Fuel System Parts - Fuel Injection

AIR Charge Temp Sensor
Replaces: Mercruiser 805223T, Volvo 3854527
Fits: Mercruiser / Volvo 4.3L, 5.0L

The Air Charge Temperature Sensor (ACTS) a thermistor sensor that inputs the temperature of the incoming air stream in the air filter or intake manifold to the computer. It can be located in the intake manifold (EFI systems) or the air cleaner.

AIR Charge Temp Sensor
Replaces: OMC / Volvo 3854158
Fits: Ford 5.0L & 5.8L 1993

The Air Charge Temperature Sensor (ACTS) a thermistor sensor that inputs the temperature of the incoming air stream in the air filter or intake manifold to the computer. It can be located in the intake manifold (EFI systems) or the air cleaner.

Coolant Temp Sensor
Replaces: Mercruiser 805218T / Volvo 3850397
Fits: Used with Temp Gauge MCM/MIE EFI Models
  
The coolant temperature sensor is used to measure the temperature of the engine coolant of an internal combustion engine. The readings from this sensor are then fed back to the Engine control unit (ECU). This data from the sensor is then used to adjust the fuel injection and ignition timing.

Coolant Temp Sensor
Replaces: OMC / Volvo 3854159
Fits: Ford 5.0L & 5.8L 1993

The coolant temperature sensor is used to measure the temperature of the engine coolant of an internal combustion engine. The readings from this sensor are then fed back to the Engine control unit (ECU). This data from the sensor is then used to adjust the fuel injection and ignition timing.

IAC Motor
Replaces: Mercuiser 805224A1
Fits: MCM / MIE GM V6 & 305,350,454,502 EFI

An IAC (idle air control) motor is designed to adjust the engine idle RPM speed by opening and closing an air bypass passage inside the throttle body. The PCM (powertrain control module) receives information from various sensors and will output signals to adjust the idle air control motor in or out to adjust engine idle speed by controlling engine idle air.

IAC Motor
Replaces: Volvo / OMC 3855194
Fits: Volvo / OMC 4.3L,5.0L,5.7L,7..4L & 8.1L

An IAC (idle air control) motor is designed to adjust the engine idle RPM speed by opening and closing an air bypass passage inside the throttle body. The PCM (powertrain control module) receives information from various sensors and will output signals to adjust the idle air control motor in or out to adjust engine idle speed by controlling engine idle air.

Additional Details:

• Fits: MCM/MIE GM V-8 (305, 350 & 377 CID) Engines

Interchanges/Replaces

Mallory

• 9-33503

Mercruiser Stern Drive

• 806612T

OMC Stern Drive

• 3850357

Pleasurecraft

• R020027

Volvo Penta

• 22024631
• 3850357

Knock Sensor
Replaces: Mercruiser 805544T / Volvo 3854512
Fits: MCM/MIE GM V8 454, 502, 540, 572

These Mallory Marine ignition knock sensors maximize your engine's performance--regardless of fuel quality! The knock sensors hear various knock frequencies under many operating conditions to detect shifts and provide an accurate signal to your engine control module. The sensors meet or exceed OE requirements and reduce potential damage to your internal engine components

MAP Sensor
Replaces: Mercruiser 854445
Fits: MCM 525 EFI

Malfunctioning MAP sensors can often cause problems, such as an intermittent check engine light, hesitation when accelerating, elevated emissions, and even poor engine performance. So, if yours is in need of replacement, do it with Mallory Marine MAP sensors. These MAP sensors provide precise measurements of manifold absolute pressure. They are designed to perform in harsh environments, such as extreme temperatures, vibration, thermal and mechanical shock, and chemical contamination. Safeguard your engine with these quality MAP sensor components.

MAP Sensor
Replaces: Mercruiser 864856A1 / Volvo 3850396
Fits: MCM/MIE GM V6 & 350,377,454,502 EFI

Malfunctioning MAP sensors can often cause problems, such as an intermittent check engine light, hesitation when accelerating, elevated emissions, and even poor engine performance. So, if yours is in need of replacement, do it with Mallory Marine MAP sensors. These MAP sensors provide precise measurements of manifold absolute pressure. They are designed to perform in harsh environments, such as extreme temperatures, vibration, thermal and mechanical shock, and chemical contamination. Safeguard your engine with these quality MAP sensor components.

MAP Sensor
Replaces: Mercruiser 881731
Fits: MCM 496 Mag & 8.1L

Malfunctioning MAP sensors can often cause problems, such as an intermittent check engine light, hesitation when accelerating, elevated emissions, and even poor engine performance. So, if yours is in need of replacement, do it with Mallory Marine MAP sensors. These MAP sensors provide precise measurements of manifold absolute pressure. They are designed to perform in harsh environments, such as extreme temperatures, vibration, thermal and mechanical shock, and chemical contamination. Safeguard your engine with these quality MAP sensor components.

O2 Spacer, For Common Log Style Exhaust manifolds

This Unique 1" thick adapter plate provides an installation option for retro fitting a Oxygen sensor and or air fuel ratio gauge for tuning purposes Into the most common Log Manifold style exhaust systems. The part is manufactured from Aluminum and is not treated with any corrosion resistance. Designed to accept popular 18MM O2 Oxygen sensors.

TECH NOTE: Will O2 Sensors Work In marine exhaust systems?

YES FOR TUNING but they have limitations as water / moisture is a byproduct of combustion. Often boaters find there is moisture in their exhaust system that have collected or made their way inside of what is better known as the "DRY" exhaust stream of their exhaust system. Anything from steam like to little water droplets about 1/32" all around the inside of the exhaust. This is because water IS a by product of combustion. same thing you see on a cold morning behind cars. sometimes you see water dripping out.

Don't take our word for it ask a real rocket scientist: https://www.grc.nasa.gov/www/k-12/airplane/combst1.html

This is why O2 Sensors are great for tuning but have a limited long term life span unless protected by Catalytic converters like on New Marine engine offerings. So you know gas is known as a hydrocarbon based fuel. And we all know what hydro means WATER.

• For Log Manifolds 
• 5" Outside Diameter 
• 3" Inside Diameter 
• 1" Thick
• 18MM O2 hole
• 2-15/16" Bolt Hole to Bolt Hole (Adjacent)
• 4-1/8" Bolt Hole to Bolt Hole (Across)
• Mounting Hardware is NOT INCLUDED
• Riser Gaskets sold separately (500-718) 2 Required
• Stainless Steel 18MM Oxygen Sensor Plug sold separately (620-50031) 1 Required
• Sold Each

O2 Spacer Stainless Steel, For Stock Mercury Exhaust with Wet Joint Riser

This Unique 1" thick adapter plate provides an installation option for retro fitting a Oxygen sensor and or air fuel ratio gauge for tuning purposes Into Mercruiser's most common Wet Joint style exhaust manifold systems. The part is CNC machined from 316L Stainless Steel providing longevity and corrosion resistance unmatched by an Aluminum product.

A unique feature of this adapter is the cooling parts that run along each side of the sensor maintaining consistent temperature of the spacer. Designed to accept all popular 18MM O2 Oxygen sensors.

• Mercury 3 and 4" Riser Gasket(700-32080) 2 Required
• Stainless Steel 18MM Oxygen Sensor Plug(620-50031) 1 Required

TECH NOTE: O2 sensors and plugs must always apply Anti Seize to all threads to avoid galling  
TECH NOTE: Will O2 Sensors Work In marine exhaust systems?

YES FOR TUNING but they have limitations as water / moisture is a byproduct of combustion. Often boaters find there is moisture in their exhaust system that have collected or made their way inside of what is better known as the "DRY" exhaust stream of their exhaust system. Anything from steam like to little water droplets about 1/32" all around the inside of the exhaust. This is because water IS a by product of combustion. same thing you see on a cold morning behind cars. sometimes you see water dripping out.

Don't take our word for it ask a real rocket scientist: https://www.grc.nasa.gov/www/k-12/airplane/combst1.html

This is why O2 Sensors are great for tuning but have a limited long term life span unless protected by Catalytic converters like on New Marine engine offerings. So you know gas is known as a hydrocarbon based fuel. And we all know what hydro means WATER.

Stainless Steel 18MM Oxygen Sensor Plug

This plug only is designed fit popular O2 bungs and ports designed to allow you to cap/plug a oxygen sensor bung  Price does not include bung only plug. Sold Each. 18mm x 1.5

Stainless Steel 18MM Oxygen Sensor Plug - Hex Head

This plug only is designed fit popular O2 bungs and ports designed to allow you to cap/plug a oxygen sensor bung  Price does not include bung only plug. Sold Each. 18mm x 1.5, Hex Head.

• For Log Manifold O2 spacer 620-32435 
• Includes 4 studs, 4  washers, and 4 nuts, all 5/16"
  

Key Features:

• Sender Code "D"

Additional Details:

• Thread Size: 1/8-27
• Range: 239°

Interchanges/Replaces

Mallory

• 9-33850

Volvo Penta

• 3862500

Interchanges/Replaces

Mallory

• 9-42407

Volvo Penta

• 872066

Throttle Position Sensor
Replaces: Mercruiser 803148 / Volvo 3855296
Fits: MCM / MIE 350 Mag, Blk Scorpion Ski (0L005900 & up)

A throttle position sensor (TPS) is a sensor used to monitor the position of the throttle in an internal combustion engine. The sensor is usually located on the butterfly spindle so that it can directly monitor the position of the throttle.

Throttle Position Sensor
Replaces: Mercruiser 805226A1 / Volvo 3855184
Fits: MCM / MIE V6 & 305, 350, 454, 502 EFI

A throttle position sensor (TPS) is a sensor used to monitor the position of the throttle in an internal combustion engine. The sensor is usually located on the butterfly spindle so that it can directly monitor the position of the throttle.