Q: Speedo jumping and car stutters and cuts out upon acceleration

asked by on February 28, 2017

Brand new f23a1motor-brand new tranny, new clutch, new coil pack, dizzy, ecu, tps, wires, cap, rotor. Driving along push gas pedal speedo jumps all over. Car then sputters, hesitates, cuts out. Does it more often now. Can't accelerate with any throttle pressure. Please help
My car has a manual transmission.

Mass Airflow Sensor Replacement $188.36 - $786.53 Get a Quote

What you are describing sounds like a dirty or faulty mass air flow sensor. The mass air flow sensor monitors air intake as it is mixed with fuel prior to being injected into the motor. This sensor relays vital information 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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

How do I scroll through the radio stations?
Scrolling through the radio is very easy. Simply press the Tune soft key, then use the Left/Right buttons to scroll (press the button a second time to stop scrolling), or rotate the Tune knob.
Back power window not working
Hello. If you have one window that stopped working it is typically caused by a window motor or regulator. These typically need to be replaced together. I typically remove the door panel and check to see if there is power...
A mechanic damged my car
Unfortunately, once the car leaves the shop, you do not have much recourse for this type of issue. If you are a regular customer of theirs they may help you out a little. It would be hard to prove that...
My speed isn't affected by the rise of my RPM's
Your engine is revving high due to the transmission slipping (https://www.yourmechanic.com/services/gears-slipping-when-accelerating-inspection). It should not have anything to do with the last work done. A vehicle with a slipping transmission should have the fluid level checked (https://www.yourmechanic.com/services/transmission-fluid-service) to see if it...
Do i have to buy new engine if water rusty in plugs and car won't start..
It is very common for the cylinder head gasket on these engines to leak oil and coolant. You may have to replace the cylinder head if it is damaged. If you have water mixed in the engine oil, then you...
AIR CONDITIONER IS BLOWING HOT AIR. Does this mean its the compressor necessarily?
Hello. I will be glad to help you with your Murano. A common cause of a "no cooling" condition is the system is low on refrigerant, however, inasmuch as your car is only 6 years old, if the refrigerant level...
Cam sensor problem on my 2014 Chevrolet Camaro
Hello. This can be caused by a number of issues. If the sensor clearance is not correct then this will occur. I would check this first. I would then monitor the sensor signals as that would tell me if the...
P1145 Leads to P1135
The more common causes of P1135 in the Pathfinder include: a faulty intake valve timing control solenoid bank 2; the intake valve timing control solenoid bank 2 harness is open or shorted; the intake valve timing control solenoid bank 2...
Front bumper is loose close to where headlights are on both sides can this be fixed without replacing the bumper?
Hi Amanda. Thanks for contacting us tonight about your Honda Accord. Usually when a front fender or bumper is loose, it's due to either a screw being stripped or a bracket being damaged. When this occurs, it typically requires the...

Related articles

The Best Used Cars to Buy for Dog Owners
Dog Dog owners are a special breed of drivers. When they shop for a used car they have a list of requirements that can be quite different from other drivers, which tends to make the process a bit of a...
How to Replace a Speed Timing Sensor
Some signs of a failed speed timing sensor include a Check Engine Light and poor performance. It's also known as the crankshaft position sensor.
How to Replace a Refrigerant Pressure Sensor
The air conditioning system has a refrigerant pressure sensor that goes bad when the air conditioning does not work or only works intermittently.