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Will not start without depressing the gas peddle

Tiny
AJRACEREX
  • MEMBER
  • 1996 CHEVROLET MONTE CARLO
  • 197,000 MILES
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.
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Saturday, June 23rd, 2012 AT 9:32 PM

17 Replies

Tiny
AJRACEREX
  • MEMBER
  • 25 POSTS
As an update, the car now has 205,000 miles and is the 3.1L V6.
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Saturday, June 23rd, 2012 AT 9:33 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the coolant temperature sensor and the fuel pressure if its within specs-start here
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Saturday, June 23rd, 2012 AT 9:37 PM
Tiny
AJRACEREX
  • MEMBER
  • 25 POSTS
Just out of curiosity, why would it be a coolant temperature sensor? What does it do that makes the car just die like that?
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Saturday, June 23rd, 2012 AT 9:40 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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
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Saturday, June 23rd, 2012 AT 9:46 PM
Tiny
AJRACEREX
  • MEMBER
  • 25 POSTS
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.
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Saturday, June 23rd, 2012 AT 9:50 PM
Tiny
AJRACEREX
  • MEMBER
  • 25 POSTS
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?
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Saturday, June 23rd, 2012 AT 11:02 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Your fuel pressure is in the low side-should be 41-47 psi-also check the fuel filter
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Saturday, June 23rd, 2012 AT 11:40 PM
Tiny
AJRACEREX
  • MEMBER
  • 25 POSTS
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.
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Saturday, June 23rd, 2012 AT 11:48 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
The idle control motor is a common failure for this condition. You should have it checked to see if it is working correctly.

Roy
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+1
Sunday, June 24th, 2012 AT 12:02 AM
Tiny
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  • MEMBER
  • 25 POSTS
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.
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Sunday, June 24th, 2012 AT 12:07 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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
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Sunday, June 24th, 2012 AT 12:13 AM
Tiny
AJRACEREX
  • MEMBER
  • 25 POSTS
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.
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Sunday, June 24th, 2012 AT 12:19 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
No, a scan tool like the modis from snap on would work fine

Roy
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Sunday, June 24th, 2012 AT 3:26 AM
Tiny
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  • MEMBER
  • 25 POSTS
Unfortunately, I don't have the money for such equipment. Where would I go to get it scanned? Dealership, autozone, etc?
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Sunday, June 24th, 2012 AT 3:49 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Auto zone, Advance Auto, Pep Boys
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Sunday, June 24th, 2012 AT 8:45 AM
Tiny
AJRACEREX
  • MEMBER
  • 25 POSTS
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!
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Monday, June 25th, 2012 AT 4:32 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Your welcome, thanks for using 2carpros and also the fix
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Monday, June 25th, 2012 AT 10:42 AM

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