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Legacy 2001 MAF sensor
Posted 14 March 2013 - 12:13 AM
Any advice would be very welcome.
I will say this that I've naughtily manually increased the accelerator revs so that the vehicle won't stall. I also drove for 6 hours of rough roads yesterday as I needed transport - all with the check engine light on. The vehicle went perfectly without fault.
I did for the record connect the green plugs under the steering and do the manual fault check and count blinks on the check engine icon - there we around 5 faults - 19/21/49/51/53 and 55. Some of which don't exist.
I love my car and any help would be great. Thanks
Posted 14 March 2013 - 08:14 PM
Welcome to the USMB.
If you have a check engine light on, you're on the right track to try and figure out what codes are stored. I am pretty sure that your car should be OBD2 compliant, and if it is you should be able to read the codes with a standard code reader. Here in the states, local autoparts stores will read the codes for free. You could try this and see what codes come up. I'd then suggest pulling the battery for an hour or so to clear the codes, drive the car and then pull the codes again to see what comes back. That should eliminate any false or old codes.
Posted 14 March 2013 - 09:11 PM
in the US, 00 - 01 (maybe more years) ej25s do not have a MAF, they are MAP only.
Posted 15 March 2013 - 01:30 AM
However to confirm those results is what I'm dealing with... On the one hand the blinking check engine suggests the above faults and then this machine tested MAF to be faulty. Where to from now? Do I take a gamble and replace the MAF sensor believing that to be the cause of stalling engine? It will take a week or so to get the part
down from Kenya and at a cost I would imagine so I understandably am trying to be sure. I did for the record take out the sensor and give it a gentle clean like expressed in other forums and on the web, yet it didn't seem to help. Any further thought would be greatly appreciated!
Posted 16 March 2013 - 08:24 AM
But with the p1141 displayed, there's a good chance the MAF sensor is bad.
Make sure all of the hoses that connect to the intake tubing are tight and not split or broken. And make sure the intake tubing is not split and it clamped tightly at both ends as well.
Posted 16 March 2013 - 01:12 PM
Posted 16 March 2013 - 10:18 PM
Posted 17 March 2013 - 01:28 AM
With normal operation of the MAF sensor, if the ECU loses the MAF signal (it gets unplugged) while the engine is running the ECU will freak and cause the engine to stall immediately. If the engine does NOT stall immediately upon unplugging the MAF sensor, the ECU is already in a failsafe mode which would indicate that the MAF is bad.
If you unplug the MAF, then start the engine; the engine should run, though idle may be rough. It may lope or hunt for proper idle speed and there will be a noticeable decrease in power if trying to drive.
Posted 17 March 2013 - 01:51 AM
What else could be the problem when my vehicle which runs beautifully just won't idle and the check engine light glares at me constantly? I've as previously mentioned up'ed the revs manually so that stalling isn't as frequent... It is an automatic vehicle so I'm having to drive engaging neutral often to allow acceleration to prevent stalling.
Posted 17 March 2013 - 01:56 AM
Excuse my ignorance - my vehicle is an ej25 and is a 2001 legacy - could this sensor actually not be the MAF?
I will google the difference now! As I'm all a little lost over this matter
Posted 17 March 2013 - 03:50 PM
MAP = Mass air pressure. it measures the barometric pressure of the atomosphere and tells the computer air density. MAF is mass air flow. it meters the amount of air coming past a sensor.
Subaru used one or the other but not both from what I remember. the EJ25D (dohc engine) was a MAF engine, the EJ251 (sohc) is a MAP engine. The EJ253 went back to MAF for some reason.
If you have an airbox with a square sensor bolted to the airbox its a MAF motor. If your airbox is bolted directed to the intake and has a filter right there at the throttle body thats a MAP motor
Posted 17 March 2013 - 10:20 PM
It measures and compares atmospheric pressure and intake manifold vacuum and alters a voltage signal based on the amount of difference between the two.
Foreign market vehicles could have had different air metering systems during those time periods. They certainly had plenty of other things that we didnt get here on the US market.
Also some 95-97 cars have both MAF and MAP sensors. My 96 has both.
Posted 05 August 2013 - 08:40 AM
Posted 05 August 2013 - 08:49 AM
You may have a vacuum leak. When was the last tune up? Plugs, wires, filters, PCV valve?
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