Question about Chevrolet Corvette

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I replaced the fuel pump n coil. The vette fired right up then after a little while went to start it n it started n stopped then just cranked n did the same started n stopped

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  • mikey110178 Mar 13, 2011

    I already replaced the fuel pump n ignition coil. It's fuel injected.

  • mikey110178 Mar 13, 2011

    Also noticed security light sometimes

  • mikey110178 Mar 13, 2011

    YES IT IS STOCK N IS A 93!

  • mikey110178 Mar 13, 2011

    ANYONE HAVE THIS PROBLEM BEFORE WITH SAME YEAR VETTE

  • mikey110178 Mar 13, 2011

    No ses light! Started right up this morning n shut it off n on a few times n started n now it won't fuel pressure at rail is 40-45

  • mikey110178 Mar 14, 2011

    There is no check engine light on. The asr light comes on n won't start till it goes off

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  • Chevrolet Master
  • 19,396 Answers

Hi Mikey.

There may be different reasons for the shut down. Please remem

If the engine starts and turns off after revving for few seconds, then there is often a problem with the fuel injected in cylinders. The engine is chocking, either because the mixture injected is incorrect (lean or rich), because there is incorrect fuel pressure to injector, or because of an electronic problem.

If the check engine light on the dash is turning on, there are diagnostic trouble codes stored in the PCM (main computer module). Before doing anything else is good to do a code scanning. If the vehicle was built after 1995, this can be done using a common OBDII scanner like this:Trouble Code Reader.
If the car starts, the scan can also be done for free at Autozone.
If there is a code stored, this can put you on track and help finding the fault

The first things I would check are injectors and fuel pressure. Injectors are tested using a noid light to check power to injectors, and checking spray. Fuel pressure is tested using a gauge in the port located on fuel pressure rail. You check pressure, and observe how pressure goes down after turning off the engine. You may found obstructions or a pressure regulator problem even if pump has been replaced. Here a complete kit including gauge and noid light: SG Tool Aid 36200 Kit.

Those are kind of preliminary tests. Now check the common faults that often cause your problem:

Check the wiring to crank sensor and the sensor itself. The sensor voltage is of the order of two hundreds millivolts. The crank sensor failure usually stores different error codes in the PCM.

If you haven't done it yet, ensure that all cylinders are sparking. This can be done disconnecting wires to spark plugs one at the time, and observing how the engine goes.

Common faults that can cause shutdown because of an incorrect mixture are the following:

Check MAP or MAF sensor (depending on the engine), and check IAT (idle air temperature) sensor if present. This sensors determine how much air is mixed with fuel. If they are dirty or defective, the engine may choke shortly after starting. Check also the air intake and filter.

Check the vacuum. If there is a vacuum leak, then the engine aspires air through the leak, and the mixture will be lean, with engine turning off. Vacuum is tested with the same gauge used for fuel. Place gauge in middle of vacuum lines and spray carb cleaner on the vacuum hose. If pressure goes up a bit, then there is a leak.

Check EGR valve. An EGR valve stuck open will result in a rich mixture because too much recirculated gas is allowed into the engine. Often the engine revs up and turn off.

Check IAC (idle air control) valve. A defective IAC system will idle too low and the engine turns off.

There are less common failures causing engine to turn off. First do a code scanning and check all the above. The code returned by the scan may already be enough to identify the problem.

Regards.

Ginko.

Posted on Mar 13, 2011

  • Ginko
    Ginko Mar 13, 2011


    About the check engine light coming on, do a code scanning. A basic code reader is available at about $30. Once you have the error codes you will have already an indication on where to start testing.

    Regards.

    Ginko.

  • Ginko
    Ginko Mar 14, 2011

    Hi.

    The ASR senses drive-wheel slip under acceleration using signal from TPS(throttle position sensor), controlling brakes, ABS and torque converter clutch. The ASR is controlled by ECM(main computer), CCM(chassis control module), and depending on model EBTCM(Brake/Traction control module).

    Start doing a complete code scan.

    If car is pre 1995 you need to use an ALDL tool like this:Diagnostic Interface. The CCM codes are read grounding pin 12 in the interface. Here a code reading tutorial for pre-1995 Vettes.

    If car is post 1995, a general scan is done using an OBDII code reading, an additional scan must be done using a Tech 2 tool (like this http://www.gegdiagnostics.co.uk/products...">The TECH2). The tech 2 is expensive, and the scan is usually better done at the dealer place.

    The codes will tell you where to start.
    Check brake system electronics. Check connectors to ABS. Check brake lights and Wiring. Check all fuses and relays.
    Check the TPS. Use an Ohm meter to test it.
    Check wiring to ECM.
    In some case you need to replace ECM.

    Regards.

    Ginko.


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  • Master
  • 4,472 Answers

Is the is carburetor or fuel injection? Have you checked for you fuel pressure. Could be a fuel pressure regulator. Spark, fuel, and air are the main things a car needs so start from the simple things and go from there.
Thanks,
Lee

Posted on Mar 13, 2011

  • 1 more comment 
  • Lee A.
    Lee A. Mar 13, 2011

    Is this a stock security system. Also what year is the vehicle? The security light could definitely have to do with this issue. You could still have a fuel pressure issue. That is why I would check the fuel pressure at the rail.
    Thanks,
    Lee

  • Lee A.
    Lee A. Mar 13, 2011

    It wouldn't start at all if it was the VATS. It could be a problem with your ECM. Does the SES light ever come on? Here are a couple pdf's that should help you:

    VATS: http://members.shaw.ca/dankai/Vats%20Ele...

    NO SES light: http://members.shaw.ca/corvette86/No-Ser...
    Please take the time to accept/rate my solution accordingly.
    Thanks,
    Lee

  • Lee A.
    Lee A. Mar 13, 2011

    Then follow those steps on the second pdf.
    Thanks,
    Lee

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