Skip the auto shop - Our mechanics make house calls

Q: Hello i have a ford focus c max 2004 yesterday there was a problem when i was on motorway the car slow down and in 5th gear with

asked by on

Hello i have a ford focus c max 2004 yesterday there was a problem when i was on motorway the car slow down and in 5th gear with it was not going more than 80kms. Can u explain what should i do and what is the problem

My car has 116000 miles.
My car has a manual transmission.

A plugged catalytic converter can cause this symptom but your account seems to be that this "bogging down" problem came on suddenly. Typically, in a circumstance such as yours, we recommend you request a slow acceleration diagnostic. Among the possible faults examined are a defective fuel pump, clogged fuel filter, dirty airflow sensor, vacuum leak, and so forth. There are critical sensors as well, such as the camshaft and crankshaft position sensors, that can cause acceleration problems. With regard to the fuel system, faults there could cause too little fuel to be supplied to the injectors and this can cause the vehicle to accelerate slowly, or even sputter and stall, especially at high speeds. The airflow sensor detects the mass of air that enters the fuel injection system and hands that information off to the engine’s computer which allows the computer to deliver the proper amount of fuel to the air. These sensors can become dirty or malfunction over time, which results in the wrong data being sent to the computer. A slow accelerating car is the result of this incorrect data. An air leak in the intake system can affect the ability of the car’s computer system to properly regulate the fuel to air ratio. One of the major symptoms of a vacuum leak is a car that is slow to accelerate or feels like it has a lack of power.

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!
  • Home
  • Questions
  • Hello i have a ford focus c max 2004 yesterday there was a problem when i was on motorway the car slow down and in 5th gear with

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 car starts, I can reverse but as soon as I put it in drive it shuts off

Hello. You may have a sticking torque converter lockup clutch, or sticky solenoid for this hydraulic actuator. This would account for the "idles in Reverse, but not in Drive". A locked up converter doesn't allow the engine to idle without...

Q: Vehicle not accelerating as it should

Hello. Thankfully the Check Engine Light came on. These issues are easier to diagnose when the engine's computer has already detected what systems are showing issues. The first step is going to be to get the vehicle scanned for diagnostic...

Q: Coolant goes down, no leaks 2004 Nissan

Hi there - if the coolant level is dropping, it's either leaking somewhere that is undiscovered thus far, possibly evaporating before it is discovered, or the engine is consuming it via a blown head gasket or crack in the head...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...