Question about 1990 Subaru Legacy

1 Answer

Car ships replaced wires plugs o2 sencer sometimes acts like it is flooding run fine on open road.

Posted by mdmichaelray on


1 Answer

Jeremy Moore

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Subaru Master
  • 1,940 Answers

If it acts like it is flooding while idling, but it runs fine on the road, it could be running too rich and flooding it out due to leaking injectors, bad fuel pressure regulator, or excessive fuel pressure.

I would start by replacing the Fuel Pressure Regulator since it doesn't cost as much as the injectors.
Check your fuel pressure using a Fuel Pressure Check Gauge to see if the fuel pressure regulator is maintaining the proper pressure.

Vacuum is attached to the Fuel Pressure Regulator to control system pressure. When the fuel pressure regulator is not functioning properly it causes the fuel pressure to be above normal operating pressure. This condition causes excess fuel to be injected causing a rich mixture that produces black smoke.

I’m happy to help further over the phone at

Posted on Feb 16, 2011


Add Your Answer


Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

What causes my 1995 chevrolet lumina with a 3.1 v6 to act like it's misfiring at 50-60 mph?

run the fault codes and check for O2S sensors and failed cat converter

Aug 30, 2014 | 1995 Chevrolet Lumina

1 Answer

1995 sl1

replace ignition coil

Jun 20, 2013 | Saturn Cars & Trucks

2 Answers

I have a 2004 optima with 186000 miles the ck engine light is on put computer on it and it says that the oxygen sencer or the cat converter is bad, the light has been on about a mouth but now the car runs...

hi you have 2 of these sensors on the exhaust system, the first is on the exhaust manifold on the engine, just locate this and follow it down and you will come to what looks like a bolt with wires sticking out of it, that is the first one, the other one, will be just before the cat it will look the same as the first one, so if you cant find the first one, look for the second one and you will be able to see what you are looking for....and yes these do have a tendency to make the car run rough at times but not all the time...hope this helps please comment and rate thank you

Feb 03, 2011 | 2004 Kia Optima

2 Answers

Replaced motor in 96 sunfire car will not run. Acts like it is flooding out. Have got it to run a few times. Changed map sensor, coil pack, fuel pressure sensor, injectors, crank position sensor, pretty...

Did the old motor run? Is this a used motor? Did you hear this motor run before you installed it? Have you tried running it with the exhaust unbolted from the manifold?

Nov 10, 2010 | 1996 Pontiac Sunfire

3 Answers

1989 Z24, 2.8v6 intermittent stalling while driving. Sometimes will restart, but not go far, sometimes will not restart at all. Usually starts fine the next day, may run OK several days before acting up...

the pcm may have a cracked board, i had an 88 cavalier z24 with the same problem, replced the ecu and it ran fine, the problem is that the boards inside the pcm crack and lose connection, the next time it acts up open the glove box and try tapping on the pcm, if the car responds at all, the pcm is bad

Jun 08, 2009 | 1989 Chevrolet Cavalier

1 Answer

My Forenza dies when I am going down the road, and runs very roughly all the time. When I stop the car will die. I have changed the spark plugs and wires and have had it in the shop many times for...

air flow or master air flow sencer is bad. im ran like **** then i replaced the sencer and it runs like a top,,it cost 190.00 to my part,i put it in myself

Jun 04, 2009 | 2004 Suzuki Forenza

2 Answers

I have a 1993 cutlass ciera s and it dies

my 93 olds stalls then dosent turn over but i take ecu fuse out and wait a few minutes it will start and run till next time it decides to stall

May 14, 2009 | 1993 Oldsmobile Cutlass Ciera

2 Answers

Replace o2 sencer bank 1 circuit 1

You should be able to reach it from the top. It is a stretch. The hardest part is getting it out. If you have the new part already you can cut the wires and use a regular socket wrench to get it off. Some like to run the engine for a minute or two before starting. Soak it with PB Blaster, wait a minute, and go at it. If clearance is an issue, try a box end wrench. The socket designed for the O2 sensor has a split in it that sometimes can spread. It is also hard to use the knuckles as they deflect a lot of torque.

Once it is removed, make sure that the paste is on the threads. This will help the next time this needs to be done. Thread it in, torque it down, and plug it in ( the plug is on the alternator bracket.)

Apr 29, 2009 | 1996 Dodge Caravan

Not finding what you are looking for?
1990 Subaru Legacy Logo

Related Topics:

406 people viewed this question

Ask a Question

Usually answered in minutes!

Top Subaru Experts


Level 3 Expert

85239 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22485 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8984 Answers

Are you a Subaru Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides