will not start without depressing the gas peddle

1996 CHEVROLET MONTE CARLO
197,000 MILES
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AJRACEREX
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well, here i am again with another issue after 6 months of great running. just yesterday the car was running great, has been for quite some time, i decide to go out and when i go to leave it doesn't want to start. i gave it some gas and it started up but just shut right back off. i tried it again but i held in the throttle a little and it sounded fine, no noises out of the ordinary. so i let go of the throttle and it just dies out again, no sputtering or anything, just gradually dies out. also, if i try to drive it, it drives fine until i leg to of the throttle. i had a couple ideas, one being fuel pressure and another being maybe the throttle position sensor. any ideas on this problem would be great. thanks.
Jun 23, 2012 at 9:32 PM
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AJRACEREX
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As an update, the car now has 205,000 miles and is the 3.1L V6.
Jun 23, 2012 at 9:33 PM
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RASMATAZ
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Check the coolant temperature sensor and the fuel pressure if its within specs-start here
Jun 23, 2012 at 9:37 PM
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AJRACEREX
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just out of curiosity, why would it be a coolant temperature sensor? what does it do that makes the car just die like that?
Jun 23, 2012 at 9:40 PM
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RASMATAZ
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The CTS is like a choke on carbuerator it enriches the A/F mix on a cold starts with electronic fuel injections before the oxygen sensors controls the fuel in closed loop mode-Check the fuel pressure fuel pump could be failing or a clogged fuel filter-When you comeback give me the fuel pressure readings
Jun 23, 2012 at 9:46 PM
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AJRACEREX
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ok well my car is fuel injected. i already changed the fuel filter and there was no change. i have to get a fuel pressure gauge to check it so i'll get back with it asap.
Jun 23, 2012 at 9:50 PM
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AJRACEREX
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ok well i just got done with the test and it read a steady 40 psi while it was running. did it's normal routine as i revved it and let off. i would assume from here to go ahead with the replacement CTS?
Jun 23, 2012 at 11:02 PM
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RASMATAZ
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Your fuel pressure is in the low side-should be 41-47 psi-also check the fuel filter
Jun 23, 2012 at 11:40 PM
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AJRACEREX
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the fuel filter has already been changed and there was no change. as far as the pressure, it was the same when i changed the pump last summer and had no issues.
Jun 23, 2012 at 11:48 PM
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ASEMASTER6371
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the idle control motor is a common failure for this condition. you should have it checked to see if it is working correctly.

Roy
Jun 24, 2012 at 12:02 AM
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AJRACEREX
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idle control motor as in the idle air control valve? i can check that too. if i'm not mistaken, there is an ohm value between the connection pins that determine whether it's good or not.
Jun 24, 2012 at 12:07 AM
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ASEMASTER6371
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no, you need to verify if it is moving or not. it could be stuck in the bore from carbon build up. it could also be a bad motor. the ohm value will only verify an open circuit. it can have ohm value and still not work. it can be verified by a scan tool that can work the motor back and forth.

Roy
Jun 24, 2012 at 12:13 AM
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AJRACEREX
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ok i'll give it a look and get back to you about it. what sort of scan tool? i do have an OBD2 diagnostic tool (laptop based) but i don't think that would show it.
Jun 24, 2012 at 12:19 AM
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ASEMASTER6371
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no, a scan tool like the modis from snap on would work fine

Roy
Jun 24, 2012 at 3:26 AM
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AJRACEREX
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unfortunately, i don't have the money for such equipment. where would i go to get it scanned? dealership, autozone, etc?
Jun 24, 2012 at 3:49 AM
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RASMATAZ
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Auto zone, Advance Auto, Pep Boys
Jun 24, 2012 at 8:45 AM
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AJRACEREX
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thanks very much. i found the problem. turned out to be the IAC. i went ahead and shot for continuity and on both circuits it read open. also the pintle was all the way sticking out which didn't seem right either. i went ahead and replaced it and she started right up and running just fine now. thanks guys!
Jun 25, 2012 at 4:32 AM
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RASMATAZ
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Your welcome, thanks for using 2carpros and also the fix
Jun 25, 2012 at 10:42 AM
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