The situation when Mitsubishi Galant The eighth generation refuses to start, often taking the owner by surprise. This car, especially equipped with series engines GDI, requires careful attention to the fuel system and electrics. There can be many reasons: from a simply discharged battery to a complex malfunction in the engine control unit.
Before you panic and call a tow truck, you need to carry out an initial diagnosis. The pattern of rotation of the starter and the behavior of the warning lights on the dashboard will tell you more about the problem than any guesswork. In this article, we will look at the main startup failure scenarios and how to resolve them.
It is important to understand that Galant 8 - a technically complex machine for its time. The direct fuel injection system creates high pressure, and the electronics are sensitive to the quality of the contacts. The critical point for GDI engines is the pressure in the fuel rail: if it is below 3.5 MPa, starting will be impossible even with working spark plugs. Let's look at everything in order.
Analysis of starter and battery behavior
The first thing to do is listen to the sounds that the car makes when you turn the key in the ignition. If the starter is silent or only occasional relay clicks are heard, the problem lies in the power circuit. A weak battery is the most common cause of problems, but not the only one.
If the starter turns the crankshaft too slowly (“at half strength”), the engine will not be able to create the necessary compression to ignite the mixture. This is especially true for motors 4G93 and 4G64, which require high rotation speed for a confident start. Check the battery terminals: oxidation of the contacts often leads to loss of current.
If the starter works vigorously, but the engine does not catch, it means that the mechanical part and the battery are working properly. In this case, the circle of suspects narrows down to the fuel supply and spark generation systems. Do not ignore the indication on the dashboard: if the lamp Check Engine does not light up when the ignition is turned on, the ECU or crankshaft position sensor may not be working.
- 🔋 Check the voltage at the battery terminals: it should be at least 12.5 V.
- 🔌 Inspect the “mass” of the engine: the wire from the body to the motor often oxidizes.
- 🔊 Pay attention to the sound of the fuel pump: it should hum for 2-3 seconds after turning on the ignition.
Problems with the GDI fuel system
Engines GDI (Gasoline Direct Injection) are known for their efficiency, but they are extremely demanding on the quality of the fuel and the condition of the high-pressure pump. If the car has been parked for a long time or you refuel at a questionable gas station, starting problems are almost guaranteed.
The main difficulty is that in order to start, the injectors must spray fuel under enormous pressure. If the fuel filter is clogged and the fuel pump mesh in the tank is dirty, the pressure in the rail will not rise to the required values. In such cases, the engine may “catch”, but immediately stall.
⚠️ Attention: Attempting to start a GDI engine “from a pusher” or in tow is strictly not recommended. This can lead to failure of the catalyst and damage to the piston group due to the ingress of unburned fuel.
Often, owners are faced with a malfunction of the fuel pressure regulator. It may stick, releasing pressure back into the tank. It is also worth checking the operation of the fuel pump itself in the tank. If it hums quietly or intermittently, its life is coming to an end.
For GDI engines, use only high-quality gasoline AI-95 or AI-98. Using additives to clean the injector into the tank is not always effective; it is better to diagnose the pressure with a pressure gauge.
Ignition system: spark plugs, coils and timing
Lack of spark is the second most common cause of starting failure. On Mitsubishi Galant 8 Individual ignition coils are installed (for each cylinder). They are reliable, but tend to fail, especially when exposed to moisture or breakdown of insulation.
Spark plugs for engines 4G93 GDI have a specific clearance and heat rating. Using the wrong spark plugs will result in misfires. A visual inspection can tell a lot: if the spark plugs are wet and smell like gasoline, it means fuel is being supplied but not ignited.
It is important to check the condition of the high-voltage wires (if your modification has them) and the coil tips. Cracks in the rubber seals allow moisture to get inside, causing a ground fault. In wet weather, this becomes the main cause of tripping and startup failure.
How to test spark safely?
Unscrew the spark plug, put the coil tip on it and press it with the thread to the engine ground. When cranking the starter, a bright blue spark should appear. Do not hold the candle with your hands while checking!
Sensors and electronic engine control
A modern car will not start without correct signals from the sensors. For Galant 8 Two elements are critical: the crankshaft position (CKP) sensor and the camshaft position (CMP) sensor. Without a signal from CKP, the ECU simply does not know when to supply spark and fuel.
Often the problem lies not in the sensor itself, but in its connector or wiring. Vibration and heat cause loose contacts. It is also worth paying attention to the coolant temperature sensor. If it sends an incorrect signal about "overheating" or "death" of the engine, the ECU may block starting or supply too little fuel.
The engine control unit (ECU) on these models is located in the engine compartment and sometimes suffers from water ingress or contact oxidation. Checking the fuses responsible for powering the injector and pump is also required. Burnt fuse IGN or FUEL will de-energize the entire system.
| Sensor/Element | Problem Symptom | Probability of failure |
|---|---|---|
| Crankshaft sensor (CKP) | The starter turns, but there is no spark | High |
| Camshaft sensor (CMP) | Long startup, unstable operation | Average |
| Idle speed control | Stalls immediately after starting | High |
| Temperature sensor | Difficulty starting "hot" or "cold" | Average |
If the scanner does not see the ECU, first check the power supply to the control unit and the integrity of the EFI fuses.
Mechanical reasons and compression
If the electrical and fuel are in order, it is worth thinking about the mechanical part. Jumping the timing belt by one or two teeth can throw off the valve timing. The engine will run unstably or won't start at all. On motors 4G63/64 this happens when the tensioner breaks or is severely weakened.
Low compression is another enemy of starting. Worn piston rings or burned out valves result in the mixture not being compressed to the desired state. For diesel versions 4D68 low compression is more critical than for gasoline engines, since ignition occurs from compression.
Also worth mentioning is the EGR system. If the EGR valve is stuck open, the engine will choke on its own gases when starting. Cleaning or silencing (for older cars) may solve the problem.
☑️ Mechanical diagnostics
Specifics of launching in winter
Winter is a difficult time for Mitsubishi Galant. Thick engine oil and frozen grease in the starter gearbox increase the load on the battery. GDI engines are especially sensitive to cold starts due to the nature of their mixture formation.
In cold weather, the condition of the spark plugs and battery charge are important. If the car does not start the first time, do not turn the starter endlessly. Let the battery recover, wait a minute. Frequent attempts can “flood” the candles, and then drying or calcination will become inevitable.
Use preheaters or at least keep the car in a warm garage. For engines with direct injection, it is critical that the pump operates at maximum performance during the first seconds of operation, which is impossible if the battery is dead.
⚠️ Attention: Do not use “lighting” from a running car with the engine running on modern cars with complex electronics if you are not sure of the quality of the wires. Power surges can kill the ECU.
Algorithm of actions in case of startup failure
To avoid guessing from the tea leaves, act systematically. First rule out simple causes: fuel, battery charge, fuses. Then proceed to checking the spark and pressure in the rail. Only after this is it worth venturing into the jungle of electronics.
Have a minimum set of tools on hand: a multimeter, a spark plug wrench, a fuel pressure gauge. Often the problem is solved by replacing a cheap sensor or cleaning the contacts in 15 minutes, instead of expensive repairs at a service station.
If self-diagnosis does not produce results, and the car is “dead weight”, it is better to use the services of professionals with a diagnostic scanner. Errors stored in the ECU memory will indicate the direction of the search much faster than searching through options.
OBD-II Error Codes
Reading codes through the connector under the steering wheel (pins 4 and 12 or 1 and 3) by flashing the Check Engine light can indicate a specific faulty component, such as P0300 (misfire) or P0087 (low fuel pressure).
Frequently asked questions (FAQ)
Why does Galant 8 start and immediately stall?
Most often, this indicates a malfunction of the idle air regulator, unaccounted air leaking through cracks in the intake manifold, or low fuel pressure that drops immediately after the pump stops.
Is it possible to drive a Galant 8 if the engine has trouble?
For a short time - yes, to get to the service. But driving for a long time with the cylinder not working will kill the catalyst and can lead to burnout of the valves or piston due to oil being washed away by gasoline from the cylinder walls.
What kind of gasoline is better to pour into the 4G93 GDI?
The manufacturer recommends AI-95. Using AI-92 is possible, but the ECU will adjust the ignition timing, which will reduce power and increase consumption. AI-98 is acceptable, but not required for atmospheric versions.
Where is the main fuel pump fuse located?
It is usually located in the mounting block under the hood (near the battery) and is designated as FUEL or MFI. See the inside of the fuse box cover for the exact diagram.