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 1,000 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!
  1. Home
  2. Questions
  3. While driving my engine stutters and tries to cut out at 4000 rpm.

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: My 2005 xc90 v8 just chugged as I pressed on the gas...eventually stopped an I had to restart. Is this a fuel pump problem?

Hello, thank you for writing in. Stalling like this can happen for several reasons. The fuel pump is a great assumption, but you may want to test the fuel pressure before you go ahead with replacing the pump module. You...

Q: What's involved in changing the radiator hoses?

If access is poor from above, you may get a better angle if you raise the vehicle and support it with jack stands to get to things from the bottom. I like to use a mirror to see into hard...

Q: How to replace an ignition cylinder? do I also have to replace ignition switch? cause key has a chip that's specific my dodge.

In some cases i have seen the outer ignition housing okay and just the key lock cylinder damaged. In others they damage the housing and ignition lock cylinder. In either case you cannot use your key; it will be a...

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...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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.