Subaru Impreza, 2.0 litre GX Sport 2001 model non turbo

 

Loss of power at 4200 revs. Underload. Car keeps losing power when you put your foot down and revs hit 4200

 

If you put half throttle or keep under 4200 revs car runs fine. :feels like runin out of fuel,when i lift of gas its ok runs fine when i first start car,changed fuel filter put fuel cleaner in,stil the same,when i started the car in morning it pulls all the way past 6000,when warms up she starts her ************

Maybe ur not running on all 4 cylinders. You try fuel injection cleaner or sea foam.

Maybe ur not running on all 4 cylinders. You try fuel injection cleaner or sea foam.

cheers buddy will try 2moro

Over 4200. Wonder if you have a fuel back up. Is it a loss of forward motion...like the car just stops accelerating or does the engine literally cut post 4200 RPM?

When you say loss of power do you mean that the engine hesitating or is the car not moving forward?

 

If the engine is reving and the car is not moving under those condition I would says that it's the clutch. I just replace my clutch and near the end in anything but first I couldn't put the accelerator past 1/3 or it would just spin.

 

BTW if you plan to do the clutch yourself. It's easier to pull the engine or move the engine than to move the tranny. There are too many things to disconnect to move the tranny. it was a 16 hour job for me to do it via the tranny method.

 

BW

when it gets two 4200 or ther about,the car stops pullin,feels like its runnin out of fuel,but when i lift its ok

feels like its runnin out of fuel,it stutters,when i lift of just a bit

its cool,done clutch about 3months ago

feels like its runnin out of fuel' date='it stutters,when i lift of just a bit

its cool,done clutch about 3months ago[/quote']

 

DOes it idle very rough?

when was the last time fuel filter was replaced?

 

Also you might want to run a gas line conditioner/fuel injector cleaner with your next gas up.

 

DOes it idle very rough?[/quote ]it idles ok

 

DOes it idle very rough?[/quote ]it idles ok

 

ok well like the other guy said, run fuel injector cleaner, so seafoam odd to clean her up. ANd u might want to give the fuel filter a shot.

I feel very confident saying it's a mass airflow sensor.

I feel very confident saying it's a mass airflow sensor.

 

well lets ask a question, do u see a check engine light? And try unpluggging the battery to reset the ECU then see if a light turns on.

I feel very confident saying it's a mass airflow sensor.

Always jumping to the expensive parts, eh? :-p

 

When my MAF was breaking, it exhibited all kinds of symptoms, including power loss - at all ends of the RPM spectrum however.

 

Ericem, broken sensors don't always throw codes. My MAF didn't throw a code until I physically broke it and it was performing incorrectly for a week before I blew compressed air into it and broke it.

how old are plugs/wires/fuel filter?

When I bought mine it ran like crap, wouldn't rev past 5k without sputtering. New plugs/wires/fuel filter and it revs past redline easily.

The reason why I say mass airflow sensor, is that when the ECU gets a bad reading from that sensor, it goes into a kind of "safe mode" and does not let the engine rev past a certain RPM. It's usually 3k rpm, but each car has its own little idiosyncrasies, so yours might allow it to go to 4k rpm.

The reason why I say mass airflow sensor, is that when the ECU gets a bad reading from that sensor, it goes into a kind of "safe mode" and does not let the engine rev past a certain RPM. It's usually 3k rpm, but each car has its own little idiosyncrasies, so yours might allow it to go to 4k rpm.

 

I agree, your in limp mode. This happens because of a major emissions fault, or a vehical speed sensor is dead.

 

Does your CEL work when you first start the car?

 

nipper

Maybe ur not running on all 4 cylinders. You try fuel injection cleaner or sea foam.

when i first start car it runs good,got new filter and fuel cleaner.

When you first go to start the car... do you see the CHECK ENGINE light come on and then go off once the engine has started?

 

How old is your exhaust? Possibly a broken up cat?

 

And if you pull fine with half throttle, but it won't go at full throttle I would suspect the engine running too rich. O2 sensor?

When you first go to start the car... do you see the CHECK ENGINE light come on and then go off once the engine has started?

 

How old is your exhaust? Possibly a broken up cat?

 

And if you pull fine with half throttle, but it won't go at full throttle I would suspect the engine running too rich. O2 sensor?

engine light ok,changed the fuel filter,put fuel cleaner in stil the same,but when i start it in morning it pulls all the way two 6000+

when was the last time fuel filter was replaced?

 

Also you might want to run a gas line conditioner/fuel injector cleaner with your next gas up.

done the fuel filter,put fuel cleaner in still the same,but when i started it in morning it revs ok,its like when it gets hot thats when she starts splutering,,i can get it 2 go over 4200revs,but i hav 2 gently lift of and gently put back down.

i think there is a sensor problem here. Lets wait for people better educated with sensors.

I stand by subyluvr2212 with the MAF assessment.