2007 Nissan Altima motor mounts are new the motor vibrates a lot went the car is in drive with the ac on went I turn the ac off it
My car has 101000 miles.
My car has an automatic transmission.
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Loose connections at the positive and negative battery terminals. Very dirty or clogged air filters can also cause your engine to underperform. Loose timing belts are another likely cause. A mechanic will check these and replace them if they appear loose and worn.
Engine problems typically mean it isn`t getting enough fuel, air or it isn`t properly charging. If the issue is at startup, you might check your spark plugs, air filters or suspect the starter is going. If your vehicle doesn`t seem to have enough juice, your battery or alternator may be on the fritz.
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It sounds like you may have a dirty or faulty mass air flow sensor. The problem this can cause may also be compounded when the engine is cold due to the change in air density in cooler weather. The mass air flow sensor monitors air intake as it is mixed with fuel prior to being injected into the motor. This sensor relays information about fuel and air temperature, air speed entering the motor and many other things to the ECM which uses this to make adjustments to fuel supply to the motor. A dirty or faulty sensor can cause an imbalanced air/fuel load to be supplied to the motor which results in an over fueling or under fueling situation depending on the conditions. This type of inconsistent fuel supply to the motor may cause a hesitation, loss of power, a jerking reaction, potentially a bit of black exhaust smoke and typically a strong smell of fuel when this sensor is malfunctioning. I would suggest having a professional from Your Mechanic come to your home to diagnose and inspect your vehicle.
If the car doesn’t crank then there is likely an issue with the starting or electrical system. If the issue began after you installed the new battery then the first thing I would do is check the battery to make sure that is holding a charge and providing adequate power. Even if the battery is new it may be possible that it is faulty.
It may also be possible that there is an issue with the ignition switch or even the starter. If there is an issue with the ignition switch then it may cut off power to the starter, resulting in a no crank condition. The same can happen if the starter or starter solenoid are bad. I would also look at the fuses and relays to make sure that none of them are burned out or bad, as there are a few that can prevent the vehicle from starting. As no-start conditions can sometimes be difficult to diagnose, I would recommend having a professional technician, such as one from YourMechanic, come to your location to diagnose the cause of the no start condition.