Q: Under load on the engine we already checked the mass sensor and replaced map sensor what should i I look for now I unplugged the m

asked by on

under load on the engine.it will start and drive barley. I changed the mass and map sensor but didn't change anything what do I look for now
My car has an automatic transmission.


From what you describe it would appear that you are experiencing some sort of engine performance issues. Perhaps misfires, or stalling. If you changed the MAP and MAF sensors, and the issue has persisted I would then look into the vehicle’s fuel and ignition systems. It may be possible that one of the components from these systems has failed and is causing an issue.

A few things to look at would be the fuel pump, the fuel pressure regulator, the ignition coil, and the ignition module. Another possibility is vacuum leaks, perhaps due to a bad hose, gasket, or idle air control valve. I would start with the fuel system, and go from there.

If you need help with these checks, consider YourMechanic, as one of our mobile technicians can come diagnose your loss of power and help you make the necessary repairs to get your car running normally again.

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
  1. Home
  2. Questions
  3. Under load on the engine we already checked the mass sensor and replaced map sensor what should i I look for now I unplugged the m

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: I got a motor for my truck not to long ago and the motor will turn over a little by hand but not all the way around what could it?

There are quite a few issues that will keep an engine from spinning around completely. Something falling into the intake and coming into contact with the top of the piston, a valve hanging open and not allowing the piston to...

Q: Will my 2010 Ford F150 benefit from a performance exhaust?

Warped manifolds are a well known problem on the 5.4L engine. My personal F150 has a noticeable exhaust leak from the manifolds on cold start, but goes away once the engine warms up and the manifolds expand. As for adding...

Q: I have a 98z chevy pickup, first thing in morning I cranks it up I hear bubbling noises in beater coil. When I put It in drive it

Hello, thank you for writing in. You are likely dealing with two separate issues. If you are loosing coolant that quickly, then you need to check for any external leaks in the system. If there are no signs of leaking,...

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...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...