Lovesubarus Posted February 22, 2012 Share Posted February 22, 2012 I have 2001 outback legacy 4cyl. I disconnected the battery and now the vehicle will not stay running. I had a check engine light on for the fuel cap I thought That is y I disconnected the battery. The check engine light is gone but the car won't run. It ran great before this 23 mpg no warning lights. Any ideas or help would be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
davebugs Posted February 22, 2012 Share Posted February 22, 2012 I'm guessing the alarm. I don't know that body style well though. You did NOTHING other than disconnect the battery? Like you didn't take the airbox loose? Quote Link to comment Share on other sites More sharing options...
ivans imports Posted February 22, 2012 Share Posted February 22, 2012 check out put of alt should be 14.20 no less than 13 ever and be carfull dont fry your ecu alternator is computer contored and dose not like voltage spikes like taking batt cable off when running not good idea Quote Link to comment Share on other sites More sharing options...
Lovesubarus Posted February 22, 2012 Author Share Posted February 22, 2012 Yes, I disconnected the battery to clear a check engine light for the gas cap. Forgot to close and drove around. The car has been running great before all of this. 155k miles not burning oil and temp is always steady. Quote Link to comment Share on other sites More sharing options...
Lovesubarus Posted February 22, 2012 Author Share Posted February 22, 2012 Oh the vehicle was not running just disconnected. Waited about 5 min then re connected. Car starts. Runs at 2k them idels and dies. I can keep it running but scared to try and drive. It any where. The check engine light does not come on when the car starts to choke out. Fuel pressure is good I can feel the line and good gas flow Quote Link to comment Share on other sites More sharing options...
nipper Posted February 23, 2012 Share Posted February 23, 2012 Check alt output at 1800 RPM and battery condition. Below 1800 the alt doesnt do much as far as output. Otherwise a huge vacume leak, like an unattached hose. Quote Link to comment Share on other sites More sharing options...
Lovesubarus Posted February 23, 2012 Author Share Posted February 23, 2012 Ok thanks wii do. Could there be a computer problem Quote Link to comment Share on other sites More sharing options...
nipper Posted February 23, 2012 Share Posted February 23, 2012 Doubt it as computers rarely go bad. Check the hose under the air box, thats a popular source of things like this. Quote Link to comment Share on other sites More sharing options...
Lovesubarus Posted February 23, 2012 Author Share Posted February 23, 2012 Thanks for all the help. Still not running right. My handy work has landed me a tow to the shop. Hard to believe disconnecting the battery would cause so much trouble Quote Link to comment Share on other sites More sharing options...
nipper Posted February 23, 2012 Share Posted February 23, 2012 Probably just a coincedence. Quote Link to comment Share on other sites More sharing options...
NoCo Posted February 23, 2012 Share Posted February 23, 2012 ive seen fuel pumps fail like this they will start the car and run it for a few then as it warms up i fails. when it fails see if you can start the car on carb cleaner. if you can then you are not getting fuel. doesnt mean it is nessicarily your pump it could also be your regulator. well its at the shop now. tell us what they find. if it is your pump it is a pretty quick and easy job. last one i did took me 30 mins Quote Link to comment Share on other sites More sharing options...
stevetone Posted February 23, 2012 Share Posted February 23, 2012 review what nipper said. my money's on his diagnosis Quote Link to comment Share on other sites More sharing options...
nipper Posted February 23, 2012 Share Posted February 23, 2012 ive seen fuel pumps fail like this they will start the car and run it for a few then as it warms up i fails. when it fails see if you can start the car on carb cleaner. if you can then you are not getting fuel. doesnt mean it is nessicarily your pump it could also be your regulator. well its at the shop now. tell us what they find. if it is your pump it is a pretty quick and easy job. last one i did took me 30 mins I would still like to know the original cause for failure. Has anyone done a fuel pressure test and tested the pressure regulator? A bad regulator can cause this too, but first the simple (read free) check of the hoses. Quote Link to comment Share on other sites More sharing options...
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