Question about 1991 Subaru Legacy

1 Answer

Will the knock sensor make any difference to the way the car runs? it has a crack in it.

The check engine light comes on and goes off. the knock sensor has a crack in it, so the local mechanic put it on a diagnostic scanner and everything came out okay?? it recently had a new battery fitted and the codes may have been lost. when the reeves are up it runs fine, but when the reeves are down it is really rough like it is trying to run over lumps. also as we have not had this car for long, where are the fuel filters located? thank you

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Contributor
  • 58 Answers

Your car is not OBD-II, some dealers still have the Subaru Select Monitor required, some haven't kept them. Your local mechanic is unlikely to have spent $2,000 for a tool that only works on 15 to 20 year old Subarus. You can read the check engine light codes without any special tools though, see http://legacycentral.org/library/literature/codes.htm

The fuel filter is right next to the windshield washer fluid tank.

Posted on Mar 21, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

2 Answers

I have a 2005 mercury sable the. check engine light came on. I took it to AutoZone and the readings said it's running lean. Wht does that mean and what could be the cause?


It means that the engine is running lean which can cause engine knock. When the knock sensors detect excessive knock they set the check engine light.
Low fuel pressure.
Dirty fuel filter.
Dirty or bad MAF sensor.
Bad MAP sensor.
Vacuum leak.

Bad injector.

Jun 07, 2015 | 2005 Mercury Sable

1 Answer

Rapid knocking


Check for broken engine mount . Rubber is probably cracked and torn

Feb 03, 2013 | 2000 Lincoln Navigator

1 Answer

The engine light in the 2004 Envoy stays on and the reduced engine power light


You may need to find a different shop

Nothing showing up, is about as common
as any vehicle coming into a repair bay

They know you won't pay diagnostic time or believe
anything your told,so they sent you on your way

Jun 21, 2012 | GMC Envoy XL Cars & Trucks

1 Answer

2004 Toyota Camry - Check engine light has been coming on intermittently for a year. When reading the codes it states Knock Sensor and O2 Sensor Bank 1. The car is very sluggish when the light comes on....


I would tend to say the knock sensor is a result of the 02 sensor, because if it is not reading correctly it could be reporting the engine is running to rich, there for leaning out the air fuel mixture resulting in knocking which is then picked up by the knock sensor. I would start by replacing the O2 sensor in bank 1.

Sep 08, 2011 | 2005 Toyota Camry Solara

1 Answer

What octane gas should I use for a 1996 Buick Century


Most vehicles are designed to run on 87 octane, unless specified different in the owners manual. The knock sensors on your engine will detect an engine knock and advance or ****** the timing accordingly. If your engine is spark knocking, your "Check Engine" light should be on detecting a faulty knock sensor, hope this helps, Gary

Jul 27, 2010 | 1996 Buick Riviera

1 Answer

98 Nissan Maxima - Check Engine Light, Knock Sensor


If the car is pinging you will set a knock sensor code.'
This comes from bad gas and running lean., You really need this professionally inspected to rule out the basics. I have seen alot of nissans with the knock sensor code stored but the light is still off.
Fill up the tank with high octane chevron and some techron injector cleaner and clear the light. If it stays off for a couple days then go get it inspected. Even if the code is stored it will still pass as long as the light is still off and the monitors have run.

Jan 04, 2010 | 1998 Nissan Maxima

1 Answer

1997 Subaru Legacy GT 2.5L


Check the knock sensor.

The light comes on when you climb a hill, accelerate quickly or do anything that advances the timing a lot and the knock sensor doesn't hear the knocks (pinging). The engine timing is not retarded, so you get a misfire.

The computer turns off the CEL if it sees the car start and run with no misfire of this nature 4 times in a row.

Aug 21, 2008 | 1997 Subaru Legacy

Not finding what you are looking for?
1991 Subaru Legacy Logo

402 people viewed this question

Ask a Question

Usually answered in minutes!

Top Subaru Experts

yadayada
yadayada

Level 3 Expert

60867 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6811 Answers

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

Answer questions

Manuals & User Guides

Loading...