Question about 1991 Subaru Legacy

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2003 subaru legacy 2.5 code poo68

Runs rough at idle maybe map,mas,tps whitch one is the trouble maker thanks

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Posted on Jan 02, 2017

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SOURCE: trouble code 13, 1990 Subaru Justy

cmp sensor(camshaft position sensor)check the wiring harness see if its loose if not then it needs replaced thats what trouble code 13 list.

Posted on Nov 30, 2008

  • 14 Answers

SOURCE: 97 Subaru Legacy GT Alternator Voltage Output

Battery is probably on it last legs... alternator sounds normal.

Posted on Dec 26, 2008

  • 1990 Answers

SOURCE: b4 blowing plooms of smoke

Assuming that the Smoke is White or Black, You are gonna have to get an Overhaul on that Motor.

Posted on Jan 04, 2009

  • 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

  • 1 Answer

SOURCE: 1998 Subaru Legacy Outback--Rough Idle

I have the same problem!Running on three.I have checked compression,wires,plugs.Changed injecters,plugs.
3 mech.cant figuire it out???

Posted on Aug 01, 2010

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Blazer runs rough and dies out at idle.

I have to ask, how long since a tune-up? Are there any applicable trouble codes?
The basics for a rough idle, check for a leak of some kind, fuel--egr--vacuum leak.
/Clean/check the throttle body and idle air system. Check anything that has to do with airflow, maf--map--tps, where applicable.
What is year and engine size?

Apr 08, 2016 | Cars & Trucks

1 Answer

My 1999 jeep grand cherakee 4.0 idles rough what can I do.

How long since a tune-up? Any applicable trouble codes?
The basics for a rough idle, check for a leak of some kind, fuel--egr--vaccum.
Check/clean idle air system and anything that has to do with mass air flow like, maf--map--tps, something of that nature.
Does it run ok going down the highway?

Mar 06, 2016 | Jeep Cars & Trucks

1 Answer

Rough Idle Po120 code

Ok, first things first, have you calibrated your TPS correctly? Being closed throttle voltage of 0 - .459v and WOT (wide open throttle) voltage of 4.98 - 5v if so then make sure your harness and connectors to the TPS and the MAP/MAS sensors are free of corrosion and breaks, and just as important ran in the OE locations not coming into contact with any other components or wiring with in the engine compartment, and that your throttle body/plate is clean and free of gummy oil build up. Now as easy as it can be people tend to write off the part its self being the cause of there problem just because they replaced it, about 2 out of 10 parts bought from a parts store are lemons right out of the box! (AZ) so keep that in mind.
Moving on if that still does not keep the cel light from returning after cleared each time with scanner (KOEO) then it may be time to look at the corresponding sensor to the TPS which is your MAP/MAS. Because the ECU reads the reference signal or voltage returning from these to sensors as a action equal reaction, It can be confused as to which sensor is the colaprete. if you have further questions or need of assistants feel free to send me a message!

Apr 18, 2013 | 1996 Mazda Protege

1 Answer

2004 intrepid replaced MAP sensor and cleared codes. about 100 miles later drove to work, 8hrs later started it and engine started intermittently revving at idle and in gear. had to keep heavy on throttle...

TPS wears in spots and can cause intermittent problems like you described. Try turning off the car and unpluging the TPS. Start the car and see if smooths out the idle/reving problem while the TPS is unplugged. If yes replace the TPS.

Aug 12, 2017 | 2004 Dodge Intrepid

2 Answers

I have a POO68 code, what does this mean? My Durango surges when idle and now when I'm driving i have quick loses of power like not getting enough fuel for a split second.

P0068 MAP/MAF Throttle Position Correlation

That means that the Manifold Absolute Pressure data doesn't jibe with the Mass Air Flow Sensor data and the Throttle Position Sensor Data.

So, any one of these three items may be the cause of your problem.

LIkely, that the TPS is not giving accurate data, but must read codes from the computer to determine any further conclusions.

Aug 21, 2010 | 2006 Dodge Durango

1 Answer

1998 Subaru Legacy Outback--Rough Idle

I have the same problem!Running on three.I have checked compression,wires,plugs.Changed injecters,plugs.
3 mech.cant figuire it out???

Nov 21, 2009 | 1998 Subaru Legacy

1 Answer

1996 Galant runs rough until gas pedal pressed about quarter way down,then runs fine.Car is running lean.Not sure how to check if fuel pump is working correct,or maybe MAS?

You should have your TPS and EGR looked at as those cause rough idles...Other causes are bad idle air control valve, bad plugs, bad distributor cap & rotor, a bad wire, bad O2 sensor, etc...

Aug 25, 2009 | 1996 Mitsubishi Galant

1 Answer

2000 Subaru Legacy will not start

If you find that the engine is dying at intersections and runs a rough and fluctuating idle at start up, and you also sometimes lose power even though the engine is running then it is probably your Air Flow Meter or sometimes reffered to as a Mass Airflow Sensor. Eventually, as the AFM deteriates further you will no longer be able to start the engine as the ECU can no longer get accurate flow readings to work out air fuel ratios and shuts it all down to stop damage occuring. 2 ways to fix, replace AFM or upgrade your ECU to one that is capable of running MAPs for air fuel ratio, rather than using a sensor. Hope this helps.

Mar 20, 2009 | 2000 Subaru Legacy

1 Answer



Feb 03, 2009 | 1985 Cadillac Seville

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