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Troubleshooting Engine Performance Problems Part 7



Find possible causes of engine problems by the symptoms your car is displaying.
More...
» Part 1: Hesitation...
» Part 2: Hissing...
» Part 3: Tapping...
» Part 4: Rattling...
» Part 5: Smoking...
» Part 6: Overheats...
» Part 7: Fuel Usage...
» Part 8: Smells...
» Part 9: Surges...
» Part 10: Stalls...
 

  • Your check engine or service engine light comes on or stays on:
    This can be a very confusing situation since all manufacturers have called this light by different names. Additional confusion is caused since manufacturers have different systems that are monitored by this light. In most cases, this light is part of the electronic engine control system. When the light comes on, it means that the car's computer has detected something wrong in the control system. The lamp remains lit until the problem is corrected. In some systems, it could just indicate that there is a problem. The warning light may suddenly come on and remain on, or it may come on and go out after a period of time.

    Possible causes:
    1. The engine's computer has detected a problem in the system: Have system checked with a scan tool to determine problem. (Generally not a DIY job)

    2. The engine's oil pressure is extremely low: Stop engine and do not resume operation until cause of low oil pressure has been determined and repaired.

    3. The engine is overheating: Repair cooling system.

    ~~~~~~~~~~

  • The car uses more fuel than normal, and there is a strong odor from the exhaust:
    You notice that gas milage has gone down quite a bit. There is a strong smell like rotten eggs coming from the exhaust. You may or may not have noticed that the car doesn't have the same amount of power it used to.

    Possible causes:
    1. If you have a carburetor, the carburetor choke may be stuck closed: Repair or replace choke.

    2. The engine may have mechanical problems: Check compression to determine engine condition.

    3. The ignition timing may be set wrong: Adjust ignition timing.

    4. There may be a fault in the computerized engine control system: Check engine control systems with a scan tool. Test circuits and repair or replace components as required. (Generally not a DIY job)

    5. The engine may be running too hot: Check and repair cooling system.

    6. The fuel injectors may be stuck partially open: Replace injectors.

    7. There may be an emission-control device that is not working properly.

    8. There may be some type of ignition problem: Check and replace distributor cap, rotor, ignition wires and spark plugs.

    9. The fuel pressure regulator may be operating at too high of a pressure: Check fuel pressure with a fuel pressure gauge. Replace fuel pressure regulator. (Generally not a DIY job)

    ~~~~~~~~~~

  • Engine seems to use more fuel than normal, and there is a strong gas odor coming from the car:
    You notice that gas milage has gone down quite a bit. There is a strong smell of raw fuel coming from the engine when you shut it off. You may or may not have noticed that the car doesn't have the same amount of power it used to.

    Possible causes:
    1. The fuel lines may have a leak: Replace or repair fuel lines.

    2. The engine may have mechanical problems: Check compression to determine engine condition.

    3. The fuel pressure regulator may be operating at too high of a pressure: Check fuel pressure with a fuel pressure gauge. Replace fuel pressure regulator. (Generally not a DIY job)

    4. The fuel injectors may be leaking: Replace injectors.

    5. Gas cap may be missing or bad: replace gas cap.

    ~~~~~~~~~~

  • There is a rotten egg smell coming from the exhaust:
    Whenever you run the engine and are standing still, you notice an awful smell from the exhaust. The smell is like that of rotten eggs. Not only do you notice this, so does everyone around you as they are throwing up all over your car.

    Possible causes:
    1. There may be a fault in the computerized engine control system: Check engine control systems with a scan tool. Test circuits and repair or replace components as required. (Generally not a DIY job)

    2. There may be some type of ignition problem: Check and replace distributor cap, rotor, ignition wires and spark plugs.

    3. The fuel pressure regulator may be bad: Check fuel pressure with a fuel pressure gauge. Replace fuel pressure regulator. (Generally not a DIY job)

    4. The engine may have mechanical problems: Check compression to determine engine condition.

    5. The engine may be running too hot: Check and repair cooling system.

    6. The engine is overheating: Repair cooling system.

    More...
    »
    Part 1       » Part 2       » Part 3       » Part 4
    »
    Part 5       » Part 6       » Part 7       » Part 8
    »
    Part 9       » Part 10
    Additional Information provided courtesy of
    ALLDATAdiy.com and Warranty Direct
    © 2000-2007 Vincent T. Ciulla

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