Skip the auto shop - Our mechanics make house calls

Q: While driving my engine stutters and tries to cut out at 4000 rpm.

asked by on

Have no other issues than cutting out at 4000 rpm...just started about an hour ago.

My car has 183000 miles.
My car has an automatic transmission.

Hi there. The engine is cutting out for a high back pressure build up in the exhaust system. The catalytic converter or muffler could be plugged up causing the engine to create too much back pressure and when the engine is running at 4,000 rpm’s, the pressure could be too high. Check the exhaust at idle with something covering the pipe and again at 4,000 rpm’s and see if the pressure drops or stays the same. If you need further assistance with your engine stalling out at 4,000 rpm’s, then seek out a professional, such as one from Your Mechanic, to help you.

Was this answer helpful?

This may be a sign of a faulty MAP sensor. The Manifold Absolute Pressure (MAP) sensor senses engine load and generates a signal that is proportional to the amount of vacuum in the intake manifold. The engine computer then uses this information to adjust ignition timing and fuel enrichment. When the engine is working hard, intake vacuum drops as the throttle opens wide. The engine takes in more air, which requires more fuel to keep the air/fuel ratio in balance. When the computer reads a heavy load signal from the MAP sensor, it adjusts the fuel mixture to slightly more rich than normal so the engine can produce more power. The computer will then retard (back off) ignition timing slightly to prevent detonation (spark knock) that can damage the engine and decrease performance. This may also be caused by other closely related components such as a dirty or failing mass air-flow sensor, a faulty throttle position sensor or potentially a vacuum leak. I would recommend having an expert from YourMechanic come to your location to diagnose and replace your MAP sensor.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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

Get a quote

What others are asking

Q: 1990 Toyota pick up 22re I just got it in time okay soon as you touch the gas feet it dies ever time so I gave up and its set for

This is typical of a bad idle air control valve. An idle air control valve allows the engine to idle properly by allowing the proper mixture of air and fuel at idle speed. This can also happen when there is...

Q: How does the ceiling light work?

Your Accord features a number of convenience lights designed to make it easier to see inside your car in low-light situations. The ceiling light (also called a dome light) is one of these. It has three settings here: On...

Q: Hi, so my '05 nissan Altima keeps melting the no.4 ignition coil. I replace it and turn the key to the on position

From the symptoms you've describe it would appear that there is some sort of electrical issue with the ignition system. I would check all of the vehicle's grounds to make sure that the electrical system is grounded and functioning properly....

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.