Q: Q: MAP sensor

asked by on

My 2001 volvo s60 has 246,000 mile on it in good condition when I drive it jerks really hard or when stop at a red light to long it jerks what can this be

My car has 246000 miles.
My car has an automatic transmission.

This may be a sign of a faulty MAP sensor as the vehicle responds adversely to a load put on the motor (i.e. putting it in gear, making turns (which makes use of the power steering pressure switch) turning on AC or engaging the brakes). 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 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 inspect your vehicle.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Q: MAP sensor

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 vehicle is shaking when I drive past 50 mph

Hi there. From the description you have given, the drivability problem your vehicle has may be a fuel delivery problem. This would account for your vehicle not wanting to start that one day. Next day, you were entering the highway...

Q: Where is the map sensor located? 2004 Volvo XC90

Hi - the mass air flow meter (MAF) is located in between the air cleaner housing, and the engine's intake manifold. It is a black plastic cylinder about the size of a large coffee cup, with an electrical connector (3-4...

Q: Hi Noe! Happy to talk with you! My 2001 Dodge Grand Caravan 3.3L V6 engin is leaking the coolant green water. i don t know where?

Hi there. It's quite possible that you have a few things going on with your Grand Caravan that are causing these issues ranging from a damaged thermostat, radiator fan motor, or even an obstruction of coolant inside the heater core....

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...