• SHOP
  • CLUB
0
My Garage
Add vehicle
0
items #46-5171
£ 0,00
Your basket is empty

Loss of power in car: causes and malfunctions

After driving your car on a regular basis over many months and years, you get to know it pretty well. That’s why it usually doesn’t take a driver long to spot an abnormal loss of engine power. For example, you may notice that your car feels sluggish when you’re cruising down the motorway or that it isn’t accelerating as it should be. The possible causes of a loss of engine power are numerous, but the good news is that they are treatable.

The first step to getting back on the road is to figure out why your car loses power while driving. Once you have a proper diagnosis, you can go ahead and plan the repairs, as well as figure out your budget. This guide will cover the most common causes and malfunctions related to power losses.

Why is my car losing power?

In most cases, the problem lies somewhere within the fuel supply or ignition system. In order to produce power from combustion, the engine needs a consistent supply of fuel and air. Interruptions to the flow of fuel and air, such as those caused by blockages or electrical faults, are therefore the main culprits for a loss of engine power.

4604 DENSO Nickel TT K20TT Spark plug Spanner Size: 16
Parts Details
  • Spanner Size: 16
  • Product line: Nickel TT
  • Spark Plug: 1 - Earthed Electrode, Nickel Middle Electrode
  • Thread Length [mm]: 19
  • Connector type: Solid SAE
  • Tightening Torque [Nm]: 22
  • Diameter [mm]: 14
  • Weight [g]: 43
  • for OE number: 1WT318110
  • Gross Weight [g]: 46
  • DENSO: Spark plug
  • Item number: K20TT
  • Condition: New
Details
DENSO Spark plug
Article number: K20TT
£ 4,05
(Price per item)
price incl. 20% VAT, excl. delivery costs
BKR6EQUP NGK 3199 Spark plug M14 x 1,25, Spanner Size: 16 mm
Parts Details
  • Spanner Size: 16 mm
  • Spark Plug: Platinum Middle Electrode, 4 - Earthed Electrode, Interference Suppression 5 kOhm, with gasket seat, Fixed SAE connector
  • Thread Length [mm]: 19,0
  • Spark Position [mm]: 3,5
  • Thread Size: M14 x 1,25
  • NGK: Spark plug
  • Item number: 3199
  • Condition: New
Details
NGK Spark plug
Article number: 3199
£ 10,77
(Price per item)
price incl. 20% VAT, excl. delivery costs
SILZKFR8D7S NGK 95875 Spark plug M12 x 1,25, Spanner Size: 14 mm
Parts Details
  • Spanner Size: 14 mm
  • Spark Plug: Ring type connector (cup-shaped), Iridium Middle Electrode, 1 - Earthed Electrode, Interference Suppression 1 kOhm, with gasket seat
  • Thread Length [mm]: 26,5
  • Spark Position [mm]: 5,0
  • Thread Size: M12 x 1,25
  • NGK: Spark plug
  • Item number: 95875
  • Condition: New
Details
NGK Spark plug
Article number: 95875
£ 11,29
(Price per item)
price incl. 20% VAT, excl. delivery costs
BKUR6ET-10 NGK V-Line 3045 Spark plug M14 x 1,25, Spanner Size: 16 mm
Parts Details
  • Spanner Size: 16 mm
  • Product line: V-Line
  • Spark Plug: Nickel Middle Electrode, 3 - Earthed Electrode, Interference Suppression 1 kOhm, with gasket seat, Fixed SAE connector
  • Thread Length [mm]: 19,0
  • Spark Position [mm]: 5,2
  • Thread Size: M14 x 1,25
  • NGK: Spark plug
  • Item number: 3045
  • Condition: New
Details
NGK Spark plug
Article number: 3045
£ 12,60
(Price per item)
price incl. 20% VAT, excl. delivery costs
PZFR6R NGK 5758 Spark plug M14 x 1,25, Spanner Size: 16 mm
Parts Details
  • Spanner Size: 16 mm
  • Spark Plug: Platinum Middle Electrode, 1 - Earthed Electrode, Interference Suppression 1 kOhm, with gasket seat, Fixed SAE connector
  • Thread Length [mm]: 19,0
  • Spark Position [mm]: 5,0
  • Thread Size: M14 x 1,25
  • NGK: Spark plug
  • Item number: 5758
  • Condition: New
Details
NGK Spark plug
Article number: 5758
£ 13,74
(Price per item)
price incl. 20% VAT, excl. delivery costs

Common causes and malfunctions:

  • A clogged fuel filter

If the fuel filter gets clogged up by dirt, debris and other contaminants, it’s possible that the engine won’t receive enough fuel. This may result in poor acceleration, misfires, sudden drops in power, and stalling. It’s rare that the blockage stops the engine from starting altogether, but you may find that it takes longer to crank the engine before it starts.

  • A failing fuel pump

The pump needs to be able to produce enough power to force the petrol or diesel through the fuel supply system and into the engine. Sometimes it fails to do so as a result of an electrical fault or excessive wear. An overused car fuel filter can actually cause the pump to fail due to the increased pressure and force needed to push the fuel through it.

Fuel filter

  • Filthy fuel injectors

These components are responsible for injecting the fuel into the combustion chambers, where it is mixed with air and ignited. A precise and extremely high amount of pressure is required to do this on time every time. Disruptions can result in a loss of power and damaged engine pistons.

This is often the result of a buildup of carbon deposits, blocking the injector nozzles. A dirty fuel system or use of poor-quality fuel will ultimately speed up the formation of carbon deposits. You may be able to prevent this from happening again by cleaning out the system using an effective engine and fuel system cleaner.

  • Faulty spark plugs

Spark plugs ignite the fuel, making them critical for the combustion process. Eventually, these parts will wear out, potentially causing misfires, reduced engine performance due to power losses, and knocking or rattling noises. You should replace your spark plugs on time according to the intervals specified by the car manufacturer.

MANN-FILTER WK 731 Fuel filter Spin-on Filter
Parts Details
  • Filter type: Spin-on Filter
  • Height [mm]: 117
  • Diameter [mm]: 76
  • Thread Size: M16x1.5
  • Gasket inner diameter: 62
  • Seal Ring Outer Diameter: 71
  • MANN-FILTER: Fuel filter
  • Item number: WK 731
  • Our price: £ 7,01
  • Condition: New
Details
MANN-FILTER Fuel filter
Article number: WK 731
£ 7,01
price incl. 20% VAT, excl. delivery costs
4702 DENSO Iridium TT IK20TT Spark plug Spanner Size: 16
Parts Details
  • Spanner Size: 16
  • Product line: Iridium TT
  • Spark Plug: 1 - Earthed Electrode, Platinum Middle Electrode
  • Thread Length [mm]: 19
  • Connector type: Solid SAE
  • Tightening Torque [Nm]: 22
  • Diameter [mm]: 14
  • Weight [g]: 43
  • Country Specific Design: Japan
  • Gross Weight [g]: 46
  • DENSO: Spark plug
  • Item number: IK20TT
  • Condition: New
Details
DENSO Spark plug
Article number: IK20TT
£ 11,70
(Price per item)
price incl. 20% VAT, excl. delivery costs
5380 DENSO Iridium Power IWF24 Spark plug Spanner Size: 20.6
Parts Details
  • Spanner Size: 20.6
  • Product line: Iridium Power
  • Spark Plug: 1 - Earthed Electrode
  • Thread Length [mm]: 12,7
  • Connector type: Removable SAE
  • Tightening Torque [Nm]: 22
  • Diameter [mm]: 14
  • Weight [g]: 52
  • for OE number: J4520IWF24
  • Country Specific Design: Japan
  • Gross Weight [g]: 55
  • DENSO: Spark plug
  • Item number: IWF24
  • Condition: New
Details
DENSO Spark plug
Article number: IWF24
£ 12,38
(Price per item)
price incl. 20% VAT, excl. delivery costs
MANN-FILTER PU 825 x Fuel filter with seal
Parts Details
  • Height [mm]: 136
  • Diameter [mm]: 78
  • Inner Diameter [mm]: 12
  • Supplementary Article / Supplementary Info: with seal
  • MANN-FILTER: Fuel filter
  • Item number: PU 825 x
  • Our price: £ 16,53
  • Condition: New
Details
MANN-FILTER Fuel filter
Article number: PU 825 x
£ 16,53
price incl. 20% VAT, excl. delivery costs
PLFER7A8EG NGK 94833 Spark plug M14 x 1,25, Spanner Size: 16 mm
Parts Details
  • Spanner Size: 16 mm
  • Spark Plug: Ring type connector (cup-shaped), Platinum Middle Electrode, 1 - Earthed Electrode, Interference Suppression 1 kOhm, with gasket seat
  • Thread Length [mm]: 26,5
  • Spark Position [mm]: 3,5
  • Thread Size: M14 x 1,25
  • NGK: Spark plug
  • Item number: 94833
  • Condition: New
Details
NGK Spark plug
Article number: 94833
£ 14,46
(Price per item)
price incl. 20% VAT, excl. delivery costs

  • Defective ignition coils

Like the spark plugs, your car can’t produce power without them. They generate and convert the voltage required for the plugs to create a spark. They may fail due to electrical issues, damage or interference.

  • A clogged air filter

The car air filter for the engine traps any foreign particles that may harm the unit, such as dirt and debris. Over time, it reaches its full capacity, preventing air from flowing through it efficiently. Without sufficient oxygen, the combustion process will be affected leading to a reduction in power.

A clogged air filter

  • A camshaft position (CMP) sensor malfunction

The sensor’s readings are key for the ECU to calculate the exact timing of injection and ignition processes. If it goes bad, the engine power may be inconsistent, causing the car to stall, hesitate, or lurch forward under acceleration.

  • A mass airflow (MAF) sensor malfunction

The MAF sensor, otherwise known as the car air flow meter, sends a signal to the ECU indicating how much air is required for acceleration. Based on this information, the unit makes the throttle open up or close to regulate the air flowing into the engine. If it malfunctions, the car may run too rich (too much fuel) or too lean (too much air) causing a reduction in power and fuel efficiency.

Top products related to this topic:

AUTODOC Bestsellers: parts at a good price

ZFR5P-G NGK 6893 Spark plug M14 x 1,25, Spanner Size: 16 mm
Parts Details
  • Spanner Size: 16 mm
  • Spark Plug: Nickel Middle Electrode, 1 - Earthed Electrode, Interference Suppression 1 kOhm, with gasket seat, Fixed SAE connector
  • Thread Length [mm]: 19,0
  • Spark Position [mm]: 7,0
  • Thread Size: M14 x 1,25
  • NGK: Spark plug
  • Item number: 6893
  • Condition: New
Details
NGK Spark plug
Article number: 6893
£ 6,35
(Price per item)
price incl. 20% VAT, excl. delivery costs
ZFR6T-11G NGK 5960 Spark plug M14 x 1,25, Spanner Size: 16 mm
Parts Details
  • Spanner Size: 16 mm
  • Spark Plug: Nickel Middle Electrode, 1 - Earthed Electrode, Interference Suppression 1 kOhm, with gasket seat, Fixed SAE connector
  • Thread Length [mm]: 19,0
  • Spark Position [mm]: 7,0
  • Thread Size: M14 x 1,25
  • NGK: Spark plug
  • Item number: 5960
  • Condition: New
Details
NGK Spark plug
Article number: 5960
£ 6,04
(Price per item)
price incl. 20% VAT, excl. delivery costs
BKR5EK NGK 7956 Spark plug M14 x 1,25, Spanner Size: 16 mm
Parts Details
  • Spanner Size: 16 mm
  • Spark Plug: Nickel Middle Electrode, 2 - Earthed Electrode, Interference Suppression 5 kOhm, with gasket seat, Fixed SAE connector
  • Thread Length [mm]: 19,0
  • Spark Position [mm]: 6,0
  • Thread Size: M14 x 1,25
  • NGK: Spark plug
  • Item number: 7956
  • Condition: New
Details
NGK Spark plug
Article number: 7956
£ 5,40
(Price per item)
price incl. 20% VAT, excl. delivery costs
PLKR7B8E NGK 94716 Spark plug M12 x 1,25, Spanner Size: 16 mm
Parts Details
  • Spanner Size: 16 mm
  • Spark Plug: Platinum Middle Electrode, 1 - Earthed Electrode, Interference Suppression 1 kOhm, with gasket seat, Fixed SAE connector
  • Thread Length [mm]: 26,5
  • Spark Position [mm]: 3,5
  • Thread Size: M12 x 1,25
  • NGK: Spark plug
  • Item number: 94716
  • Condition: New
Details
NGK Spark plug
Article number: 94716
£ 10,57
(Price per item)
price incl. 20% VAT, excl. delivery costs
-46%
BERU UPT3 Spark plug M14x1,25, Spanner Size: 16 mm, Poly-V Tit, ULTRA TITAN
Parts Details
  • Supplementary Info: ULTRA TITAN
  • Electrode Gap [mm]: 0,9
  • Spanner Size: 16 mm
  • Spark Plug: 1 - Earthed Electrode, with gasket seat
  • Quality / Grade: Poly-V Tit
  • Thread Length [mm]: 19
  • Thread Size: M14x1,25
  • Connector type: SAE
  • Tightening torque from [Nm]: 20
  • Tightening torque to [Nm]: 30
  • Resistor from [kOhm]: 1
  • Resistor to [kOhm]: 2
  • BERU: Spark plug
  • Item number: UPT3
  • Condition: New
Details
BERU Spark plug
Article number: UPT3
RRP

RRP is the recommended retail price set by the manufacturer or importer of the product and provided by the manufacturer, supplier or retailer. AUTODOC displays the RRP (VAT incl.) for a product if it has been received from at least one supplier or another source that has such information.

£ 9,40
£ 5,05
(Price per item)
price incl. 20% VAT, excl. delivery costs
MANN-FILTER PU 936/1 x Fuel filter with seal
Parts Details
  • Height [mm]: 116
  • Diameter [mm]: 84
  • Inner Diameter [mm]: 19
  • Supplementary Article / Supplementary Info: with seal
  • MANN-FILTER: Fuel filter
  • Item number: PU 936/1 x
  • Our price: £ 23,43
  • Condition: New
Details
MANN-FILTER Fuel filter
Article number: PU 936/1 x
£ 23,43
price incl. 20% VAT, excl. delivery costs
MANN-FILTER WK 820/14 Fuel filter In-Line Filter, 10mm, 8mm
Parts Details
  • Filter type: In-Line Filter
  • Height [mm]: 100
  • Diameter [mm]: 86
  • Inlet Ø [mm]: 10
  • Outlet Ø [mm]: 8
  • MANN-FILTER: Fuel filter
  • Item number: WK 820/14
  • Our price: £ 64,17
  • Condition: New
Details
MANN-FILTER Fuel filter
Article number: WK 820/14
£ 64,17
price incl. 20% VAT, excl. delivery costs
SIZFR6B8EG NGK 96209 Spark plug M14 x 1,25, Spanner Size: 16 mm
Parts Details
  • Spanner Size: 16 mm
  • Spark Plug: Iridium Middle Electrode, 1 - Earthed Electrode, Interference Suppression 1 kOhm, with gasket seat, Fixed SAE connector
  • Thread Length [mm]: 19,0
  • Spark Position [mm]: 5,0
  • Thread Size: M14 x 1,25
  • NGK: Spark plug
  • Item number: 96209
  • Condition: New
Details
NGK Spark plug
Article number: 96209
£ 12,74
(Price per item)
price incl. 20% VAT, excl. delivery costs
BUR6ET NGK 3172 Spark plug M14 x 1,25, Spanner Size: 20,8 mm
Parts Details
  • Spanner Size: 20,8 mm
  • Spark Plug: Connector Type M4, Nickel Middle Electrode, 3 - Earthed Electrode, Interference Suppression 1 kOhm, with gasket seat
  • Thread Length [mm]: 19,0
  • Spark Position [mm]: 5,2
  • Thread Size: M14 x 1,25
  • NGK: Spark plug
  • Item number: 3172
  • Condition: New
Details
NGK Spark plug
Article number: 3172
£ 6,80
(Price per item)
price incl. 20% VAT, excl. delivery costs
-53%
BERU UPT8 Spark plug M14x1,25, Spanner Size: 21 mm, Poly-V Tit, ULTRA TITAN
Parts Details
  • Supplementary Info: ULTRA TITAN
  • Electrode Gap [mm]: 0,9
  • Spanner Size: 21 mm
  • Spark Plug: 1 - Earthed Electrode, with gasket seat
  • Quality / Grade: Poly-V Tit
  • Thread Length [mm]: 19
  • Thread Size: M14x1,25
  • Connector type: SAE / M4
  • Tightening torque from [Nm]: 20
  • Tightening torque to [Nm]: 30
  • Resistor from [kOhm]: 3
  • Resistor to [kOhm]: 10
  • BERU: Spark plug
  • Item number: UPT8
  • Condition: New
Details
BERU Spark plug
Article number: UPT8
RRP

RRP is the recommended retail price set by the manufacturer or importer of the product and provided by the manufacturer, supplier or retailer. AUTODOC displays the RRP (VAT incl.) for a product if it has been received from at least one supplier or another source that has such information.

£ 10,19
£ 4,78
(Price per item)
price incl. 20% VAT, excl. delivery costs

Popular posts

Subscribe to our newsletters

To get our latest news and tips, please, enter your e-mail: