Question about 2001 Subaru Impreza

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Misfire codes just bought a 2001 impreza rs 2.5 and when engine is cold it runs fine, but after warming up, check engine light comes on (with misfire and rich fuel codes) and runs horrible at low to mid rpm. Thought of plugs and wires but other than that have no ideas...HELP!

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I have a similar problem, engine management shows code P0327, knock sensor 1 dont know what that is.

Posted on Sep 13, 2008

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Engine miss when cold, engine light on, new gas, air filter. fuel pump in tank. hot engine loght goes on off, when off at stop stalls out engine light off.


Diagnose Engine Misfire - Auto Diagnosis Repair Help

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Dec 16, 2015 | Cars & Trucks

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Check engine light on occasionaly


check the reason for the engine light coming on as it is serious and not to be ignored. Run fault codes.

Feb 24, 2014 | 2000 Subaru Impreza

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2000 tundra v6 5-speed cold start truck runs great, park it for 20-30 min it will start fine but after going 1/4 mile it dies, looses power. pull over and it will backfire and sputter until it eventua


bad need of a tuneup? like new spark plugs, ?
172 , is 02 rich/ lean warning. this one is low oxy for rich.
this code can just be a victim. for sure , with misfire.
means 02 sensor stuck at rich,
what is water temp in engine coolant, at failure? less than 150F?
could be lots of things.
leaking injectors, bad fuel.
injector sticking> causing misfire.
id use a scan tool and watch all sensor when it fails.
too high fuel pressure.
misfires cold, but only luke warm cold starts not fully cold.

just one DTC, no P0300 or 30x misfire codes, not even P0300 pendings?

Jan 31, 2014 | 2000 Toyota Tundra

1 Answer

Engine knocking at startup


bad air/fuel mixture could cause rod knock like that, which is a for of backlash or whip like action. Detonation, like very poor grade of fuel. IF your engineis running really rich, the extra rich fuel goes by your piston rings and thins out your engine oil. If you have a bad ROD bearing, it is probably TOO LATE. CLEAN YOUR THROTTLE BODY and IAC valve, since these things fine tune your FUEL/AIR mixture and PREVENT rich running. GOOD LUCK!!

Dec 12, 2013 | GMC Yukon XL Cars & Trucks

1 Answer

I have a 95 Ford F350 with the 460 motor. It started running fine when cold but after it warms up it starts to run rough, lose power, and runs REAL rich. I'm only getting a little more than 2mpg.


It Sounds like it is staying in the "cold start" routine. It also sounds like the diagnostic computer is not working right, because it must be rich and the O2 is not telling you a thing.

I would start by looking for a temperature sensor. You may have 2, with 1 being for the dash and the other being for the engine controls. You want to replace the temperature sensor for the Engine controls. This will help get it out of "cold start" routine.

Change your thermostat. The onboard computer does not monitor operating temperature.

Fuel pressure regulator. Have pressure checked.It could be forcing too much gas in each time an injector opens.

If you can not do this yourself, tow it in. At 2 mpg it may be cheaper to tow it than to drive any distance for repair. The Mechanics are going to need some gas left over in it to work on the engine.

Also turn on ignition and energize the fuel pressure, check for leaking fuel lines. Put on fuelcap locks if fuel drops when parked.

For this much of an extreme problem, I would like to know what you find wrong with it. I hope my solutions help.

Sep 20, 2012 | 1995 Ford F350

1 Answer

I have a 92 yj 2.5l 5 speed. it has only after warming up a misfire/rough idle. its fine when its cold and once it warms up and idle comes down it misfires/idles really rough. may be lacking power also. i...


check that the EGR valve is not sticking or has a vacuum leak. This valve will not operate until the engine is warm.

check also the engine coolant temp sensor (ECT). This sensor tells the engine computer that the engine has warmed up, so if it is faulty, it could be sending wrong information to the computer. If the sensor is disconnected, wires to it broken, or faulty in full cold mode, it will tell the computer that the engine is very cold, like -40F. The computer will schedule fuel for cold conditions. This is usually way too much fuel for a warm engine and it will rich misfire, idle rough, and be difficult to start warm.

The ECT has two wires going to it and is dedicated to sending information to the engine computer. It has nothing to do with your dash gauge that shows coolant temp. That sender has only one wire and is dedicated to the coolant temp gauge.

Feb 21, 2011 | 1993 Jeep Wrangler

1 Answer

I have a 1992 Legacy that I have to hold the gas pedal to the floor to get it to start.


Okay. If the problem occurs when the engine is cold, check for leaking fuel injectors by doing a fuel system pressure bleed down test. A leaking injector will drip a lot of extra fuel into cylinder and cause it to rich misfire until enough air can mix in to lean it out. (Which you are supplying with wide open throttle). If the problem occurs mainly with the engine warm, check the engine coolant temp sensor and the intake air temp sensor. If either of these sensors is stuck at full cold, the computer will send too much fuel to the injectors for a warm start and again flood the engine.

Feb 06, 2011 | 1997 Subaru Impreza

2 Answers

2001 Pontiac Montana - what is a misfire #5?


Without your actual trouble code, I am assuming that you are have a misfire on cylinder # 5. The computer cannot really tell what is causing the misfire only that cyl 5 is not putting out full power. If it misfires when cold then smooths out as it warms up, I would say it is probably an injector that is sticky, as it warms up it starts working properly.

Apr 29, 2010 | 2001 Pontiac Montana

1 Answer

I have a 2006 impreza rs , the car started


the check engine flashing means the engine is misfiring and can cause catalyst damage ,have it looked at right away,lots of problems with ignition coils and ignition wires causing misfires

Aug 10, 2009 | 2006 Subaru Impreza

1 Answer

I have a renault clio 1.4 R reg it misfires


misfire could happen if you have a leak in the intake or exhause valve , or if your engine running rich thats mean too much fuel coming to the engine . you should check oxygen sensor

May 31, 2009 | 2005 Renault 181

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