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1999 subaru hesitation

I have a 1999 twin turbo subaru B4, its got the factory EJ20TT in it. Upon acceleration it jerks/bucks/stutters around the 2000-3000rpm mark then gains power. Any sugestions as to what might cause this? I have cleaned the MAF sensor, replaced the O2 sensor, replaced the air filter, changed the oil and filter, now I'm running out of ideas?? Could it be something like the knock sensor? though there are no engine noises. could it be related to my holes in my exhaust? The CEL comes on intermittently but went away for a bit when i replaced the O2 sensor, however, now its back.

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I have similar problem with my 1999 b4 twin turbo auto. it happened after changing the knock sensor. other than this jerking the car gains power after and runs very well. but the jerking is annoying. No warning signs in my car dash though it burns well1999 subaru hesitation  - 3f396f6a-4d54-4351-9bfa-47d0ca43b218.jpg

Posted on May 09, 2014

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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cognac222
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SOURCE: 89 Corsica: no power, hesitates in drive, idles

Check your fuel pressure, and or injectors. You may have too much fuel getting into the engine causing it to burn rich and overheat the converters.

Posted on Apr 26, 2009

csmock132
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SOURCE: 92 Buick Le Sabre engine stumbling/hesitation

Have you checked fuel pressure? How about spark on all 6 cylinders? Maybe a coil?

Posted on Apr 29, 2009

  • 186 Answers

SOURCE: 2001 mercury grand marquis. Engine stutters or

Start car and use a squirt bottle of water to wet the wires and coil, if you see it spark or run rough one or both are bad, repair the wires first as they are more common.

Posted on Aug 02, 2009

carsandcomps
  • 722 Answers

SOURCE: I have a 1999 Subaru Legacy B4 twin turbo and the

O2 sensor. 99% of the time it's these. First, however, go to a parts dealer and ask to have the codes reset. Drive it for about 2-3 days. If it comes back on, give it another day, and if still on, have codes reset and replace O2 Sensor(s).

Let me know if I can be of any more assistance.

carsandcomps,

Guru, Premium Expert @ Fixya.com

Posted on May 21, 2010

alicantecoli
  • 22306 Answers

SOURCE: I have a ford mondeo diesel tdci 130 2ltr 20006

sounds about right for what i think it is ,now remove the EGR valve and make a gasket from a coca cola can and do not cut the middle out ,so it blocks it off completely then try it as i am almost positive this is your problem .

Posted on Apr 04, 2011

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I have a 1999 Legacy GTB manual twin turbo, I must change the engine and I don't know it'll be fine swap with ej20tt from 1996 bg5 automatic version both cas are from Japan, can some one give me advice thx


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It can be fuel pressure issue or it's the problem with accelerator pedal or its clogged filters causing there.

There are many other possibilities. I suggest you to go through the list of help links mentioned below, these will help you to confirm where the actual fault lies: -------

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http://technoanswers.blogspot.in/2012/07/2004-dodge-town-country-jerks-and.html

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http://howtobyme.blogspot.in/2012/02/headlights-flickering-and-car-hesitates.html

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http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-cable.html

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How exactly Vehicles Accelerator Pump Diaphragm Works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-pump.html

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2000 Toyota Avalon: Engine Lean Codes and Knock Sound on Acceleration?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-engine-lean-codes.html

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2004 Toyota Avensis: Acceleration And Deceleration makes noise on Front End?

http://whatisbyme.blogspot.in/2012/05/2004-toyota-avensis-acceleration-and.html

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Wheel hop under hard acceleration?

http://technoanswers.blogspot.in/2012/04/wheel-hop-under-hard-acceleration.html

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http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

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Nissan Pathfinder stalls and bucks on Acceleration?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

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Acceleration lag problem?

http://repairhelpcenter.blogspot.com/2012/01/acceleration-lag-problem.html

-------------

These details will help.

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Dec 31, 2012 | Mazda 323 Cars & Trucks

1 Answer

My truck is lagging when I drive.. Everthing works it just feels slower then normal.. It's a Chevy Tahoe 1999 2 door..


ENGINE HESITATES WHILE ACCELERATION

LOSS OF ACCELERATION


It can be fuel pressure issue or it's the problem with accelerator pedal or its clogged filters causing there.

There are many other possibilities. I suggest you to go through the list of help links mentioned below, these will help you to confirm where the actual fault lies: -------



-----------


Acceleration lag problem?

http://repairhelpcenter.blogspot.com/2012/01/acceleration-lag-problem.html

------------

Jerks and Hesitates During Acceleration?

http://technoanswers.blogspot.in/2012/07/2004-dodge-town-country-jerks-and.html

-----------

Loss of acceleration?

http://technoanswers.blogspot.in/2012/02/loss-of-acceleration.html

---------

Headlights flickering and car hesitates to start?

http://howtobyme.blogspot.in/2012/02/headlights-flickering-and-car-hesitates.html

--------

How exactly the Vehicles Accelerator Cable works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-cable.html

-------------

How exactly Vehicles Accelerator Pump Diaphragm Works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-pump.html

--------

2000 Toyota Avalon: Engine Lean Codes and Knock Sound on Acceleration?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-engine-lean-codes.html

---------

2004 Toyota Avensis: Acceleration And Deceleration makes noise on Front End?

http://whatisbyme.blogspot.in/2012/05/2004-toyota-avensis-acceleration-and.html

---------

Wheel hop under hard acceleration?

http://technoanswers.blogspot.in/2012/04/wheel-hop-under-hard-acceleration.html

--------

2009 Chevy impala accelerator pedal sensor?

http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

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Nissan Pathfinder stalls and bucks on Acceleration?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

--------

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These details will help.

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1 Answer

I have a Subaru Legacy B4 Twin Turbo 2.0ltr. It


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next check the vacuum hose to the turbo vane actuators and that the vanes are free to move
next check for loose interchanger hoses and holes in the intercooler

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1 Answer

I have subaru b4 legacy 1999 with twin turbo from Japan and I would like to increase the torque and speed. Where do I start.


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Jumping or jerking when i accelerate


I had a turbo renault , I cranked the wastegate down to increase boost and had same problem.
There was a sensor that cut the ignition if the turbo was over pressuring. Was a pretty violent jerking, felt like it was tearing the engine mounts out.

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