Engine cylinders misfire when they lack enough spark, fuel, and compression. However, they work when the MDS solenoid sends low or high pressure for the cylinder valve to collapse.
Can a Bad MDS Solenoid Cause a Misfire? A bad MDS solenoid causes a misfire due to reduced fuel flow, malfunctioning PCM, variable octane strain, and malfunctioning valve lifters.
The multi-displacement solenoid (MDS) can affect the performance of engine cylinders because it regulates the pressure for valve opening and closing. As a result, rust, exhaust pipes break, and internal defects can damage it.
Why does a bad MDS Solenoid cause a misfire?
A Malfunctioning MDS solenoid can alter the pressure to regulate the engine cylinders. It can cause misfires due to the following reasons.
Reduced fuel flow
The clogged fuel injectors reduce the fuel flow inside the engine. In addition, the MDS solenoid cannot produce enough fuel pressure.
Sometimes, the cylinders and their valves close. They lose their efficiency when the fuel pressure becomes low.
In such circumstances, they stop performance. They lose functionality, and valves do not collapse.
As a result, they undergo misfiring. They cannot perform at the standard level. It changes the combustions ratio.
The fuel does not mix with the air properly. Therefore, they fail and do not support the vehicle.
It can reduce truck power and speed. However, reduced fuel flow is dangerous for injectors and combustion chambers.
The motor malfunctions and loses the power for proper strokes. They alter combustion and directly affect the truck speed.
Also, you can change acceleration according to your requirement.
The Powertrain control module regulates the fuel flow toward the fuel injectors and cylinders of the engine. However, electrical defects can damage the Powertrain control module.
Malfunctioning PCM causes the misfiring of cylinder 5. However, you can reset the PCM and remove the problem.
Sometimes, the malfunctioning and defective Powertrain control module reduces the stroke power. As a result, it causes a misfire in cylinder 6.
The defective PCM changes the flow of fuel in the injector system. Also, it increases the temperature of the engine.
The stroke and combustion reduce, and it cannot mix fuel with air at the proper rate. The unburn air and modified air and fuel ratio can cause engine misfiring.
Moreover, the malfunctioning PCM cannot stabilize the combustions because internal failures damage it.
The damaged vehicle module or computer can change fuel usage. This is because the injectors cannot follow the electrical signals properly.
Also, the Powertrain control module cannot send electrical signals to the motor.
Variable octane strain
A few people use low-octane gas in their pickup trucks. The gas with low octane has low resistance to heat.
However, low-octane gas or old gas can cause the misfire of cylinders. This is because the wrong gas has a low octane level. The dirty gas can damage the injectors.
Also, the injectors cannot send fuel pressure to these chambers. Therefore, they lack the power for strokes and combustions.
The clogged fuel filter and injectors can cause their misfires. In addition, the engine undergoes excessive misfiring when they lack compression.
They lose the spark and fuel flow. The misfire can include 3 to 4 cylinders.
The spark plugs lose their efficiency. Furthermore, the ignition coil breaks and causes misfires.
You can remove this fault by adding high-octane gas and stabilizing the engine performance. The high-octane gas can stabilize the performance of combustion chambers.
Also, it can increase motor efficiency. The vehicle speed enhances, and you can start it with maximum power.
It can improve the power of strokes and ignition, and you can drive the vehicle smoothly.
Malfunctioning valve lifters
The multi-displacement system solenoid causes the collapsing of cylinder lifters. Therefore, the MDS solenoid damages and reduces the performance of valve lifters.
Their modified efficiency decreases the mixing of air with fuel. These chambers carry out proper combustion.
Air does not mix with fuel and causes misfiring of the cylinder. In addition, the reduced combustions decrease the strokes, and they cannot perform at the standard level.
In such circumstances, the speed of the vehicle changes, and you can identify reduced acceleration. The lifter can damage and stops the movement of valves.
The engine performance changes, and driving becomes rough. Moreover, the engine misfires, and you cannot restart the vehicle.
The valve lifters are hydraulic and undergo several surface and internal damages. The valve top cover and rod break.
Also, the engine produces loud sounds when the valve lifters malfunction. In such circumstances, the engine combustion chambers fail and do not mix the fuel with air at the standard level.
The valve lifters do not move upwards and downward. Therefore, reduced pressure of fuel affects their performance.
They can damage and stick in one position. In addition, it changes the combustion and decreases horsepower.
It affects overall vehicle efficiency, acceleration, and other components.
Which cylinders misfire when MDS Solenoid goes bad?
MDS solenoid malfunctions and affects the cylinder performance. It causes their misfires, but all cylinders do not undergo misfiring.
A few of them malfunction and loses their efficiency. The low-octane gas can damage the multi-displacement solenoid.
In such circumstances, the fuel injectors do not function properly. As a result, cylinders 4, 1, and 6 undergo misfiring.
The engine cylinder number 7 can misfire. Furthermore, they can stroke power.
They cannot perform proper combustion. In such circumstances, the air does not mix with the fuel.
The cylinder misfiring becomes common when the crankshaft completes the rotations. Also, the V8 engines are high-performance motors.
They can consume excessive fuel and power. The V8 misfires when the MDS solenoid breaks down or fails.
The fuel injector malfunctions and collapses of valves vary.
How to fix a misfire caused by a bad MDS Solenoid?
You can fix the misfiring of different engine cylinders by replacing the bad MDS solenoid. However, you can change it with or without professional assistance.
You can check the malfunctioning MDS solenoid. You can remove the old and damaged harness from the system.
Then, you can alter and stabilize the power flow. You can remove the intake manifold from the vehicle.
However, you can disconnect it like the electrical wires. You can remove the vacuum passages from the connection point.
You can adjust a wrench over the fasteners. These fasteners hold the intake manifold in a specific position.
Furthermore, they prevent sudden failures. The intake manifold remains in a specific position when the fasteners are in their mounting place.
Then, you can find the multi-displacement system solenoid. You can hold the connected cord and remove it from the connection spot.
Also, you can attach a multimeter with it and check the voltage flow. A voltage lowers than 4 to 6 ohms indicates damage to the solenoid.
It cannot perform at the standard level. However, you can swap it according to the following instructions.
However, you can remove the terminals and cords of the battery. Then, you can pull the intake manifold and remove it.
You can approach the insulator and remove it. Also, you can pull the wiring harness and remove it from the system.
You can adjust a screwdriver or bolt puller on its bolt. For example, you can rotate the bolt anti-clockwise and remove it.
It can loosen it from the connection spot. Then, you can pull it and remove it from the system.
Now, you can re-install the new solenoid and re-attach the harness. You can install all the connectors and cords and stabilize the system.
Troubleshooting the cylinders is another way to fix their misfiring. Also, you can connect a multimeter with the motor and valves and their lifters.
You can check and identify all the faults and codes. You can remove the damaged lifters and injectors.
Also, you can remove the clogging of injectors and clean them. It can stabilize the performance of multi-displacement system solenoids.
Then, it can stabilize the fuel flow toward the combustion chambers and protect them from misfiring.