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1995 chevrolet corssica with 3.1 engine has not been started in 8 months now it will start then shut off.


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what do i do next
User

Nov 3, 2012, 12:46 AM

Post #1 of 15 (1666 views)
post icon 1995 chevrolet corssica with 3.1 engine has not been started in 8 months now it will start then shut off. Sign In

First i checked the fuel pump and it wasn't working so i replaced it. That is when i finally got the engine to start, but it only ran for a second then died, so i checked the fuel pump pressure it has 40lbs psi at the engine. After that i pulled all the injectors out while still attached to fuel rails and had someone spin the motor over, and fuel was coming through every injector, so i put everything back and it was still doing the same thing.
I can pour fuel into an intake line and the motor will run and it holds 40lbs of pressure at the engine while running. It acts like the injectors are switching off as soon as the engine starts up. I also replaced the crankshaft sensor. Is there another sensor or relay that would cause the injector to stop getting power after it first starts up or maybe a safety device that is not working properly? Please help me i have already called chevrolet dealer and talked to their techs and they were no help. I would really appreciate any advice. Thank you!!! also when I hooked it up to scanner i don't get any codes.


(This post was edited by what do i do next on Nov 3, 2012, 12:52 AM)


Hammer Time
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Nov 3, 2012, 3:13 AM

Post #2 of 15 (1595 views)
Re: 1995 chevrolet corssica with 3.1 engine has not been started in 8 months now it will start then shut off. Sign In

I don't see much info on what security system that may have if any. Do you have a security light on or flashing anywhere in the car when trying to start it?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



what do i do next
User

Nov 3, 2012, 12:07 PM

Post #3 of 15 (1562 views)
Re: 1995 chevrolet corssica with 3.1 engine has not been started in 8 months now it will start then shut off. Sign In

No there is no security system and i have also checked for pulse at injectors while engine is running while pouring gas into intake line and the injectors are getting power.


Hammer Time
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Nov 3, 2012, 12:09 PM

Post #4 of 15 (1558 views)
Re: 1995 chevrolet corssica with 3.1 engine has not been started in 8 months now it will start then shut off. Sign In


Quote
i have also checked for pulse at injectors while engine is running while pouring gas into intake line and the injectors are getting power.


Are you saying that they are getting power supply but no pulse?

It's beginning to look like a bad PCM but you have to carefully verify all the power and ground feeds to the PCM first.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



what do i do next
User

Nov 3, 2012, 6:37 PM

Post #5 of 15 (1540 views)
Re: 1995 chevrolet corssica with 3.1 engine has not been started in 8 months now it will start then shut off. Sign In

If I have to replace the PCM do I have to have it flashed or can I just put the old prom out of the old one?


Hammer Time
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Nov 3, 2012, 6:42 PM

Post #6 of 15 (1538 views)
Re: 1995 chevrolet corssica with 3.1 engine has not been started in 8 months now it will start then shut off. Sign In

You are in a transition year so you have a bit of a hybrid system. You have an OBD2 connector with and OBD1 computer. OBD1 uses PROMs and OBD2 uses flashing so you should have a replaceable prom.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



what do i do next
User

Nov 6, 2012, 5:18 PM

Post #7 of 15 (1511 views)
Re: 1995 chevrolet corssica with 3.1 engine has not been started in 8 months now it will start then shut off. Sign In

I have changed the PCM and still have the same problem. The engine will start and run for a few seconds then die. It acts like once the engine starts it runs out of fuel but the fuel pressure only drops from 40 to 38 lbs psi at the fuel rail.


Hammer Time
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Nov 6, 2012, 5:24 PM

Post #8 of 15 (1507 views)
Re: 1995 chevrolet corssica with 3.1 engine has not been started in 8 months now it will start then shut off. Sign In

That looks like your problem. The spec is Ignition ON Engine OFF 40.5 to 47.0 psi



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



what do i do next
User

Nov 6, 2012, 5:38 PM

Post #9 of 15 (1503 views)
Re: 1995 chevrolet corssica with 3.1 engine has not been started in 8 months now it will start then shut off. Sign In

I have replaced the fuel pump twice just in case but they both only give me 40 psi


Hammer Time
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Nov 6, 2012, 5:42 PM

Post #10 of 15 (1496 views)
Re: 1995 chevrolet corssica with 3.1 engine has not been started in 8 months now it will start then shut off. Sign In

Momentarily pinch off the return line with the pump running and see what the pressure does. It should spike to around 60 or better.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



what do i do next
User

Nov 6, 2012, 6:22 PM

Post #11 of 15 (1492 views)
Re: 1995 chevrolet corssica with 3.1 engine has not been started in 8 months now it will start then shut off. Sign In

ok thanks i will try that and let u know tomorrow.


what do i do next
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Nov 7, 2012, 5:21 PM

Post #12 of 15 (1473 views)
Re: 1995 chevrolet corssica with 3.1 engine has not been started in 8 months now it will start then shut off. Sign In

I pinched off the return line and i got 75 psi spike any ideas? It will only run for about 5 seconds then die.


Hammer Time
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Nov 7, 2012, 5:24 PM

Post #13 of 15 (1466 views)
Re: 1995 chevrolet corssica with 3.1 engine has not been started in 8 months now it will start then shut off. Sign In

That indicates that the pump is good and the regulator is bypassing.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



what do i do next
User

Nov 7, 2012, 5:44 PM

Post #14 of 15 (1459 views)
Re: 1995 chevrolet corssica with 3.1 engine has not been started in 8 months now it will start then shut off. Sign In

I pulled the injectors out again while still connected to the fuel rails and sprays fuel through the injectors while engine is spinning but when i put it back together it starts and runs for about 5 seconds then dies. As long as i pour gas through an intake line the engine will continue to run so that tells me that it must be a fuel problem but the injectors are working when they are out of the engine!


Discretesignals
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Nov 7, 2012, 7:03 PM

Post #15 of 15 (1452 views)
Re: 1995 chevrolet corssica with 3.1 engine has not been started in 8 months now it will start then shut off. Sign In

What does the fuel smell like? Maybe you have bad gas?





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