. The valves sometimes will 'hang' and not close as anticipated leaving you with a vicious stumble (a 4-cyl running on 3-cyl) two "causes", if you will.. The valves may just hang in the guide (sticky & tight from build-up) or the guide itself may be sliding in the head (unfortunately, a few of the 2.2's of this period do have this issue).

If you're interested in the diagnosis, you can drop the exhaust manifold at the head you can look at & compare how far the exhaust guides are protruding from the head - all of the guides should "sitck out" from above the exhaust valve the same amount -- if you have a loose guide they tend to be "out" a bit further -- The thinking on this for your symptom is that the guide will push out with the valve opening and NOT return far enough to allow the exhaust valve to fully close - the result is a loss of compression at various times/conditions that is hard to track down. The "fix" would be to R&R the offending head to press a new over-sized guide.

The other sticky valve issue is also not too uncommon, the diagnosis is less straight forward - in that you'd need to watch vacuum, power, and DTC data at the time that the this power issue occurs. Typically, I'd recommend going with a strong and safe engine-oil flush and some sort of strong induction/injection cleaning to try to loosen and remove any build-ups on the valves. Many people with the 2.2 have switched into Synthetic engine oils for this reason... Some discussioin have included a few of the "snake-oil" additives for use after the flush (the very thin "metal penetrating" kind of snake-oils get good comments in a lot of the discussions) - It's your vehicle, I find the flush and regular good oil changes can clear-up the 2.2's sticky valve issues without wondering what I've put into my crankcase.


- best of luck

Posted on May 14, 2009

  • 167 Answers

SOURCE: legacy lacking power and using lots of fuel

Are you sure its the transmission ecu that is the problem ?
Are you getting any engine ecu error codes ?
Sounds to me like its going into limp home mode.....
Crankshaft sensor ?
Camshaft sensor ?
Engine ecu ?
Thats where I would be looking ........
Looking forward to your reply.

Posted on Jun 29, 2009

jeffbvegas1
  • 520 Answers

SOURCE: 92 subaru legacy wagon engine surges while

pay close attention to the fuel filter as this is a common symptom and sign of blockage and poor fuel delivery....replace fuel filter

Posted on Sep 18, 2009

damo555
  • 231 Answers

SOURCE: car surging under light load

hi best bet would be checking all vaccum/boost lines as one maybe cracked or leaking

Posted on Apr 07, 2011

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This engine has a surge; AT 35-45mph,it's a bit more prounounced, not as bad, but still there at 60mph. As the tach goes up some, then down, so does the motor, up then back down, etc.Any ideas?


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Power surging when accelerating


Fuel pressure Normal range is 35 to 70 PSI. Without the proper fuel pressure needed the vehicle surges and looses power especially goin up hill and at WOT(wide open throttle) . Its a good call if you change full filter your going to any way. you got a surge going on. Also check the airfilter once that plugs up it will also cause the surge. Surges happen when it lacks something so your getting less of some thing

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Subaru


Are you loosing Coolant? That and if there is a chocolate color in the oil are your best indication of a blown head gasket. Usually it will force coolant from the overflow tank under acceleration if the head gasket is going bad. There are a few different things that can make it surge, Fuel delivery, timing, vacuum leak. Takes more looking to find real reason for problem. Good luck and have a good day.

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