My Question: My check engine light is on, My car shakes when I accelerate hard or on an incline? What’s wrong?

heavy engine

Question:

My check engine light is on, My car shakes when I accelerate hard or on an incline? What’s wrong?

It’s fine going slow at first and building up speed but anything heavy on the accelerator kind of jolts the car and the check engine light starts flashing but then it stays on if I’m coasting or softly accelerating.

Answer by David L
Take the car to Auto Zone for a free check engine light test.

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12 Responses to My Question: My check engine light is on, My car shakes when I accelerate hard or on an incline? What’s wrong?

  1. Mr. says:

    Probably the oxygen sensors are bad. Some cars have only 1 oxygen sensor… some have 2 or even 4 sensors. The prices go from 20 bucks to 140 each… depends on the Year-Make-Model. Theres no way to test them… but if your car is a 1996 or newer… you can take it to AutoZone have your car tested with the OBDII for free. The OBDII is going to show some codes ( starting with ‘p’ example; P1030) and an AutoZone employe can tell you what is wrong based on the specific code you got. If you car is 1995 or older you`ll probably need to buy the OBD I scanner because Autozone only has it for sale… OBD I is not a Rent-Out tool.
    good luck!.

  2. Jeremy S says:

    take it to autozone they’ll read the computer to diagnose it. sounds like egr valve. not sure.

  3. Ben says:

    Usually when an engine misfires under load it means the plug wires, coil wire or spark plugs are bad. You don’t say what make, model and year your car is but, if it’s OBDII, the check engine light could be a “random misfire” code.

    Give your car a good tune-up and replace the plug wires and you should be all set.

  4. krazybob613 says:

    Check Engine Light ON = Malfunction, service is needed.

    Check Engine Light FLASHING = MISFIRE = Serious loss of fuel economy + risk of engine damage + possibility of vehicle catching FIRE!

    Have your vehicle serviced IMMEDIATELY.

    DO NOT go to Autozone or any other parts store for “Free Diagnosis”, you need an experienced and qualified service technician, and you need one right NOW!

  5. Jcontrols says:

    Oxygen sensor(s) or EGR valve. A malfunctioning EGR valve will drive the MAP sensor crazy! Pull stored codes from the on-board computer to trace the location of the fault! ;-) =

  6. Jim says:

    Take it to the shop let them tell you whats is wrong if you try to guess at this you could get lucky or just spend money and have the same issue.

  7. Shandra S says:

    MY CHECK ENGINE LIGHT ON MY CAR SHAKES WHEN I SPEED

  8. Brian W says:

    STOP DRIVING IT!!! get it to advance auto or something, if the car is 1995 or newer, they can pull the engine light code for free. figure out whats up and get back to us with a code so we can help you more

  9. CARL G H says:

    alex, the check engine light not being constant is curoius. your description is that of fuel starvation. the engine has spark as you are still running and didnt ever say it stalled out loss of air supply when moving is not likely almost impossible (almost!) I had this happen to me with a slightly pinched fuel line once when I was changing Holly carbs on my big block. Idle was fine cruise fine romp the pedal and real quickly no power. I wonder if you could just need a new fuel filter many newer cars have this part neglected by the service shops. the computer may or may not have stored the codes from this because it goes off . I do suspect its fuel delivery related but it could be as simple as the fuel cap is plugged and not venting the system

  10. bobweb says:

    Sounds like an engine misfire. The first to check is the spark plugs and spark plug wires. Replace the wires if they’re over 10 years old for sure.

  11. mdk68gto, too long in the garage says:

    knock sensor.

  12. Tex G says:

    The check engine light is telling you have a misfire on a cycle. Since you did not give the year and make. There are several items that will cause the misfire. The worse is lack of compression on a cycle. It rebuild of the block. The is a valve not seating tight, which means the head has to come off and costly mechanic shop work if the mechanic does do it him self. The latter items come be replaced in a major turn-up. Cap, Rotor if it has one, wires, spark plugs, fuel filter and the coil or coil pack. Some engines has the coils and wires build into the valley cover. A computer check will give you most of what has to be done. Cause there are Electro items that cause these thing as well.

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