MDS is a multi-displacement system with several solenoids that are cylindrical wire coils and carries electrical voltage. It is in 5.7 and 6.4 HEMI modern engines and was launched in 2006.
How to Tell If MDS Solenoid is Bad? You can tell if the MDS solenoid is bad by engine noises, codes, variable speed, modified power flow, decreased fuel economy, vibrations during ignition, and intermittent circuit performance.
MDS solenoid supplies oil to lifters of engine cylinders, and oil flows to the locking pins, and lifters collapse. The valves close, and the Powertrain control module shuts off. It stops fuel flow toward the cylinder and improves the vehicle’s gas mileage.
What are the symptoms of bad MDS Solenoid?
The failure of a multi-displacement system solenoid can increase the number of emissions. I have explained the symptoms of bds MDS solenoid.
Codes and variable speed
One of the common signs of a malfunctioning multi-displacement system solenoid is warning codes. The Powertrain control module identifies the malfunctioning MDS solenoid and triggers various codes on the dashboard.
P3425 shows the malfunctioning of its circuit. It indicates the deactivation of cylinder 4 of the motor.
Also, this code determines the reduced performance of the circuit. However, it cannot regulate the cylinder performance for engine stability.
It malfunctions and triggers P308 to show the malfunctioning of cylinder 8. You can identify P301 diagnostic trouble code during its malfunctioning.
All of these codes indicate the damages and defects of the multi-displacement system solenoid. Furthermore, it can close a few cylinders which reduces fuel consumption.
In addition, it reduces the motor load and pressure, which increases its efficiency. It provides steady acceleration.
But, it cannot stabilize the speed and motor pressure when it undergoes damage. In such circumstances, the speed decreases and shows its failure.
The faulty or malfunctioning multi-displacement system solenoid can reduce engine efficiency. Its primary sign is continuous ticking sounds from the motor.
It indicates the problem with the lifters of the motor cylinders. As a result, the motor idles, and components produce ticking sounds.
You can hear these noises near the hood and inside the cabin. These are loud sounds that indicate its defects.
The valves and their lifters produce these sounds continuously when they lose their performance.
Modified power flow
The Powertrain control module regulates the electric power flow toward the MDS solenoid. The multi-displacement system solenoid malfunctions and affects the PCM performance.
Also, the Powertrain control module cannot send specific electric signals. As a result, the PCM cannot regulate its fuel pressure.
The Powertrain control module cannot regulate its movement on cylinder number seven of the motor. In such circumstances, the cylinder loses performance and triggers a diagnostic trouble code.
The malfunctioning PCM modifies the power flow. In addition, the variable voltages alter the lifter pressure on the engine valves.
The valves do not close due to internal and surface defects. However, their low performance is a significant symptom of the malfunctioning solenoid.
Fuel economy decreases
The standard function of a multi-displacement solenoid is to close the engine cylinders to reduce fuel consumption. However, it malfunctions and cannot stabilize the fuel economy.
The cylinders do not close, and fuel consumption increases. Therefore, it decreases the standard fuel economy of the pickup truck.
The open cylinders cause more fuel usage. It increases fuel consumption which leads to more emissions of dangerous vapors.
T fuel economy reduces beyond the limits, which affects acceleration and leads to various refills. The low fuel economy is a symptom of its malfunctioning.
Vibrations during ignition
The engine vibrates when you start it while the multi-displacement solenoid malfunctions. You cannot start the truck without vibrations when it fails.
Also, you can identify jerks and stall during the ignition. This is because the sputtering of the vehicle motor increases when you increase the pressure on the gas pedal.
The engine cannot provide high acceleration when it malfunctions. Excessive vibrations and challenging ignition consume time.
Moreover, the motor utilizes more fuel during these procedures. In such circumstances, the gas level decreases from the tank.
Low fuel levels can decrease the performance of built-in exhaust. The exhaust components break and undergo various failures, which increases the number of emissions vapors.
Vibrations at the ignition indicate the defects of the multi-displacement system solenoid.
Intermittent circuit performance
The MDS solenoid damages and affects the performance of the engine and module. The multi-displacement system performs intermittently.
The power flow varies inside the system. First, the system turns on for a few minutes. Then, the power flow reduces, and it turns off.
Its intermittent performance shows its malfunctioning, damages, and failures. Also, the power flow becomes intermittent when the cylinders do not open or close properly.
How to fix if MDS Solenoid is bad?
The MDS Solenoid malfunctions and alters the opening and closing of cylinders and connected engine valves. However, you can access various warning codes which indicate its problems.
Low fuel economy and variable speed are primary signs of its defects. However, you can fix the problems by resetting the truck Powertrain control module.
You can stabilize its power flow and remove the diagnostic trouble codes. Replacing it can remove motor vibrations and stabilize the movement of cylinder lifters.
You can remove the multi-displacement system lifters from the engine and replace them with non-multi-displacement system lifters.
Moreover, you can check the lifters and remove corrosion and debris from their surroundings. The combustion cylinder lifters are the best choice to regulate their movement.
They can collapse without stable fuel pressure. You can stabilize the exhaust performance. You can check its defects and leaks.
You can add sealing material to the leaking holes. However, you can clean the exhaust with a soft cloth or a brush.
Then, you can install the heat wrap on the leaks. You can reduce the number of vibrations by providing a stable power flow inside the circuit.
You can check the connecting wires and tighten them with their mounts. Also, you can change the broken wires for stable power flow.
Its intermittent performance changes and reduces vibrations. You can turn off the PCM and reset its programming to stabilize its performance.
However, its reset takes a few minutes. Then, it can send specific pressure signals to the valves and cylinders.
They can close according to the input electric power signals. It increases mileage and fuel efficiency.
Low fuel consumption improves fuel economy. In addition, it keeps the engine safe and protects it from mechanical and electrical damage.
Is it dangerous to drive if MDS Solenoid is bad?
Many people drive their cars when the MDS solenoid malfunctions in the 6.4 and 5.7 HEMI engines. Its location determines the type and severity of danger.
The MDS solenoid is underneath the intake manifold of a vehicle. It controls the mixing of air with fuel.
A malfunctioning solenoid of the multi-displacement system cannot control the air and fuel mixing. As a result, the fuel-air ratio changes to alter the vehicle speed and motor performance.
You cannot cover several miles when it malfunctions. Moreover, it can damage the built-in catalytic converters due to internal defects.
The malfunctioning catalytic converter cannot regulate emissions. As a result, the excessive emission of dangerous gases increases fuel consumption.
It can reduce the fuel level in the tank, which stops the vehicle suddenly. The engine undergoes damage and failures when the fuel level decreases.
The motor undergoes drying, and friction increases. As a result, the frictional damages become significant, and the motor stops.
Power failures and variable speeds are significant symptoms of MDS solenoid defects. The engine power decreases, and you cannot drive the vehicle at steady acceleration.
Then, the motor undergoes catastrophic performance failures, which reduce driving comfort. Continuous low fuel economy is dangerous because the engine vibrates and stops.
The sudden engine failure causes collisions and injuries.