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3100 in a 94 and it wont start

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glanzergtx

Post subject: 3100 in a 94 and it wont start

Posted: Thu May 14, 2009 12:52 pm

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Swapped engines on a 1994 Grand Prix with a 3100 engine. Engine will not start. Have good fuel pressure…around 43 psi, all spark plugs are firing and in correct order, took fuel injectors out and they all open up. I can spray fuel through the air intake and engine will run. Obviously it’s a fuel issue but I’m stuck where to go next. I seem to be getting 12 volts to the injectors…the ECU seems to regulate the ground to fire the injectors? Is that right? Hard to test if the injectors are actually firing because of location and cranking the engine with the manifold off and egr wide open…if you turn off fuel pump (pull relay out) something senses there is no fuel pressure and it shuts down the injector circuit and then can’t tell if injectors are actually firing….I’m close but stuck.

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Blackarrow98gp

Post subject: Re: 3100 in a 94 and it wont start

Posted: Thu May 14, 2009 1:28 pm

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Not sure if this helps, but I had a friend whose '94 Sunbird (with a 3100) wouldn't start because the oil pressure switch was leaking.

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hotrodolds

Post subject: Re: 3100 in a 94 and it wont start

Posted: Thu May 14, 2009 1:42 pm

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Yeah. Was gonna mention to look at the oil pressure circuit. If the sensor is failed, not plugged in, or what have you, the engine will fail to start.

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SleeperSE

Post subject: Re: 3100 in a 94 and it wont start

Posted: Sat Jun 20, 2009 1:10 pm

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No No if you can spray fuel in the intake and the car run then its not getting fuel which means the pumps not working or is bad.

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Mater

Post subject: Re: 3100 in a 94 and it wont start

Posted: Sat Jun 20, 2009 4:11 pm

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SleeperSE wrote:

No No if you can spray fuel in the intake and the car run then its not getting fuel which means the pumps not working or is bad.

it has fuel pressure

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hotrodolds

Post subject: Re: 3100 in a 94 and it wont start

Posted: Sat Jun 20, 2009 6:09 pm

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Pressure is not synonymous with volume, though.

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Mater

Post subject: Re: 3100 in a 94 and it wont start

Posted: Sat Jun 20, 2009 6:31 pm

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hotrodolds wrote:

Pressure is not synonymous with volume, though.

true but it would at least try to start after a few key ons and priming the system

i would check the cam and crank sensors my self. mainly becuase the engine was out

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SleeperSE

Post subject: Re: 3100 in a 94 and it wont start

Posted: Wed Jun 24, 2009 1:48 pm

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Its the pump not flowing enough flow change it and be done i had this happen with my old 92 3.1

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