Question about 1993 Pontiac Grand Am

4 Answers

93 Grand Am 3.3, engine dies when hot

After ~8 miles in summer driven hard sputters, runs does this 3-4 times & dies. Won't start till several hours later when cool.

What's been done:
New fuel pump (1 yr old), brand new borg warner crank shaft position sensor, new borg warner ICM (and retested), new ignition coils (seperate problem).

Service engin light is on most of the time buit think this is just O2 sensor(s), computer is dumb, never turns anything up on diags.

Ran with fuel pressure gage attached through problem, pressure 47 - 60 pounds during acceleration then when sputtering jumping wildly between 20 - 50 lbs. Engine temps are normal, fan & cooling system OK, AC running OK

Any next best guess/insight welcome - I also have an 87 Jeep 4L that does the SAME THING:(

Dave64155@NKCMO.com

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  • 3 more comments 
  • Dave Rose Sep 02, 2008

    This is HEI, no distributor - fuel pressure does go up during acceleration, if this is airflow meter sensor, how do you check?



    Also additional checks done: When dead, no spark, no signals to injectors - it's like the computer shut down the engine or a critical sensor is completely offline (my guess), problem does not happen during winter when ambient temperture is 40 or less...

  • Dave Rose Sep 02, 2008

    Problem does not happen during winter when ambient temperture is ~40 or less...

    Additional checks done: When dead; no spark, no signals to injectors - it's like the ECM's down or a critical sensor is completely offline (my guess).

    No distributor on these engines - fuel pressure does go up during acceleration, MAS has been suggested but this should not cause complete engine failure should it?

  • Dave Rose Sep 02, 2008

    Problem does not happen during winter when ambient temperture is ~40 or less...

    Additional checks done: When dead; no spark, no signals to injectors - it's like the ECM's down or a critical sensor is completely offline (my guess).

    No distributor on these engines - fuel pressure does go up during acceleration, MAS has been suggested but this should not cause complete engine failure should it?

  • Dave Rose Sep 02, 2008

    Problem does not happen during winter when ambient temperture is ~40 or less...

    Additional checks done: When dead; no spark, no signals to injectors - it's like the ECM's down or a critical sensor is completely offline (my guess).

    No distributor on these engines - fuel pressure does go up during acceleration, MAS has been suggested but this should not cause complete engine failure should it?

  • Dave Rose Sep 07, 2008

    Scanned the ECU and the only fault reported (during or outside of this problem) is 28 - Gear Switch Circuit.

    The Mas Airflow Sensor is clean and checks good, air intake and filter are clean, injectors are clean & tested, all the spark plugs appear normal & clean.

    As stated before; this is distributorless ignition, AND the ICM (Ignition Control Module) has been tested (also a new part that did not resolve this problem).

    PLEASE keep your ignition responses limited to the GM C3I Ignition System - THERE IS NO DISTRIBUTOR on this engine. Each cylinder pair has it's own ignition coil controlled by the IM.

    The engine operates perfectly until it gets hot; smooth, no misfirings and all the power you would expect of the 3.3L

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Check the airflow meter or your fuel pressure is low - also can be caused but the oil make sure your using the right oil and change it once a year

Posted on Sep 07, 2008

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This sounds like you are not using the correct OIL or a Vacuum hose leak

Posted on Sep 02, 2008

  • Jayson Brollini
    Jayson Brollini Sep 02, 2008

    YOU Should change the OIL weight SEASON because of the Extreme Temp.

  • Jayson Brollini
    Jayson Brollini Sep 02, 2008

    Try 30 weight in the Summer and 40 in winter

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Check the airflow meter sensoe,could be distributor also if the fuel pressure is going down on acleration could be a blockage in the injectors on injector might be getting to much fuel or the airflow meteris playing up thats the best bet

Posted on Sep 02, 2008

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  • 19,396 Answers

Start checking air intake and air filter,

The ECU (car computer module) must be connected to a code reader and scanned, with engine light on, probably it is a computer problem.

Posted on Sep 02, 2008

  • 1 more comment 
  • Ginko
    Ginko Sep 02, 2008

    If you have engine light on it can be a problem with electronic controlled distribution or electronic injection, or it can be a defective Electronic Control Module (computer) in need of replacement.

    It is unlikely that this is just any ininfluent fault like the O2 sensor, as you are experiencing more engine problems.

    Fuel pressure is OK, if you already did all that work on fuel section, check distribution, rotor, rotor cap,
    see if any of the spurk plugs is getting dirtier than the others, that means distribution problems.


  • Ginko
    Ginko Sep 02, 2008

    If distribution is electronic, see if there is any misfiring problem, and check the control module.

    A way to check the map airflow sensor ispulling out the sensor cables and testing the car. If it does run fine, or even better then before, then the MAF sensor is gone.


  • Ginko
    Ginko Sep 07, 2008

    I report from you "Additional checks done: When dead; no spark, no signals to injectors " and "only fault reported is 28 - Gear Switch Circuit."

    The electronic injection and distribution are going funny depending on the weather, and scanning the ECM returns only an irrelevant error code.

    This means that the ECU/ECM module it is probably faulty and need to be replaced.


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