mccracken Posted June 27, 2012 Share Posted June 27, 2012 I have a 1999 Forester that when cranked will start and idle, stalls and will restart and idle for approximately 10 seconds and stalls again. It seems to be running out of fuel and the tank is very near full... Anyone run across this before? Link to comment Share on other sites More sharing options...
nipper Posted June 28, 2012 Share Posted June 28, 2012 Remove the gas cap and then try starting the car. Link to comment Share on other sites More sharing options...
JPX Posted June 28, 2012 Share Posted June 28, 2012 I'm thinking fuel pump is acting up. But perhaps a bad gas cap seal is an easier and cheaper place to start. Link to comment Share on other sites More sharing options...
nipper Posted June 28, 2012 Share Posted June 28, 2012 Actually the pumps on these things are tough, but the fuel pressure regulator can sometimes be more suspect. Try the cap first. Next get a fuel pressure gauge and see what you get at the filter. Link to comment Share on other sites More sharing options...
Fairtax4me Posted June 28, 2012 Share Posted June 28, 2012 99 has issues with the Idle air control valve. They often go bad and will cause rough idle and stalling problems, and often do not set a code. No CEL? Does the CEL work when the key is turned to ON? Checked for broken vacuum hoses or loose/ broken breather/ PCV hoses? Checked that the air box behind the throttle body is assembled properly and clamped tightly to the TB? It hinges at the bottom and can be difficult to reassemble if taken apart, it's often spit open a bit at the bottom which can cause problems. Intake hose clamped tightly at each end? Intake hose isn't broken anywhere? How old is the fuel filter? How old is the air filter? Is it full of acorns? Link to comment Share on other sites More sharing options...
nipper Posted June 28, 2012 Share Posted June 28, 2012 WHen did it start doing this ? Link to comment Share on other sites More sharing options...
CNY_Dave Posted June 28, 2012 Share Posted June 28, 2012 Does this critter have an 'accident' switch that kills the fuel pump if it thinks the car has been in an accident? Had a car once that used the oil pressure sensor for that... other cars have an impact sensor, might be the little bit the pump runs when the key is 1st turned on supplies enough pressure to idle for 10 seconds or so, but the pump never keeps running. Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted June 28, 2012 Share Posted June 28, 2012 I think fairtax has a great post. but cnydauve raise the question - somewhere there is a pressure sensor that must tell the pump to shut off. maybe it's 'on' and shuts the pump off too soon or at too low pressure. Might be worth pulling some plugs to see if an injector is leaking/stuck open. where's mccracken, he needs to come back until we ...................... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RELEASE MCCRACKEN !!!! Link to comment Share on other sites More sharing options...
nipper Posted June 28, 2012 Share Posted June 28, 2012 No subarus do not have intertia switches. Does it do the same thing no matter the air temp? I am thinking massive air leak, ie idle air valve like suggested before. Link to comment Share on other sites More sharing options...
Fairtax4me Posted June 28, 2012 Share Posted June 28, 2012 somewhere there is a pressure sensor that must tell the pump to shut off. The pressure sensor is used to determine when there is a leak in the evap emissions system. I'm not aware of any inertia switch on these cars. If there were one, it would likely cause the car to not start at all until the switch were reset. Link to comment Share on other sites More sharing options...
nipper Posted June 28, 2012 Share Posted June 28, 2012 Fuel pump is on a timer at crank. it just primes the fuel system. Once the ECU has determined the car is running the pump will run constantly. Link to comment Share on other sites More sharing options...
CNY_Dave Posted June 28, 2012 Share Posted June 28, 2012 Fuel pump is on a timer at crank. it just primes the fuel system. Once the ECU has determined the car is running the pump will run constantly. Wonder what criteria the ECU uses to determine that? Anyway, a test light/ear on the tank will tell if the pump continues to run. Link to comment Share on other sites More sharing options...
nipper Posted June 28, 2012 Share Posted June 28, 2012 What criteria, it is easy to tell if the car started, just need to read the crank sensor or tach reading. Link to comment Share on other sites More sharing options...
Fairtax4me Posted June 28, 2012 Share Posted June 28, 2012 Wonder what criteria the ECU uses to determine that? Anyway, a test light/ear on the tank will tell if the pump continues to run. An input from the starter circuit when the key is turned to the start position, and tachometer signal. It doesn't NEED the start signal input, it just changes a few things (timing,IAC position, fuel input). Link to comment Share on other sites More sharing options...
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